Paula J. Dempsey

Glenn Research Center, Cleveland, Ohio

Daniel R. Wade

U.S. Army Aviation Engineering Directorate, Redstone Arsenal, Alabama

Lance J. Antolick and Josiah Thomas

RMCI, Inc., Huntsville, Alabama

Investigation of Spiral Bevel Gear Condition 

Indicator Validation Via AC–29–2C Using 

Fielded Rotorcraft HUMS Data

NASA/TM—2014-218406

November 2014

Distribution statement A. Approved for public release per AMRDEC PAO Control Number PR1058.
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Paula J. Dempsey

Glenn Research Center, Cleveland, Ohio

Daniel R. Wade

U.S. Army Aviation Engineering Directorate, Redstone Arsenal, Alabama

Lance J. Antolick and Josiah Thomas

RMCI, Inc., Huntsville, Alabama

Investigation of Spiral Bevel Gear Condition 

Indicator Validation Via AC–29–2C Using 

Fielded Rotorcraft HUMS Data

NASA/TM—2014-218406

November 2014

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Investigation of Spiral Bevel Gear Condition Indicator Validation 

Via AC–29–2C Using Fielded Rotorcraft HUMS Data 

Paula J. Dempsey 

National Aeronautics and Space Administration 

Glenn Research Center 

Cleveland, Ohio 44135 

Daniel R. Wade 

U.S. Army Aviation Engineering Directorate 

Redstone Arsenal, Alabama 35898 

Lance J. Antolick and Josiah Thomas 

RMCI, Inc. 

Huntsville, Alabama 35806 

Executive Summary 

This report documents work performed under a NASA Space Act Agreement (SAA) with the Federal 

Aviation Administration (FAA). The purpose of this work was to support validation and demonstration of 

rotorcraft Health and Usage Monitoring Systems (HUMS) for maintenance credits via “FAA Advisory 

Circular (AC) 29–2C, Section MG–15, Airworthiness Approval of Rotorcraft (HUMS)” (Ref. 1). The 

overarching goal of this work was to determine a method to validate condition indicators in the lab that 

better represent their response to faults in the field. 

This report presents the analysis of gear condition indicator data collected on a helicopter when 

damage occurred in spiral bevel gears. The purpose of the data analysis was to use existing in-service 

helicopter HUMS flight data from faulted spiral bevel gears as a “Case Study,” to better understand the 

differences between HUMS data response in a helicopter and a component test rig, the NASA Glenn 

Spiral Bevel Gear Fatigue Rig. The reason spiral bevel gear sets were chosen to demonstrate differences 

in response between both systems was the availability of the helicopter data and the availability of a test 

rig that was capable of testing spiral bevel gear sets to failure. 

Based on this availability, a plan was put in place to design, fabricate and test comparable gear sets 

with comparable failure modes within the constraints of the test rig. The research objectives of the rig 

tests were to evaluate the capability of detecting gear surface pitting fatigue and other generated failure 

modes on spiral bevel gear teeth using gear condition indicators currently used in fielded HUMS. Results 

of this analysis were published in NASA Technical Memorandum NASA/TM—2014-218384 entitled, 

“Investigation of Spiral Bevel Gear Condition Indicator Validation via AC–29–2C Using Test Rig 

Damage Progression Test Data.” The objective of the analysis presented in this paper was to reprocess 

helicopter HUMS data with the same analysis techniques applied to the spiral bevel rig test data. The 

damage modes experienced in the field were mapped to the failure modes created in the test rig. 

A total of 40 helicopters were evaluated. Twenty helicopters, or tails, experienced damage to the 

spiral bevel gears in the nose gearbox. Vibration based gear condition indicators data was available before 

and after replacement. The other 20 tails had no known anomalies in the nose gearbox within the time 

frame of the datasets. These 20 tails were considered the baseline dataset. 

Using tear down analysis (TDA) reports provided by the U.S. Army, the failure modes observed on 

the gear teeth and other components were summarized into a table and identified based on component 

NASA/TM—2014-218406 iii 
(gear or pinion) and type of damage. Some of the TDA reports were subjective with limited photographs. 

In some cases, other components, such as bearings and splines, were also noted as damaged. 

The HUMS gear condition indicators evaluated included gear condition indicators (CI) Figure of 

Merit 4 (FM4), Root Mean Square (RMS) or Diagnostic Algorithm 1 (DA1) and r 3 Sideband Index 

(SI3). Three additional condition indicators, not currently calculated onboard, were calculated from the 

archived data. These three indicators were r 1 Sideband Index (SI1), the DA1 of the difference signal 

(DiffDA1) and the peak-to-peak of the difference signal (DP2P). 

These six condition indicators were plotted per acquisition and date while the helicopter was in the 

flat pitch ground (FPG101) regime. If the data was available, these six gear condition indicators were also 

plotted per date while the helicopter was in the 120 knots true airspeed (120KTA) regime. The CI data 

from the 20 tails without damage was not individually plotted. Instead, histograms of the CI data from all 

20 tails and a matrix comparing all six CIs were plotted for the pinion and the gear at the two regimes. 

Statistical tables of means and standard deviations were calculated before and after replacement for the 

helicopter with the damaged gears. A correlation matrix was also generated for the entire dataset showing 

the linear relationship between the CIs to damage state for the two regimes 

Results found the CI DP2P, not currently available in the onboard HUMS, performed the best, 

responding to varying levels of damage on thirteen of the fourteen helicopters evaluated. Two additional 

CIs also not in the onboard system, DiffDA1and SI1, also performed well responding to 12 and 10 of the 

14 helicopters evaluated, respectively. Of the three CIs currently available in the MSPU, DA1, FM4 and 

SI3, SI3, responded to eight, DA1 responded to six and FM4 responded to four of the 14 helicopters 

evaluated. FM4, the poorest performing CI, was not as responsive to damage as the other five CIs. 

Conversely, when compared to the other two, it was the only CI that responded to damage on two 

helicopters. 

CI response could not be correlated to specific failure modes due to limited pictures and subjective 

descriptions found within the TDA. Flight regime did affect CI response to some gear faults. Due to the 

range of operating conditions for each regime, more studies are required to determine their sensitivity to 

regimes. 

This is the second of three final reports published on the results of this project. In the third report, 

results from the rig and helicopter data analysis will be compared for differences and similarities in CI 

response. Observations, findings and lessons learned using subscale rig failure progression tests to 

validate helicopter gear condition indicators will be presented. 

NASA/TM—2014-218406 iv 
Contents

Executive Summary ..................................................................................................................................... iii

Acronyms ...................................................................................................................................................... 1

1.0 Background ......................................................................................................................................... 1

2.0 Objectives and Approach .................................................................................................................... 3

3.0 Gearbox Description ........................................................................................................................... 3

4.0 Instrumentation and Data Acquisition................................................................................................. 4

5.0 Failure Modes...................................................................................................................................... 4

6.0 Summary of Helicopter Gear Sets ....................................................................................................... 6

7.0 Analyses of Condition Indicators ........................................................................................................ 7

8.0 Discussion of Results ........................................................................................................................ 17

9.0 Summary ........................................................................................................................................... 23

Appendix A.—Plots of MSPU Condition Indicators from Damaged Tails ................................................ 25

A.1 Tail Number 1 ......................................................................................................................... 25

A.2 Tail Number 2 ......................................................................................................................... 31

A.3 Tail Number 3 ......................................................................................................................... 37

A.4 Tail Number 4 ......................................................................................................................... 43

A.5 Tail Number 5 ......................................................................................................................... 49

A.6 Tail Number 6 ......................................................................................................................... 55

A.7 Tail Number 7 ......................................................................................................................... 61

A.8 Tail Number 8 ......................................................................................................................... 67

A.9 Tail Number 9 ......................................................................................................................... 73

A.10 Tail Number 10 ....................................................................................................................... 79

A.11 Tail Number 11 ....................................................................................................................... 85

A.12 Tail Number 12 ....................................................................................................................... 91

A.13 Tail Number 13 ....................................................................................................................... 97

A.14 Tail Number 14 ..................................................................................................................... 103

A.15 Tail Number 15 ..................................................................................................................... 109

A.16 Tail Number 16 ..................................................................................................................... 115

A.17 Tail Number 17 ..................................................................................................................... 121

A.18 Tail Number 18 ..................................................................................................................... 127

A.19 Tail Number 19 ..................................................................................................................... 133

A.20 Tail Number 20 ..................................................................................................................... 139

Appendix B.—CI Statistical Parameters Before and After Replacement ................................................. 145

Appendix C.—CI Comparison for Damaged and Undamaged Cases ...................................................... 169

C.1 Output Gear Comparisons ..................................................................................................... 169

C.2 Input Pinion Comparisons ..................................................................................................... 171

References ................................................................................................................................................. 173

NASA/TM—2014-218406 v 
NASA/TM—2014-218406 vi 
Acronyms 

120KTA 120 knots true airspeed regime 

AC Advisory Circular 

AGMA American Gear Manufacturers Association 

CAA Civil Aviation Authority 

CBM Condition-Based Maintenance 

CI Condition Indicator 

DA1 CI Diagnostic Algorithm 1 calculated from the root-mean-square 

DiffDA1 CI DA1 of the difference signal 

DiffP2PC CI Peak-to-peak of difference signal 

DP2P CI Peak-to-peak of difference signal 

FAA Federal Aviation Administration 

FM4 CI Figure of Merit 4 

FPG100 Flat pitch ground 100 percent rotor speed regime 

FPG101 Flat pitch ground 101 percent rotor speed regime 

GL Gear Left 

GR Gear Right 

HUMS Heath and Usage Monitoring System 

MDSS Mechanical Diagnostic System Software 

MSPU Modern Signal Processing Unit 

NASA National Aeronautics and Space Administration 

NGB Nose Gearbox 

PL Pinion Left 

PR Pinion Right 

RMS CI Root-Mean Square 

SAA Space Act Agreement 

SI CI Sideband Index calculated from averaged r 3 sidebands around mesh 

SI1 CI Sideband Index calculated from averaged r 1 sidebands around mesh 

SI1st CI Sideband Index calculated from averaged r 1 sidebands around mesh 

SI3 CI Sideband Index calculated from averaged r 3 sidebands around mesh 

SI3rd CI Sideband Index calculated from averaged r 3 sidebands around mesh 

TDA Tear Down Analysis 

TSA Time Synchronous Averaged Data 

U.S. United States 

1.0 Background 

This report documents the results of an analysis on gear condition indicator data collected on a 

helicopter when damage occurred to spiral bevel gear sets. This analysis was performed as a collaborative 

effort with the Federal Aviation Administration (FAA) and the U.S. Army under a NASA Space Act 

Agreement with the FAA. This work was performed to support validation and demonstration of rotorcraft 

Health and Usage Monitoring Systems (HUMS) for maintenance credits via “FAA Advisory Circular 

(AC) 29–2C, Section MG–15, Airworthiness Approval of Rotorcraft (HUMS)” (Ref. 1). Maintenance 

NASA/TM—2014-218406 1 
credits are modified inspection and removal criteria of components based on HUMS measured condition 

and actual usage. Maintenance credit validation includes providing evidence of damage detection 

algorithm effectiveness using acceptance limits, trending techniques, tests and demonstration methods. 

For dynamic transmission components, these methods can include using data from naturally occurring 

aircraft faults and component fault testing on a test stand (Ref. 2). Due to time, cost and safety concerns, 

evidence via actual service on aircraft is typically replaced with rig tests, where a measurable and known 

component fault is checked against the algorithm and its thresholds. 

The Civil Aviation Authority (CAA) also published a document to provide guidance using vibration 

health monitoring (VHM), defined as “data generated by processing vibration signals to detect incipient 

failures or degradation of mechanical integrity,” for maintaining helicopter rotor and drive systems 

(Ref. 3). These vibration signatures are referred to as “condition indicators” (CI) that develop when a fault 

occurs on a component and interacts with its operational environment. Within this CAA document, fault 

testing is also mentioned as a validation method to demonstrate algorithm damage detection effectiveness 

for specific faults. 

The overarching goal of this work was to define condition indicator validation methods in the test rig 

that better represent their response to faults in the field. Due to differences in both systems and their 

operational environments, response of a CI to a fault in a test rig may not be representative of a CI 

response in a helicopter. For these situations, CI performance limitations must be defined to understand 

the risks in using a test rig validated CI on a helicopter. One obstacle in determining if CI response to a 

fault in a test rig is comparable to its response when measured on a helicopter is the limited availability of 

CI data from a faulted component flying on a helicopter. 

Previous analyses were performed on rotorcraft spiral bevel gear condition indicator performance in 

support of the U.S. Army’s Condition-Based Maintenance (CBM) program (Refs. 4 and 5). CI 

performance was evaluated using fielded helicopter datasets recorded when damage occurred on spiral 

bevel gear (pinion/gear) teeth located in several helicopter nose gearboxes. The nose gearboxes are 

mounted in the front of each engine to reduce the power turbine speed and change the drive angle. In 

addition to thousands of hours of CI data collected before and after spiral bevel gear replacement, tear 

down analyses were performed, documenting the extent of damage to the gear and pinion teeth. Within 

the timeframe when the faulted components were occurring in the helicopters, NASA Glenn Research 

Center had an existing and available component test rig for testing spiral bevel gears, the Spiral Bevel 

Gear Fatigue Test Rig. 

Using this existing in-service HUMS flight data from faulted spiral bevel gears, a plan was put in 

place to design and test comparable gear sets within the constraints of the test rig. The drivers for testing 

in the component test rig, as opposed to a full-scale system, were based on the cost and time it would take 

to design, develop and build testing capabilities combined with the time required to initiate and progress a 

defect in the actual helicopter component. The availability of fielded helicopter HUMS CI data when 

spiral bevel gear damage occurred, the availability of the NASA Glenn Spiral Bevel Gear Fatigue Rig and 

the availability of the same HUMS installed on the helicopters for use in the rig made this a cost effective 

proposition within a reasonable timeframe. The requirements for spiral bevel gear damage progression 

tests to be performed in the NASA Glenn Spiral Bevel Gear Fatigue Test Rig are outlined in Reference 6. 

Results of these tests can be found in Reference 7. 

In the analysis presented in this report, fielded helicopter HUMS data from 40 helicopters are 

processed with the same techniques applied to spiral bevel rig test data (Ref. 7). Twenty helicopters 

experienced damage to the spiral bevel gears, while the other 20 tails had no known anomalies within the 

time frame of the datasets. 

NASA/TM—2014-218406 2 
2.0 Objectives and Approach 

The objective of the analysis presented in this paper was to re-process helicopter health monitoring 

data with comparable analysis techniques applied to health monitoring data collected during spiral bevel 

gear damage progression tests performed in the NASA Glenn Spiral Bevel Gear Fatigue test Rig (Ref. 7). 

HUMS data was collected on 20 helicopters while damage occurred and after component replacement. 

Failure modes observed on the gear teeth and other gearbox components were documented in tear down 

analyses (TDA) provided by the U.S. Army. The specific objectives of the analysis are as follows: 

a) Summarize gear tooth damage modes using tear down analysis reports. 

b) Separate the data per tail into health states: damaged (before replacement); undamaged (after 

replacement). 

c) Evaluate the capability of detecting gear surface pitting fatigue and other generated failure modes 

on spiral bevel gear teeth using gear condition indicators (CI): Figure of Merit 4 (FM4), Root 

Mean Square (RMS) or Diagnostic Algorithm 1 (DA1), r 1 Sideband Index (SI1) and r 3 

Sideband Index (SI3). 

d) Evaluate the capability of detecting gear surface pitting fatigue and other generated failure modes 

on spiral bevel gear teeth using two new gear condition indicators not currently collected 

onboard: DA1 of the difference signal (DiffDA1) and the peak-to-peak of the difference signal 

(DP2P). 

e) Evaluate the effect of regimes on CI performance. 

f) Cluster comparable damage modes from different gear tests. 

3.0 Gearbox Description 

The component under investigation is the spiral bevel gear set in the nose gearbox of the Apache 

helicopter (AH64). A photograph of the location of the nose gearbox in the helicopter is shown in 

Figure 1 (Ref. 6). The failure mode was verified by the tear down analysis (TDA) documentation of the 

gear and pinion teeth damage. Key operational parameters such as torque, speed, oil temperatures and 

pressures, on the helicopters were provided. For the aircraft used in this investigation, the HUMS data 

was acquired, stored, tracked, trended and monitored separately from the operational data (Ref. 8). 

In addition to HUMS data, measurements were made to characterize helicopter static structural 

dynamics. Transfer-path measurements were made on one AH64D left and right nose gearboxes through 

excitation from a piezoelectric shaker and impact testing. The left and right gearboxes mirror each other. 

The measurements were made on the helicopter for another purpose, to help select ideal bearing defectdetection frequency bands (Ref. 9). Additional measurements were made on a nose gearbox installed in a 

fixture at NASA Glenn. External measurements made on the helicopter were compared to external 

measurements made on the fixture under the same conditions. The test fixture enabled the application of 

measured torques—common during an actual operation and the simulation of other environmental 

conditions experienced in the field that could not be made on the helicopter. Measurements were taken 

and compared while impacting the gear set near mesh to simulate gear meshing dynamics. Frequency 

Response functions were calculated for all measurements and compared using the Kolmogorov–Smirnov 

statistical test, a nonparametric test for comparing probability distributions (Ref. 10). The frequency 

response functions measured under comparable conditions of both systems were found to be consistent, 

while gear vibration transfer path dynamics were found to be load dependent within some frequency 

bands (Ref. 11). 

NASA/TM—2014-218406 3 
Figure 1.—Location of spiral bevel gear set in helicopter

4.0 Instrumentation and Data Acquisition 

All of the aircraft HUMS data was collected and processed with a helicopter HUMS, referred to as 

the Modern Signal Processing Unit (MSPU). The MSPU system is an onboard rotorcraft HUMS system 

that acquires, digitizes and processes the tachometer pulses and accelerometer data. The data is then 

downloaded to a ground station, referred to as PC-GBS, for further analysis. The ground station software 

provides the graphical user interface for the user to archive, process and analyze the onboard data. 

Although the MSPU monitors all of the dynamic mechanical components of the drive train in the 

helicopter, the focus for this analysis is limited to the components in the nose gearbox of the helicopter. 

For the MSPU system, one accelerometer is installed on the housing of the right nose gearbox, and one is 

installed on the housing of the left nose gearbox. The accelerometers are mounted radially with respect to 

the gear. Accelerometer frequency range is 0.5 to 5 KHz with a resonant frequency of 26 KHz. One 

magnetic tachometer is installed to measure shaft speed. Gear ratios are used to process the data at the 

correct speed for each component. Time synchronous averaging (TSA) of the vibration data collected 

from the left and right accelerometer is performed in the MSPU system for the pinions and the gears using 

their shaft speeds. TSA methods will be further discussed in Section 7.0, “Analyses of Condition 

Indicators.” 

5.0 Failure Modes 

The failure modes to be investigated were defined by class (contact fatigue), general mode (macro 

pitting) and degree (progressive) per American Gear Manufacturers Association (AGMA) standards for 

gear wear terminology (Ref. 12). Table 1 illustrates the types of damage documented from TDA pictures. 

Scuffing is not a fatigue failure mode, where material is detached from the gear tooth contact, but rather 

the transferring of metal due to welding and tearing due to lubricant-film failure. It should be noted that 

NASA/TM—2014-218406 4 
some of the TDA reports had limited photographs of the type of damage described within the report and 

used different terminology to describe the observed damage. 

A 30 year survey of helicopter failure investigations found 55 percent of component failure was due 

to fatigue type failure modes described as pitting and spalling, while fretting or scuffing was found as the 

third highest factor (Ref. 13). The majority of these failures, over 34 percent, were found in the engine 

and transmission. Fatigue failures found on gear and pinion teeth were found to initiate due to alignment, 

manufacturing defects and lubrication issues (Ref. 13). 

Definitions for tooth surface pitting modes (Ref. 12) are summarized as follows: 

 Initial—Pits less than 1 mm in diameter. 

 Progressive—Pits in different shapes/sizes greater than 1 mm in diameter. 

 Flake—Pits that are shallow thin flakes. 

 Spalling—Pits that cover tooth contact surfaces that exceed progressive pitting. 

A table that connects condition indicator response to maintenance action was provided in reference 

(Ref. 8). It is shown here to provide a feel for the affect the damaged spiral bevel gears had on the 

helicopters discussed in this report. Per the definitions listed in Table 2, the damaged spiral bevel gear 

sets “Operational Capability,” listed in column one, were limited to “Reduced Functionality.” The 

helicopter component damage slowly progressed, where the damage was detectable within a certain size 

and the component performed its intended function with a level of detectable damage. 

TABLE 1.—OBSERVED GEAR FAILURE MODES (REF. 12)

Class Mode Degree 

Contact Fatigue Subcase Fatigue 

 Micropitting 

 Macropitting Initial 

 Progressive 

 Flaking 

 Spalling 

Scuffing Scuffing Mild 

 Moderate 

 Severe 

TABLE 2.—DAMAGE LEVELS (REFS. 8 AND 14) 

Operational capability Maintenance action 

required 

Time horizon for 

maintenance 

Impact to components 

Fully functional No maintenance required Remaining life No perceptible impact to 

components/mating parts 

Functional with degraded 

performance 

Monitor frequently > 100 hr Eventual component/mating part 

degradation from light metal 

contamination /wear/vibration translation 

Reduced functionality Maintain as soon as 

practical 

10 hr < X < 100 hr Moderate metal contamination resulting 

in accelerated component/mating part 

degradation 

Non-critical and non-mission 

aborting failure mode 

Non-urgent maintenance 0 < X < 10 hr Immediate component/mating part 

degradation 

Critical or mission aborting 

failure mode 

Maintain immediately None Heavy metal contamination resulting in 

catastrophic potential 

NASA/TM—2014-218406 5 
6.0 Summary of Helicopter Gear Sets 

Table 3 is a summary of the helicopters analyzed with damaged spiral bevel gear sets. The first 

column identifies the tail number. The second column identifies if the damaged gear set was found in the 

left or right nose gearbox. The next four columns indicate the four components investigated: right pinion 

(PR), right gear (GR), left pinion (PL), left gear (GL). An x in the column indicates damaged was 

observed on this component prior to replacement. A summary of the damage described in the TDA is 

listed in the last column of Table 3. 

The tail number in the first column is color coded based on component and damage modes listed in 

Table 4. The tails greyed out indicate issues with these data sets. For tail number 3, the tail was replaced a 

second time after the initial replacement. Tail number 12 came from an AH64A model, while the other 

tails were AH64D models. For tails numbers 9, 11, 17 and 19, less than 7 data points were recorded prior 

to replacement. 

TABLE 3.—SUMMARY OF HELICOPTERS WITH SPIRAL BEVEL GEAR DAMAGE 

Tail 

no. 

Component PR GR PL GL Damage 

1 Left x x Gear and pinion teeth uneven wear and scuffing; output spline wear 

2 Left x x Gear and pinion severely damaged 

3 Left x x Gear and pinion teeth spalling; output spline wear, output duplex bearing IR spalling 

4 Left x Gear wear and pinion pitting; output bearing IR spalling 

5 Left x Pinion pitting; spline damage 

6 Right x Moderate wear and scuffing on pinion 

7 Right x x Gear and pinion wear and pitting; gear scuffing 

8 Right x x Gear and pinion teeth scuffing; input bearing roller spalling 

9 Right x x Gear and pinion teeth uneven wear and scuffing; output duplex bearing ball damage 

10 Right x Pinion moderate scuffing; output duplex bearing ball spalling 

11 Right x Gear light scuffing; output duplex bearing IR and ball spalling 

12 Right x x Gear and pinion spalling 

13 Right x x Gear tooth chipped on toe side of gear, gear and pinion scuffing, pinion spalling 

14 Left x x Gear and pinion spalling 

15 Left x x Gear and pinion scuffing and spalling 

16 Left x x Gear and pinion severe scuffing on edge of teeth 

17 Left x Pinion severe spalling 

18 Left x Pinion severe spalling 

19 Right x x Pinion severe spalling/root wear (tip interf.); Gear pitting 

20 Right x x Pinion and gear severe pitting 

TABLE 4.—COMPONENT AND DAMAGE MODE COLOR CODES 

Color 

code 

Damage modes 

 Gear and pinion pitting, spalling or scuffing 

 Pinion only pitting, spalling or scuffing 

NASA/TM—2014-218406 6 
7.0 Analyses of Condition Indicators 

Vibration data was collected at sample rates that provided sufficient vibration data for calculating 

time synchronous averages (TSA) by applying techniques for averaging vibration signals over several 

revolutions of the shaft to improve the signal-to-noise ratio (Ref. 15). Vibration signals synchronous with 

the shaft speed intensify relative to non-periodic signals. Using the magnetic tachometer, the vibration 

signal collected from the accelerometer is interpolated into a fixed number of points per shaft revolution. 

Since helicopter gears generate vibration signatures synchronous with gear rotational speed, all the gear 

CIs in the MSPU system use TSA data. 

Signal processing techniques used to extract useful information to calculate a gear CI from the 

vibration signal are discussed in detail in Reference 16. Some gear CIs are calculated directly from the 

TSA signal, such as Root Mean Square (RMS). Some are calculated from the TSA converted to the 

frequency domain, such as Sideband Index (SI). Some convert the TSA signal to the frequency domain, 

filter specific frequencies, convert it back to the time domain, then calculate a statistical parameter from 

this data, such as FM4 (Refs. 15 to 17). These four CIs are calculated from the MSPU system and will be 

further discussed. 

FM4 is one CI used to indicate gear tooth damage. Figure 2, on the left, shows a block diagram of the 

steps required to calculate FM4, a common vibration algorithm used in commercial HUMS (Ref. 15). FM4 

is the kurtosis of the residual or difference signal normalized by the square of the variance. Kurtosis is the 

fourth statistical moment of a signal about its mean (Ref. 16). The purpose of taking the kurtosis of any 

signal is to identify the presence of peaks. When normalized by the squared variance, the kurtosis becomes a 

measure of both the number and amplitude of the peaks, where peaks indicate a gear anomaly (Ref. 18). 

FM4 has shown good results in full scale test stands when single tooth faults are introduced, but poorly on 

fleet data (Ref. 19 and 5). This is most likely due to the level of damage to the gear teeth. FM4 responds 

well to localized faults, but is a poor indicator for faults distributed across multiple teeth (Ref. 7). 

RMS, referred to as DA1 in the MSPU system, is another CI used to indicate gear tooth damage. 

Figure 2, on the right, shows a block diagram of the steps required to calculate RMS. 

Figure 2.—FM4 and RMS Calculation

NASA/TM—2014-218406 7 
Sideband index (SI) is another CI used to indicate gear tooth damage (Ref. 5). SI is a frequency 

domain based CI. The CI value is an average value of sideband amplitudes about the fundamental gear 

mesh frequency. All gears generate a dominant gear mesh (GM) frequency in the vibration signature due 

to each tooth engaging the gear it is driving as the pinion and gear mesh. The gear (or pinion) mesh 

frequency is equal to the number of teeth multiplied by its speed. The number of sidebands included in 

the calculation of the sideband CI can vary with different health monitoring systems. The MSPU system 

only calculates averages of r 3 sidebands, referred to as SI or r 3 Sideband Index or SI3. 

Three additional condition indicators, not currently calculated onboard, were calculated from the 

archived data. One of the three is r 1 sideband or SI1. Figure 3 shows a block diagram of the steps 

required to calculate SI1. The other two were the DA1 of the difference signal (DiffDA1) and the peak-topeak of the difference signal (DP2P). Both use the same process listed for FM4 in the block diagram 

shown in Figure 2, except for the last step. The last step is replaced with the RMS of the difference signal 

(d) for DiffDA1 and the maximum difference signal (d) value minus the minimum (d) value for the DP2P. 

CI data was also calculated for two regimes before and after replacement: 101 percent rotor speed flat 

pitch ground (FPG101) and 120 knots true airspeed (120KTA). Parameters for these two flight regimes 

are shown in Table 5. 

Condition Indicators FM4, RMS, SI1, SI3, DiffDA1 and DP2P for the left gear (GL), left pinion (PL), 

right gear (GR) and right pinion (PR) were plotted for all 20 helicopters per acquisition and date, while 

the helicopter was in the flat pitch ground (FPG101) regime. The same CIs were also plotted per date 

while the helicopter was in the 120KTA regime if this data was available. These plots are located in 

Appendix A, “Plots of MSPU Condition Indicators from Damaged Tail.” 

Figure 3.—SI1 calculation.

NASA/TM—2014-218406 8 
TABLE 5.—HUMS REGIMES 

Parameter Regimes 

FPG101 120KTA 

Radar Alt, ft 0 to 5 6 to 30,000 

Torque, % 5 to 50 50 to 75 

Average Torque, % 15 68 

True Airspeed, kn –30 to 30 111 to 129 

Main Rotor Speed, % 98 to 102 98 to 102 

Vertical Speed, ft/sec –5 to 5 –5 to 5 

Statistical tables of CI mean and standard deviation values were calculated before and after 

replacement for condition indicators FM4, RMS, SI1, SI3, DiffDA1 and DP2P for the GL, GR, PL and 

PR. These tables are limited to the tails that are not greyed out in Table 3. These tables are located in 

Appendix B, “CI Statistical Parameters Before and After Replacement.” A representative example of the 

data contained in the Appendix A and Appendix B will be reviewed for helicopter number 18. The left 

pinion only was spalled prior to replacement on tail number 18. 

Condition Indicators FM4, RMS, SI1, SI3 for the GL, PL, GR, and PR measured on helicopter 

number 18 are plotted in Figure 4 to Figure 9. These plots correspond to Figure A.18.1 to Figure A.18.6 

found in Appendix A. Note that the square on the x-axis indicates the last acquisition prior to inspection 

and replacement of the gearbox. 

Mean and standard deviation values for Condition Indicators FM4, RMS, SI1, SI3, DiffDA1 and 

D2P2 for the GL, PL, GR and PR are listed in Table 6 to Table 11. These tables correspond to Table B.13 

found in Appendix B. If the CI responded to the damaged component, in this case the left pinion, it is 

highlighted in red before gearbox replacement and blue after gearbox replacement. The table columns 

identify the component location, CI name, before or after replacement start acquisition and end 

acquisition, the number of points before and after replacement, the mean value for the component CI and 

the standard deviation for the component CI. For example, the PL FM4 mean value was 4.01 before 

replacement with a 0.32 standard deviation. 

Per Table 3, severe spalling was observed on the left pinion teeth prior to gearbox replacement. FM4, 

SI3, DiffDA1 and DP2P CI values for the left pinion all responded prior to replacement. All four 

exceeded threshold limits set per historical fleet data. FM4 exceeded 4.5, SI1 and SI3 exceeded 6, 

DiffDA1 exceeded 15 and DP2P exceeded 100 prior to replacement for the FPG regime. No120KTA 

regime data was available prior to replacement. 

NASA/TM—2014-218406 9 
Figure 4.—Tail Number 18 Plots of FM4 per Date, Acquisition and Regime

TABLE 6.—FM4 MEAN AND STANDARD DEVIATION FOR TAIL NUMBER 18 

Location CI name Status Index start Index end No. points Mean STD 

PR FM4 Before 1 29 29 2.84 0.31 

PR FM4 After 30 487 457 2.93 0.32 

GR FM4 Before 1 29 29 2.63 0.23 

GR FM4 After 30 485 455 2.63 0.20 

PL FM4 Before 1 29 29 4.01 0.32 

PL FM4 After 30 485 455 2.77 0.31 

GL FM4 Before 1 29 29 2.94 0.26 

GL FM4 After 30 485 455 2.86 0.24 

2009 2010 2011 2012 2013

0

1

2

3

4

5

Date

Magnitude

Tail #18 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

1

2

3

4

5

Acquisition

Magnitude

Tail #18 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

1

2

3

4

5

Date

Magnitude

Tail #18 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 10 
 

Figure 5.—Tail Number 18 Plots of DA1 per Date, Acquisition and Regime

TABLE 7.—DA1 MEAN AND STANDARD DEVIATION FOR TAIL NUMBER 18 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 29 29 20.86 11.61 

PR DA1 After 30 488 458 25.09 10.14 

GR DA1 Before 1 29 29 22.81 11.57 

GR DA1 After 30 488 458 27.25 10.01 

PL DA1 Before 1 29 29 24.43 4.17 

PL DA1 After 30 488 458 19.67 7.78 

GL DA1 Before 1 29 29 15.71 5.14 

GL DA1 After 30 490 460 21.20 7.97 

2009 2010 2011 2012 2013

0

10

20

30

40

50

60

70

Date

Magnitude

Tail #18 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

10

20

30

40

50

60

70

Acquisition

Magnitude

Tail #18 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

10

20

30

40

50

60

70

Date

Magnitude

Tail #18 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 11 
 

Figure 6.—Tail Number 18 Plots of SI1 per Date, Acquisition and Regime

TABLE 8.—SI1 MEAN AND STANDARD DEVIATION FOR TAIL NUMBER 18 

Location CI name Status Index start Index end No. points Mean STD 

PR SI1 Before 1 29 29 1.51 0.44 

PR SI1 After 30 488 458 1.97 0.72 

GR SI1 Before 1 29 29 2.65 0.82 

GR SI1 After 30 488 458 2.67 1.10 

PL SI1 Before 1 29 29 4.54 1.04 

PL SI1 After 30 488 458 2.17 0.69 

GL SI1 Before 1 29 29 1.51 0.62 

GL SI1 After 30 490 460 2.66 1.03 

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

2

4

6

8

10

Acquisition

Magnitude

Tail #18 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 12 
 

Figure 7.—Tail Number 18 Plots of SI3 per Date, Acquisition and Regime

TABLE 9.—SI3 MEAN AND STANDARD DEVIATION FOR TAIL NUMBER 18 

Location CI name Status Index start Index end No. points Mean STD 

PR SI3 Before 1 29 29 0.89 0.18 

PR SI3 After 30 488 458 1.04 0.28 

GR SI3 Before 1 29 29 2.99 0.47 

GR SI3 After 30 488 458 3.74 0.77 

PL SI3 Before 1 29 29 5.23 0.92 

PL SI3 After 30 488 458 1.38 0.32 

GL SI3 Before 1 29 29 1.04 0.39 

GL SI3 After 30 490 460 2.43 0.82 

 

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

2

4

6

8

10

Acquisition

Magnitude

Tail #18 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 13 
 

Figure 8.—Tail Number 18 Plots of DiffDA1 per Date, Acquisition and Regime

TABLE 10.—DiffDA1 MEAN AND STANDARD DEVIATION FOR TAIL NUMBER 18 

Location CI name Status Index start Index end No. points Mean STD 

PR DiffDA1 Before 1 29 29 3.56 1.11 

PR DiffDA1 After 30 488 458 3.87 1.03 

GR DiffDA1 Before 1 29 29 7.27 0.98 

GR DiffDA1 After 30 488 458 8.93 1.67 

PL DiffDA1 Before 1 29 29 18.68 3.04 

PL DiffDA1 After 30 488 458 5.47 0.63 

GL DiffDA1 Before 1 29 29 4.88 0.30 

GL DiffDA1 After 30 490 460 8.06 1.25 

 

2009 2010 2011 2012 2013

0

5

10

15

20

25

Date

Magnitude

Tail #18 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

5

10

15

20

25

Acquisition

Magnitude

Tail #18 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

5

10

15

20

25

Date

Magnitude

Tail #18 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 14 
 

Figure 9.—Tail Number 18 Plots of DP2P per Date, Acquisition and Regime

TABLE 11.—D2P2 MEAN AND STANDARD DEVIATION FOR TAIL NUMBER 18 

Location CI Name Status Index Start Index End No. Points Mean STD 

PR DP2P Before 1 29 29 19.76 6.61 

PR DP2P After 30 488 458 21.55 6.20 

GR DP2P Before 1 29 29 40.34 5.56 

GR DP2P After 30 488 458 49.65 9.62 

PL DP2P Before 1 29 29 117.59 18.23 

PL DP2P After 30 488 458 29.25 4.65 

GL DP2P Before 1 29 29 28.36 2.73 

GL DP2P After 30 490 460 46.08 7.39 

The CI data from the 20 tails without damage was not individually plotted. Instead, histograms of the 

CI data from all 20 tails and a matrix comparing all six CIs were plotted for the pinion and the gear at the 

FPG and 120KTA regimes. This data was also generated for the damaged cases to enable a visual 

comparison between the CI data for the damaged and undamaged cases at the two regimes. These plots 

are located in Appendix C, “CI Comparison for Damaged and Undamaged Cases.” A representative 

example of the data contained in the Appendix C will be reviewed for the output gear damaged and 

undamaged cases during the FPG regime. 

2009 2010 2011 2012 2013

0

20

40

60

80

100

120

140

160

180

Date

Magnitude

Tail #18 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

20

40

60

80

100

120

140

160

180

Acquisition

Magnitude

Tail #18 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

20

40

60

80

100

120

140

160

180

Date

Magnitude

Tail #18 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 15 
Figure 10, Figure C.1.1 in Appendix C, contains histograms and gear CI data at the FPG regime using 

data from helicopters with undamaged components and helicopters with damaged components. The 

damaged component data set contains CI data before replacement only. The top plot, in green, is the data 

from the 20 tails without damage. The bottom plot, in red, is the plot of the tails with gear set damage. 

The histograms are shown in blue. The matrix of plots enables linear relationships between the CIs to be 

seen. These plots also provide a qualitative representation of the differences in CI values between the 

damaged and undamaged cases. 

Figure 10.—Output Gear CI at FPG

NASA/TM—2014-218406 16 
Reviewing Appendix C, visual comparisons can be made between the CI data for the damaged and 

undamaged cases for both the FPG and 120KTA regimes. From these plots, several observations can be 

made for pinion and gear response for both regimes, for the undamaged and damaged cases. One is that 

the distributions are different for the damaged and undamaged cases. The other is that a linear relationship 

can be seen between SI1and SI3 and between DiffDA1 and DP2P. This is due to the similarity in the 

means these CIs are calculated. 

Comparing undamaged to damaged cases, for both regimes, for the pinion CIs, overall magnitude was 

higher for the damaged cases for all CIs, except FM4. Comparing damaged cases only for both regimes, 

the CI magnitudes were comparable. Comparing undamaged cases only, DA1 values were slightly higher 

at 120KTA, while DiffDA1 and DP2P were higher at FPG. 

Comparing undamaged to damaged cases, for the FPG regime, for the gear CIs, overall magnitude 

was higher for the damaged cases for all CIs. For the 120KTA regime, the overall magnitude was higher 

for the damaged cases for FM4, DiffDA1 and DP2P, but were comparable for SI1, SI3 and DA1. 

Comparing damaged cases only for both regimes, SI1 and SI3 were higher at FPG, while DiffDA1 and 

DP2P were higher at 120KTA. Comparing undamaged cases only, DA1, DiffDA1 and DP2P were higher 

at 120KTA. 

Many factors affect the vibration response to gear and pinion tooth damage. These include fault type 

(gear or pinion), how the fault changes the signature response at mesh and the path the vibration response 

takes to get to the accelerometer. Per this qualitative assessment, it appears regime can also affect CI 

response to gear faults. 

8.0 Discussion of Results 

An initial assessment was made to evaluate the relationship between CI response to specific faulted 

components and regimes using the CI data from the baseline and damaged tails. Pearson Correlation 

Coefficients (r) were calculated to measure the strength and direction of the linear relationship between 

two parameters (Ref. 20). Correlation coefficients are calculated by dividing the covariance of the two 

variables (x, y) by the product of their standard deviations as shown in Equation (1) (Ref. 20). 

  

      2

2

2

¦ 2 ¦ ¦ ¦

¦ ¦ ¦

 



 

y n y n x x

n xy x y

r (1) 

Its value ranges between –1 and +1. A perfect linear relationship between two parameters will have a 

correlation coefficient of 1 or –1. A value close to zero indicates no linear relationship between the two 

parameters. Hypothesis tests can be used to assess the significance of the relationship between the two 

parameters; however, a good rule of thumb is that values greater than 0.7 indicate a strong correlation and 

values less than 0.5 indicate a weak correlation. 

A correlation matrix is generated for the entire dataset showing the linear relationship between the 

CIs to a damage state for the two regimes. To do this, CI data from the undamaged state and damaged 

state was paired with a damage parameter. This damage parameter was zero for the undamaged state and 

one for the damaged state. The correlation matrices for the output gear and the input pinion at the two 

regimes are shown in Figure 11 and Figure 12. 

Figure 11 and Figure 12 provide plots and correlation coefficient for the combined undamaged and 

damaged tails at the two regimes. The strong linear relationship seen between SI1and SI3 and between 

DiffDA1 and DP2P in Figure 10, can also be seen and quantified in these plots with correlation 

coefficient values of 0.9 or greater. However, none of the correlation coefficient values between CIs and 

damage state exceeded 0.7. This is most likely due to the variance in the undamaged data set. 

NASA/TM—2014-218406 17 
Figure 11.—Output Gear CI Correlation Matrix

NASA/TM—2014-218406 18 
Figure 12.—Input Pinion CI Correlation Matrix

NASA/TM—2014-218406 19 
The next assessment of CI response to damage was only applied to the data from the tails with 

damage. For this method, CIs are analyzed per individual tail, not per fleet, crosses a discrete threshold 

prior to replacement and decreases to below the threshold after replacement. Table 12 summarizes the 

performance of the CIs for each tail to specific component faults. This table was generated from 

reviewing the summary of helicopters with spiral bevel gear tooth damage listed in Table 3, plots of CIs 

in Appendix A and CI statistical parameter tables in Appendix B. Similar to Table 3, tails with 

comparable failure modes and faulted components are color coded the same. Another column labeled “O” 

was added to this table. This represents other faulted components that were mentioned in the TDA in the 

same gearbox with the damaged gears. An “S” indicates spline wear or damage. An O indicates output 

bearing wear or damage. An “I” indicates input bearing wear or damage. The thresholds used to assess 

performance are listed as greater than or equal to a specific threshold. The cells highlighted in green 

indicate the CI of the damaged component responded to damage. The cells highlighted in blue indicate 

the meshing component responded. For example, for tail no. 13, the right gear was damaged but several 

right pinion CIs responded. The cells highlighted in light grey were unresponsive. The “*” indicates the 

CI responded during the 120KTA regime. If no “*” is shown, it indicates the CI measured during the 

FPG101 regime. 

Note that the 120KTA regime data was not available for all tails before and after replacement. For tail 

no. 15, no 120KTA data was available for before and after replacement. For tails numbers 1, 7, and 18 not 

120KTA data was available before replacement. The effect of regime on CI response could not be 

evaluated for these four tails. For tail no. 20, no 120KTA data was available after replacement. 

TABLE 12.—SUMMARY OF CI RESPONSE 

Tail 

no. 

PR GR PL GL O DA1 > 80 FM4 > 4.5 SI1 > 6 SI3 > 6 DiffDA1 > 15 DP2P > 80 

1 x x S GL PL PL 

2 x x PL* PL*,GL* 

3 x x S,O 

4 x O PL,PL*,GL,GL* PL,PL*,GL,GL* PL PL,GL,PL* PL,PL*,GL,GL* 

5 x S PL,PL* PL* PL,PL* PL ,PL* 

6 x PR* PR* PR,GR* PR,GR* 

7 x x GR GR 

8 x x I PR,PR* 

9 x x O 

10 x O GR* PR* PR* 

11 x O 

12 x x 

13 x x PR,PR* GR* PR,PR* PR,PR* GR,GR*,PR,PR* GR,GR*,PR,PR* 

14 x x PL,PL*,GL,GL* PL,PL*,GL,GL* PL,PL*,GL,GL* PL,PL*,GL,GL* PL,PL*,GL,GL* 

15 x x PL PL PL PL PL 

16 x x PL,PL*,GL,GL* GL,PL PL,PL*,GL,GL* PL,PL*,GL,GL* 

17 x 

18 x PL PL PL PL 

19 x x 

20 x x GR,PR GR,PR GR PR,PR* PR,PR* 

NASA/TM—2014-218406 20 
After reviewing the CI plots and statistical tables in Appendix A and Appendix B, a summary of each 

CI response to component failure modes is summarized below: 

DA1 responded to damage for six tails: numbers 4, 13, 14, 15, 16 and 20. 

x PL, PL*, GL and GL* responded to one tail (no. 4) with left pinion and output bearing damage 

and two tails (nos.14 and 16) with left gear and pinion damage and one tail (no. 4) with left 

pinion and output bearing damage. 

x PL responded to one tail (no. 15) with left gear and pinion damage. This was the case of moderate 

wear to the gear and pinion teeth. 

x PR and PR* responded to one tail (no. 13) with right pinion and gear damage. This was the case 

of the chipped gear tooth on the toe side. 

x PR and GR responded to one tail (no. 20) with right gear and pinion damage. 

x For several tails where the CI responded poorly, the CI value was monotonic. 

x Since the FPG101 regime has a wide torque band, and this CI is known for its sensitivity to 

torque, this may be the cause of its poor performance. 

FM4 responded to damage for four tails: numbers 1, 7, 13 and 18. 

x GL responded to one tail (no. 1) with left pinion and gear damage and spline wear. 

x GR responded to one tail (no. 7) with right pinion and gear damage. 

x GR* responded to one tail (no. 13) with right gear and pinion damage. 

x PL responded to one tail (no. 18) with left pinion damage. 

x FM4 was not as responsive to damage as the other five CIs. 

SI1 responded to damage for 10 tails: numbers 4, 5, 6, 8, 10, 13, 14, 15, 16, and 20. 

x PL, PL*, GL and GL* responded to one tail (no. 4) with left pinion and output bearing damage. 

x PL and PL* responded to one tail (no. 5) with left pinion and spline damage. 

x PR* responded to one tail (no. 6) with right pinion damage. 

x PR and PR* responded to one tail (no. 8) with right pinion and input bearing damage. 

x GR* responded to one tail (no. 10) with right pinion and output bearing damage. 

x PR and PR* responded to one tail (no. 13) with right pinion and gear damage. 

x PL, PL*, GL and GL* responded to one tail (no. 14) with left pinion and gear damage. 

x PL responded to one tail (no. 15) with left pinion and gear damage. 

x PL and GL responded to one tail (no. 16) with left pinion and gear damage. 

x PR and GR responded to one tail (no. 20) with right pinion and gear damage. 

x For tails numbers 10 and 13, the meshing component CI responded to damage. 

SI3 responded to damage for eight tails: numbers 4, 5, 6, 13, 14, 15, 18, and 20. 

x PL responded to one tail (no. 4) with left pinion and output bearing damage. 

x PL* responded to one tail (no. 5) with left pinion and spline damage. 

x PR* responded to one tail (no. 6) with right pinion damage. 

x PR* responded to one tail (no. 13) with right pinion and gear damage. 

x PL, PL*, GL and GL* responded to one tail (no. 14) with left pinion and gear damage. 

x PL responded to one tail (no. 15) with left pinion and gear damage. 

x PL responded to one tail (no. 18) with left pinion damage. 

NASA/TM—2014-218406 21 
x GR responded to one tail (no. 20) with right pinion and gear damage. 

x The pinion CIs were more response to different regimes than the gear CIs. 

DiffDA1 responded to damage for 12 tails: numbers 1, 2, 4, 5, 6, 10, 13, 14, 15, 16, 18, and 20. 

x PL responded to one tail (no. 1) with left pinion and gear damage and spline wear. 

x PL* responded to one tail (no. 2) with left pinion and gear damage. 

x PL, PL* and GL responded to one tail (no. 4) with left pinion and output bearing damage. 

x PL and PL* responded to one tail (no. 5) with left pinion and spline damage. 

x PR and GR* responded to one tail (no. 6) with right pinion damage. 

x PR* responded to one tail (no. 10) with right pinion and output bearing damage. 

x PR, PR*, GR and GR* responded to one tail (no. 13) with right pinion and gear damage. 

x PL, PL* GL and GL* responded to one tail (no. 14) with left pinion and gear damage. 

x PL responded to one tail (no. 15) with left pinion and gear damage. 

x PL, PL*, GL and GL* responded to one tail (no. 16) with left pinion and gear damage. 

x PL responded to one tail (no. 18) with left pinion damage. 

x PR and PR* responded to one tail (no. 20) with right pinion and gear damage. 

DP2P responded to damage for 13 tails: numbers 1, 2, 4, 5, 6, 7, 10, 13, 14, 15, 16, 18, and 20. 

x PL responded to one tail (no. 1) with left pinion and gear damage and spline wear. 

x PL* and GL* responded to one tail (no. 2) with left pinion and gear damage. 

x PL, PL*, GL and GL* responded to one tail (no. 4) with left pinion and output bearing damage. 

x PL and PL* responded to one tail (no. 5) with left pinion and spline damage. 

x PR and GR* responded to one tail (no. 6) with right pinion damage. 

x GR responded to one tail (no. 7) with right pinion and gear damage. 

x PR* responded to one tail (no. 10) with right pinion and output bearing damage. 

x PR, PR*, GR and GR* responded to one tail (no. 13) with right pinion and gear damage. 

x PL, PL* GL and GL* responded to one tail (no. 14) with left pinion and gear damage. 

x PL responded to one tail (no. 15) with left pinion and gear damage. 

x PL, PL*, GL and GL* responded to one tail (no. 16) with left pinion and gear damage. 

x PL responded to one tail (no. 18) with left pinion damage. 

x PR and PR* responded to one tail (no. 20) with right pinion and gear damage. 

Based on the review of the six CIs for the four components, DP2P responded the best to varying 

levels of damage on thirteen of the fourteen helicopters evaluated. This CI was not available in the 

onboard MSPU HUMS during occurrences of damage. It was also not available during damage 

progression tests in the test rig MSPU HUMS (Ref. 7). 

DiffDA1 responded to varying levels of damage on 12 helicopters and SI1 responded to ten of the 

fourteen helicopters evaluated. These two CIs were also not available in the onboard MSPU HUMS 

during occurrences of damage. They were also not available during damage progression tests in the test 

rig MSPU HUMS. Note that SI1 was the only CI that responded to right pinion damage on helicopter 

number 8. This was also the only helicopter with right input bearing damage prior to replacement. 

Of the three CIs currently available in the MSPU, DA1, FM4 and SI3, SI3, responded to eight, DA1 

responded to six and FM4 responded to four of the 14 helicopters evaluated. FM4, the poorest performing 

CI, was not as responsive to damage as the other five CIs. Conversely, when compared to the other two, it 

NASA/TM—2014-218406 22 
was the only CI that responded to right gear and pinion damage on helicopter no. 7 and left gear and 

pinion damage on helicopter no. 1. 

For tail no. 8, only one CI, SI1, indicated damage to the right pinion. This type of damage was 

described as pinion teeth scuffing. However, CI response could not be correlated to the different failure 

modes described in the TDA. Since limited pictures were available and the description was subjective to 

the interpretation of the person performing the inspection, this analysis was inconclusive. In some cases, 

the CI of the component meshing with the damaged component responded. 

Some CIs responded better at 120KTA regime instead of FPG101 regime. For tail no. 10, the only 

CIs at the 120KTA regime indicated damage to the right pinion. This may be due to the different torque 

bands used for each regime. Due to the wide torque band for each regime, more studies are required to 

determine their sensitivity to the changes within this band. 

9.0 Summary 

Helicopter health monitoring data from 40 helicopters, 20 with no known anomalies and 20 with 

spiral bevel gear damage, was processed with the same techniques applied to spiral bevel rig test data. 

Vibration-based gear condition indicators data was available when damage occurred and after the gear 

sets were replaced. Three onboard gear condition indicators were evaluated at two helicopter regimes. 

These included Figure of Merit 4 (FM4), Root Mean Square (RMS) or DA1 and r 3 Sideband Index 

(SI3). Three additional condition indicators, not currently calculated onboard, were calculated from the 

archived data. These three were r 1 Sideband Index (SI1), the DA1 of the difference signal (DiffDA1) 

and the peak-to-peak of the difference signal (DP2P). 

Results found DP2P, performed the best, responding to varying levels of damage on 13 of the 14 

helicopters evaluated. DiffDA1and SI1 also performed well responding to 12 and 10 of the 14 helicopters 

evaluated. Of the three CIs currently available in the MSPU, DA1, FM4 and SI3, SI3, responded to eight, 

DA1 responded to six and FM4 responded to four of the 14 helicopters evaluated. FM4, the poorest 

performing CI, was not as responsive to damage as the other five CIs. Conversely, when compared to the 

other two, it was the only CI that responded to damage on two helicopters. Regime did affect CI response 

to some gear faults. 

Results from the analysis of the helicopter data, published in this report, and the rig data published in 

Reference 7 will be combined into a third report titled, “Investigation of Spiral Bevel Gear Condition 

Indicator Validation Via AC–29–2C. In the third, and final, report, test rig damage progression data will 

be compared to fielded rotorcraft. Observations, findings and lessons learned using subscale rig failure 

progression tests to validate helicopter gear condition indicators will be discussed. 

 

NASA/TM—2014-218406 23 
NASA/TM—2014-218406 24 
Appendix A.—Plots of MSPU Condition Indicators from Damaged Tails 

A.1 Tail Number 1 

Figure A.1.1.—Tail Number 1 Plots of FM4 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #1 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350

0

1

2

3

4

5

6

7

8

Acquisition

Magnitude

Tail #1 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

Feb/09 Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan/10

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #1 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 25 
 

Figure A.1.2.—Tail Number 1 Plots of DA1 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #1 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350

0

5

10

15

20

25

30

35

40

45

Acquisition

Magnitude

Tail #1 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

Feb/09 Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan/10

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #1 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 26 
 

Figure A.1.3.—Tail Number 1 Plots of SI1 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #1 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350

0

1

2

3

4

5

6

7

8

Acquisition

Magnitude

Tail #1 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

Feb/09 Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan/10

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #1 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 27 
 

Figure A.1.4.—Tail Number 1 Plots of SI3 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #1 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #1 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

Feb/09 Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan/10

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #1 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 28 
 

Figure A.1.5.—Tail Number 1 Plots of DiffDA1 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #1 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350

0

5

10

15

20

25

30

35

40

45

Acquisition

Magnitude

Tail #1 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

Feb/09 Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan/10

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #1 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 29 
 

Figure A.1.6.—Tail Number 1 Plots of DP2P per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #1 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350

0

20

40

60

80

100

120

140

Acquisition

Magnitude

Tail #1 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

Feb/09 Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan/10

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #1 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 30 
A.2 Tail Number 2 

Figure A.2.1.—Tail Number 2 Plots of FM4 per Date, Acquisition and Regime

2007 2008 2009 2010

0

1

2

3

4

5

6

Date

Magnitude

Tail #2 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800 900

0

1

2

3

4

5

6

Acquisition

Magnitude

Tail #2 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

1

2

3

4

5

6

Date

Magnitude

Tail #2 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 31 
Figure A.2.2.—Tail Number 2 Plots of DA1 per Date, Acquisition and Regime

2007 2008 2009 2010

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #2 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

10

20

30

40

50

60

70

80

Acquisition

Magnitude

Tail #2 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #2 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 32 
Figure A.2.3.—Tail Number 2 Plots of SI1 per Date, Acquisition and Regime

2007 2008 2009 2010

0

2

4

6

8

10

Date

Magnitude

Tail #2 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

2

4

6

8

10

Acquisition

Magnitude

Tail #2 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2007 2008 2009 2010

0

2

4

6

8

10

Date

Magnitude

Tail #2 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 33 
Figure A.2.4.—Tail Number 2 Plots of SI3 per Date, Acquisition and Regime

2007 2008 2009 2010

0

1

2

3

4

5

6

Date

Magnitude

Tail #2 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

1

2

3

4

5

6

Acquisition

Magnitude

Tail #2 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2007 2008 2009 2010

0

1

2

3

4

5

6

Date

Magnitude

Tail #2 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 34 
Figure A.2.5.—Tail Number 2 Plots of DiffDA1 per Date, Acquisition and Regime

2007 2008 2009 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #2 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

5

10

15

20

25

30

35

Acquisition

Magnitude

Tail #2 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #2 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 35 
Figure A.2.6.—Tail Number 2 Plots of D2P2 per Date, Acquisition and Regime

2007 2008 2009 2010

0

20

40

60

80

100

120

140

160

180

Date

Magnitude

Tail #2 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

20

40

60

80

100

120

140

160

180

Acquisition

Magnitude

Tail #2 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2007 2008 2009 2010

0

20

40

60

80

100

120

140

160

180

Date

Magnitude

Tail #2 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 36 
A.3 Tail Number 3 

Figure A.3.1.—Tail Number 3 Plots of FM4 per Date, Acquisition and Regime

2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #3 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800 900

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #3 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #3 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 37 
Figure A.3.2.—Tail Number 3 Plots of DA1 per Date, Acquisition and Regime

2008 2009 2010

0

20

40

60

80

100

120

Date

Magnitude

Tail #3 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800 900

0

20

40

60

80

100

120

Acquisition

Magnitude

Tail #3 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2008 2009 2010

0

20

40

60

80

100

120

Date

Magnitude

Tail #3 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 38 
 

Figure A.3.3.—Tail Number 3 Plots of SI1 per Date, Acquisition and Regime

2008 2009 2010

0

5

10

15

20

Date

Magnitude

Tail #3 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800 900

0

5

10

15

20

Acquisition

Magnitude

Tail #3 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2008 2009 2010

0

5

10

15

20

Date

Magnitude

Tail #3 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 39 
 

Figure A.3.4.—Tail Number 3 Plots of SI3 per Date, Acquisition and Regime

2008 2009 2010

0

2

4

6

8

10

12

Date

Magnitude

Tail #3 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800 900

0

2

4

6

8

10

12

Acquisition

Magnitude

Tail #3 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2008 2009 2010

0

2

4

6

8

10

12

Date

Magnitude

Tail #3 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 40 
 

Figure A.3.5.—Tail Number 3 Plots of DiffDA1 per Date, Acquisition and Regime

2008 2009 2010

0

5

10

15

20

25

Date

Magnitude

Tail #3 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800 900

0

5

10

15

20

25

Acquisition

Magnitude

Tail #3 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2008 2009 2010

0

5

10

15

20

25

Date

Magnitude

Tail #3 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 41 
 

Figure A.3.6.—Tail Number 3 Plots of DP2P per Date, Acquisition and Regime

0 100 200 300 400 500 600 700 800 900

0

50

100

150

Acquisition

Magnitude

Tail #3 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2008 2009 2010

0

50

100

150

Date

Magnitude

Tail #3 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2008 2009 2010

0

50

100

150

Date

Magnitude

Tail #3 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 42 
A.4 Tail Number 4 

 

Figure A.4.1.—Tail Number 4 Plots of FM4 per Date, Acquisition and Regime

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #4 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #4 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #4 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 43 
 

Figure A.4.2.—Tail Number 4 Plots of DA1 per Date, Acquisition and Regime

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

20

40

60

80

100

Date

Magnitude

Tail #4 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400

0

20

40

60

80

100

Acquisition

Magnitude

Tail #4 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

20

40

60

80

100

Date

Magnitude

Tail #4 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 44 
 

Figure A.4.3.—Tail Number 4 Plots of SI1 per Date, Acquisition and Regime

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

2

4

6

8

10

12

14

Date

Magnitude

Tail #4 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400

0

2

4

6

8

10

12

14

Acquisition

Magnitude

Tail #4 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

2

4

6

8

10

12

14

Date

Magnitude

Tail #4 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 45 
 

Figure A.4.4.—Tail Number 4 Plots of SI3 per Date, Acquisition and Regime

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #4 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400

0

1

2

3

4

5

6

7

8

Acquisition

Magnitude

Tail #4 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #4 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 46 
 

Figure A.4.5.—Tail Number 4 Plots of DiffDA1 per Date, Acquisition and Regime

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

5

10

15

20

Date

Magnitude

Tail #4 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400

0

5

10

15

20

Acquisition

Magnitude

Tail #4 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

5

10

15

20

Date

Magnitude

Tail #4 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 47 
 

Figure A.4.6.—Tail Number 4 Plots of DP2P per Date, Acquisition and Regime

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

20

40

60

80

100

120

Date

Magnitude

Tail #4 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400

0

20

40

60

80

100

120

Acquisition

Magnitude

Tail #4 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

Q2-08 Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

20

40

60

80

100

120

Date

Magnitude

Tail #4 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 48 
A.5 Tail Number 5 

 

Figure A.5.1.—Tail Number 5 Plots of FM4 per Date, Acquisition and Regime

2007 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #5 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #5 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2007 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #5 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 49 
 

Figure A.5.2.—Tail Number 5 Plots of DA1 per Date, Acquisition and Regime

2007 2010

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #5 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

10

20

30

40

50

60

70

80

Acquisition

Magnitude

Tail #5 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2007 2010

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #5 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 50 
 

Figure A.5.3.—Tail Number 5 Plots of SI1 per Date, Acquisition and Regime

2007 2010

0

2

4

6

8

10

12

Date

Magnitude

Tail #5 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

2

4

6

8

10

12

Acquisition

Magnitude

Tail #5 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2007 2010

0

2

4

6

8

10

12

Date

Magnitude

Tail #5 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 51 
 

Figure A.5.4.—Tail Number 5 Plots of SI3 per Date, Acquisition and Regime

2007 2010

0

2

4

6

8

10

Date

Magnitude

Tail #5 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

2

4

6

8

10

Acquisition

Magnitude

Tail #5 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2007 2010

0

2

4

6

8

10

Date

Magnitude

Tail #5 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 52 
 

Figure A.5.5.—Tail Number 5 Plots of DiffDA1 per Date, Acquisition and Regime

2007 2010

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #5 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

5

10

15

20

25

30

35

40

45

Acquisition

Magnitude

Tail #5 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2007 2010

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #5 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 53 
 

Figure A.5.6.—Tail Number 5 Plots of DP2P per Date, Acquisition and Regime

2007 2010

0

50

100

150

200

250

Date

Magnitude

Tail #5 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

50

100

150

200

250

Acquisition

Magnitude

Tail #5 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2007 2010

0

50

100

150

200

250

Date

Magnitude

Tail #5 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 54 
A.6 Tail Number 6 

 

Figure A.6.1.—Tail Number 6 Plots of FM4 per Date, Acquisition and Regime

0 100 200 300 400 500 600 700 800

0

1

2

3

4

5

Acquisition

Magnitude

Tail #6 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

1

2

3

4

5

Date

Magnitude

Tail #6 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

1

2

3

4

5

Date

Magnitude

Tail #6 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 55 
 

Figure A.6.2.—Tail Number 6 Plots of DA1 per Date, Acquisition and Regime

0 100 200 300 400 500 600 700 800

0

20

40

60

80

100

120

140

Acquisition

Magnitude

Tail #6 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #6 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #6 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 56 
 

Figure A.6.3.—Tail Number 6 Plots of SI1 per Date, Acquisition and Regime

0 100 200 300 400 500 600 700 800

0

2

4

6

8

10

12

14

16

18

Acquisition

Magnitude

Tail #6 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2007 2008 2009 2010

0

2

4

6

8

10

12

14

16

18

Date

Magnitude

Tail #6 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2007 2008 2009 2010

0

2

4

6

8

10

12

14

16

18

Date

Magnitude

Tail #6 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 57 
 

Figure A.6.4.—Tail Number 6 Plots of SI3 per Date, Acquisition and Regime

0 100 200 300 400 500 600 700 800

0

1

2

3

4

5

6

7

8

9

Acquisition

Magnitude

Tail #6 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2007 2008 2009 2010

0

1

2

3

4

5

6

7

8

9

Date

Magnitude

Tail #6 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2007 2008 2009 2010

0

1

2

3

4

5

6

7

8

9

Date

Magnitude

Tail #6 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 58 
 

Figure A.6.5.—Tail Number 6 Plots of DiffDA1 per Date, Acquisition and Regime

0 100 200 300 400 500 600 700 800

0

5

10

15

20

25

Acquisition

Magnitude

Tail #6 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

5

10

15

20

25

Date

Magnitude

Tail #6 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2007 2008 2009 2010

0

5

10

15

20

25

Date

Magnitude

Tail #6 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 59 
 

Figure A.6.6.—Tail Number 6 Plots of D2P2 per Date, Acquisition and Regime

0 100 200 300 400 500 600 700 800

0

20

40

60

80

100

120

140

Acquisition

Magnitude

Tail #6 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2007 2008 2009 2010

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #6 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2007 2008 2009 2010

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #6 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 60 
A.7 Tail Number 7 

 

Figure A.7.1.—Tail Number 7 Plots of FM4 per Date, Acquisition and Regime

2008 2009 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #7 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 200 400 600 800 1000 1200

0

1

2

3

4

5

6

7

Acquisition

Magnitude

Tail #7 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2008 2009 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #7 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 61 
 

Figure A.7.2.—Tail Number 7 Plots of DA1 per Date, Acquisition and Regime

2008 2009 2010

0

10

20

30

40

50

60

Date

Magnitude

Tail #7 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 200 400 600 800 1000 1200

0

10

20

30

40

50

60

Acquisition

Magnitude

Tail #7 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2008 2009 2010

0

10

20

30

40

50

60

Date

Magnitude

Tail #7 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 62 
 

Figure A.7.3.—Tail Number 7 Plots of SI1 per Date, Acquisition and Regime

2008 2009 2010

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #7 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 200 400 600 800 1000 1200

0

1

2

3

4

5

6

7

8

Acquisition

Magnitude

Tail #7 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2008 2009 2010

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #7 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 63 
 

Figure A.7.4.—Tail Number 7 Plots of SI3 per Date, Acquisition and Regime

2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #7 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 200 400 600 800 1000 1200

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #7 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #7 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 64 
 

Figure A.7.5.—Tail Number 7 Plots of DiffDA1 per Date, Acquisition and Regime

2008 2009 2010

0

10

20

30

40

50

Date

Magnitude

Tail #7 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 200 400 600 800 1000 1200

0

10

20

30

40

50

Acquisition

Magnitude

Tail #7 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2008 2009 2010

0

10

20

30

40

50

Date

Magnitude

Tail #7 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 65 
 

Figure A.7.6.—Tail Number 7 Plots of D2P2 per Date, Acquisition and Regime

2008 2009 2010

0

50

100

150

200

250

Date

Magnitude

Tail #7 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 200 400 600 800 1000 1200

0

50

100

150

200

250

Acquisition

Magnitude

Tail #7 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2008 2009 2010

0

50

100

150

200

250

Date

Magnitude

Tail #7 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 66 
A.8 Tail Number 8 

 

Figure A.8.1.—Tail Number 8 Plots of FM4 per Date, Acquisition and Regime

2007 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #8 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #8 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2007 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #8 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 67 
 

Figure A.8.2.—Tail Number 8 Plots of DA1 per Date, Acquisition and Regime

2007 2010

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #8 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

10

20

30

40

50

60

70

80

Acquisition

Magnitude

Tail #8 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2007 2010

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #8 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 68 
 

Figure A.8.3.—Tail Number 8 Plots of SI1 per Date, Acquisition and Regime

2007 2010

0

5

10

15

Date

Magnitude

Tail #8 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

5

10

15

Acquisition

Magnitude

Tail #8 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2007 2010

0

5

10

15

Date

Magnitude

Tail #8 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 69 
 

Figure A.8.4.—Tail Number 8 Plots of SI3 per Date, Acquisition and Regime

2007 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #8 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

1

2

3

4

5

6

7

Acquisition

Magnitude

Tail #8 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2007 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #8 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 70 
 

Figure A.8.5.—Tail Number 8 Plots of DiffDA1 per Date, Acquisition and Regime

2007 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #8 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

5

10

15

20

25

30

35

Acquisition

Magnitude

Tail #8 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2007 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #8 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 71 
 

Figure A.8.6.—Tail Number 8 Plots of DP2P per Date, Acquisition and Regime

2007 2010

0

50

100

150

Date

Magnitude

Tail #8 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

50

100

150

Acquisition

Magnitude

Tail #8 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2007 2010

0

50

100

150

Date

Magnitude

Tail #8 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 72 
A.9 Tail Number 9 

 

 

Figure A.9.1.—Tail Number 9 Plots of FM4 per Date, Acquisition and Regime

2007 2008 2009 2010 2011

0

1

2

3

4

5

Date

Magnitude

Tail #9 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

1

2

3

4

5

Acquisition

Magnitude

Tail #9 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2007 2008 2009 2010 2011

0

1

2

3

4

5

Date

Magnitude

Tail #9 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 73 
 

 

Figure A.9.2.—Tail Number 9 Plots of DA1 per Date, Acquisition and Regime

2007 2008 2009 2010 2011

0

10

20

30

40

50

60

Date

Magnitude

Tail #9 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

10

20

30

40

50

60

Acquisition

Magnitude

Tail #9 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2007 2008 2009 2010 2011

0

10

20

30

40

50

60

Date

Magnitude

Tail #9 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 74 
 

 

Figure A.9.3.—Tail Number 9 Plots of SI1 per Date, Acquisition and Regime

2007 2008 2009 2010 2011

0

1

2

3

4

5

6

Date

Magnitude

Tail #9 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

1

2

3

4

5

6

Acquisition

Magnitude

Tail #9 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2007 2008 2009 2010 2011

0

1

2

3

4

5

6

Date

Magnitude

Tail #9 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 75 
 

 

Figure A.9.4.—Tail Number 9 Plots of SI3 per Date, Acquisition and Regime

2007 2008 2009 2010 2011

0

0.5

1

1.5

2

2.5

3

3.5

4

Date

Magnitude

Tail #9 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

0.5

1

1.5

2

2.5

3

3.5

4

Acquisition

Magnitude

Tail #9 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2007 2008 2009 2010 2011

0

0.5

1

1.5

2

2.5

3

3.5

4

Date

Magnitude

Tail #9 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 76 
 

Figure A.9.5.—Tail Number 9 Plots of DiffDA1 per Date, Acquisition and Regime

2007 2008 2009 2010 2011

0

5

10

15

20

25

30

Date

Magnitude

Tail #9 DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

0 50 100 150 200 250 300 350 400 450

0

5

10

15

20

25

30

Acquisition

Magnitude

Tail #9 DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

2007 2008 2009 2010 2011

0

5

10

15

20

25

30

Date

Magnitude

Tail #9 DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 77 
 

 

Figure A.9.6.—Tail Number 9 Plots of DP2P per Date, Acquisition and Regime

2007 2008 2009 2010 2011

0

50

100

150

Date

Magnitude

Tail #9 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450

0

50

100

150

Acquisition

Magnitude

Tail #9 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2007 2008 2009 2010 2011

0

50

100

150

Date

Magnitude

Tail #9 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 78 
A.10 Tail Number 10 

 

Figure A.10.1.—Tail Number 10 Plots of FM4 per Date, Acquisition and Regime

2007 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #10 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 20 40 60 80 100 120 140 160 180

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #10 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #10 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 79 
 

Figure A.10.2.—Tail Number 10 Plots of DA1 per Date, Acquisition and Regime

2007 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #10 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 20 40 60 80 100 120 140 160 180

0

5

10

15

20

25

30

35

Acquisition

Magnitude

Tail #10 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2008 2009 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #10 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 80 
 

Figure A.10.3.—Tail Number 10 Plots of SI1 per Date, Acquisition and Regime

2007 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #10 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 20 40 60 80 100 120 140 160 180

0

1

2

3

4

5

6

7

Acquisition

Magnitude

Tail #10 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2008 2009 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #10 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 81 
 

Figure A.10.4.—Tail Number 10 Plots of SI3 per Date, Acquisition and Regime

2007 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #10 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 20 40 60 80 100 120 140 160 180

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #10 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #10 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 82 
 

Figure A.10.5.—Tail Number 10 Plots of DiffDA1 per Date, Acquisition and Regime

2007 2010

0

5

10

15

20

25

Date

Magnitude

Tail #10 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 20 40 60 80 100 120 140 160 180

0

5

10

15

20

25

Acquisition

Magnitude

Tail #10 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2008 2009 2010

0

5

10

15

20

25

Date

Magnitude

Tail #10 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 83 
 

Figure A.10.6.—Tail Number 10 Plots of DP2P per Date, Acquisition and Regime

2007 2010

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #10 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 20 40 60 80 100 120 140 160 180

0

20

40

60

80

100

120

140

Acquisition

Magnitude

Tail #10 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2008 2009 2010

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #10 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 84 
A.11 Tail Number 11 

 

Figure A.11.1.—Tail Number 11 Plots of FM4 per Date, Acquisition and Regime

2007 2008 2009 2010

0

1

2

3

4

5

Date

Magnitude

Tail #11 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

1

2

3

4

5

Acquisition

Magnitude

Tail #11 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2007 2010

0

1

2

3

4

5

Date

Magnitude

Tail #11 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 85 
 

Figure A.11.2.—Tail Number 11 Plots of DA1 per Date, Acquisition and Regime

2007 2010

0

10

20

30

40

50

60

70

80

90

Date

Magnitude

Tail #11 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

10

20

30

40

50

60

70

80

90

Acquisition

Magnitude

Tail #11 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2007 2010

0

10

20

30

40

50

60

70

80

90

Date

Magnitude

Tail #11 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 86 
 

Figure A.11.3.—Tail Number 11 Plots of SI1 per Date, Acquisition and Regime

2007 2010

0

2

4

6

8

10

12

14

Date

Magnitude

Tail #11 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

2

4

6

8

10

12

14

Acquisition

Magnitude

Tail #11 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2007 2010

0

2

4

6

8

10

12

14

Date

Magnitude

Tail #11 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 87 
 

Figure A.11.4.—Tail Number 11 Plots of SI3 per Date, Acquisition and Regime

2007 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #11 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

1

2

3

4

5

6

7

Acquisition

Magnitude

Tail #11 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2007 2010

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #11 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 88 
 

Figure A.11.5.—Tail Number 11 Plots of DiffDA1 per Date, Acquisition and Regime

2007 2010

0

2

4

6

8

10

12

14

16

18

Date

Magnitude

Tail #11 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

2

4

6

8

10

12

14

16

18

Acquisition

Magnitude

Tail #11 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2007 2010

0

2

4

6

8

10

12

14

16

18

Date

Magnitude

Tail #11 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 89 
 

Figure A.11.6.—Tail Number 11 Plots of DP2P per Date, Acquisition and Regime

2007 2010

0

20

40

60

80

100

120

Date

Magnitude

Tail #11 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

20

40

60

80

100

120

Acquisition

Magnitude

Tail #11 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2007 2010

0

20

40

60

80

100

120

Date

Magnitude

Tail #11 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 90 
A.12 Tail Number 12 

 

Figure A.12.1.—Tail Number 12 Plots of FM4 per Date and Acquisition

2005 2006 2007 2008 2009 2010

0

0.5

1

1.5

2

2.5

3

3.5

4

Date

Magnitude

Tail #12 FM4 per Date at FPG100

GL FM4 CI (FPG100)

PL FM4 CI (FPG100)

GR FM4 CI (FPG100)

PR FM4 CI (FPG100)

Maintenance

0 20 40 60 80 100 120 140

0

0.5

1

1.5

2

2.5

3

3.5

4

Acquisition

Magnitude

Tail #12 FM4 per Acquisition at FPG100

GL FM4 CI (FPG100)

PL FM4 CI (FPG100)

GR FM4 CI (FPG100)

PR FM4 CI (FPG100)

Maintenance

NASA/TM—2014-218406 91 
Acquisition

Figure A.12.2.—Tail Number 12 Plots of DA1 per Date and Acquisition

2008 2009 2010

0

5

10

15

20

Date

Magnitude

Tail #12 DA1 per Date at FPG100

GL DA1 CI (FPG100)

PL DA1 CI (FPG100)

GR DA1 CI (FPG100)

PR DA1 CI (FPG100)

Maintenance

0 20 40 60 80 100 120

0

5

10

15

20

Magnitude

Tail #12 DA1 per Acquisition at FPG100

GL DA1 CI (FPG100)

PL DA1 CI (FPG100)

GR DA1 CI (FPG100)

PR DA1 CI (FPG100)

Maintenance

NASA/TM—2014-218406 92 
Figure A.12.3.—Tail Number 12 Plots of SI1 per Date and Acquisition

 

2008 2009 2010

0

1

2

3

4

5

Date

Magnitude

Tail #12 SI1 per Date at FPG100

GL SI1st CI (FPG100)

PL SI1st CI (FPG100)

GR SI1st CI (FPG100)

PR SI1st CI (FPG100)

Maintenance

0 20 40 60 80 100 120

0

1

2

3

4

5

Acquisition

Magnitude

Tail #12 SI1 per Acquisition at FPG100

GL SI1st CI (FPG100)

PL SI1st CI (FPG100)

GR SI1st CI (FPG100)

PR SI1st CI (FPG100)

Maintenance

NASA/TM—2014-218406 93 
Figure A.12.4.—Tail Number 12 Plots of SI3 per Date and Acquisition

2008 2009 2010

0

0.5

1

1.5

2

2.5

Date

Magnitude

Tail #12 SI3 per Date at FPG100

GL SI3rd CI (FPG100)

PL SI3rd CI (FPG100)

GR SI3rd CI (FPG100)

PR SI3rd CI (FPG100)

Maintenance

0 20 40 60 80 100 120

0

0.5

1

1.5

2

2.5

Acquisition

Magnitude

Tail #12 SI3 per Acquisition at FPG100

GL SI3rd CI (FPG100)

PL SI3rd CI (FPG100)

GR SI3rd CI (FPG100)

PR SI3rd CI (FPG100)

Maintenance

NASA/TM—2014-218406 94 
 

Figure A.12.5.—Tail Number 12 Plots of DiffDA1 per Date and Acquisition

 

2008 2009 2010

0

2

4

6

8

10

Date

Magnitude

Tail #12 Diff DA1 per Date at FPG100

GL DiffDA1 CI (FPG100)

PL DiffDA1 CI (FPG100)

GR DiffDA1 CI (FPG100)

PR DiffDA1 CI (FPG100)

Maintenance

0 20 40 60 80 100 120

0

2

4

6

8

10

Acquisition

Magnitude

Tail #12 Diff DA1 per Acquisition at FPG100

GL DiffDA1 CI (FPG100)

PL DiffDA1 CI (FPG100)

GR DiffDA1 CI (FPG100)

PR DiffDA1 CI (FPG100)

Maintenance

NASA/TM—2014-218406 95 
 

Figure A.12.6.—Tail Number 12 Plots of DP2P per Date and Acquisition

2008 2009 2010

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #12 Diff P2P per Date at FPG100

GL DP2P CI (FPG100)

PL DP2P CI (FPG100)

GR DP2P CI (FPG100)

PR DP2P CI (FPG100)

Maintenance

0 20 40 60 80 100 120

0

5

10

15

20

25

30

35

40

45

Acquisition

Magnitude

Tail #12 Diff P2P per Acquisition at FPG100

GL DP2P CI (FPG100)

PL DP2P CI (FPG100)

GR DP2P CI (FPG100)

PR DP2P CI (FPG100)

Maintenance

NASA/TM—2014-218406 96 
A.13 Tail Number 13 

 

Figure A.13.1.—Tail Number 13 Plots of FM4 per Date, Acquisition and Regime

2009 2010 2011

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #13 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

1

2

3

4

5

6

7

8

Acquisition

Magnitude

Tail #13 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2009 2010 2011

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #13 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 97 
 

Figure A.13.2.—Tail Number 13 Plots of DA1 per Date, Acquisition and Regime

2009 2010 2011

0

20

40

60

80

100

120

140

160

Date

Magnitude

Tail #13 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

20

40

60

80

100

120

140

160

Acquisition

Magnitude

Tail #13 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2009 2010 2011

0

20

40

60

80

100

120

140

160

Date

Magnitude

Tail #13 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 98 
 

Figure A.13.3.—Tail Number 13 Plots of SI1 per Date, Acquisition and Regime

2009 2010 2011

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #13 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

5

10

15

20

25

30

35

Acquisition

Magnitude

Tail #13 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2009 2010 2011

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #13 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 99 
 

Figure A.13.4.—Tail Number 13 Plots of SI3 per Date, Acquisition and Regime

2009 2010 2011

0

5

10

15

Date

Magnitude

Tail #13 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

5

10

15

Acquisition

Magnitude

Tail #13 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2009 2010 2011

0

5

10

15

Date

Magnitude

Tail #13 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 100 
 

 

Figure A.13.5.—Tail Number 13 Plots of DiffDA1 per Date, Acquisition and Regime

2009 2010 2011

0

20

40

60

80

100

120

140

160

Date

Magnitude

Tail #13 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

20

40

60

80

100

120

140

160

Acquisition

Magnitude

Tail #13 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2009 2010 2011

0

20

40

60

80

100

120

140

160

Date

Magnitude

Tail #13 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 101 
 

 

Figure A.13.6.—Tail Number 13 Plots of DP2P per Date, Acquisition and Regime

2009 2010 2011

0

100

200

300

400

500

600

700

800

900

Date

Magnitude

Tail #13 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 10 20 30 40 50 60 70 80 90

0

100

200

300

400

500

600

700

800

900

Acquisition

Magnitude

Tail #13 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2009 2010 2011

0

100

200

300

400

500

600

700

800

900

Date

Magnitude

Tail #13 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 102 
A.14 Tail Number 14 

 

Figure A.14.1.—Tail Number 14 Plots of FM4 per Date, Acquisition and Regime

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

1

2

3

4

5

Date

Magnitude

Tail #14 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

1

2

3

4

5

Acquisition

Magnitude

Tail #14 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

1

2

3

4

5

Date

Magnitude

Tail #14 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 103 
 

Figure A.14.2.—Tail Number 14 Plots of DA1 per Date, Acquisition and Regime

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

50

100

150

200

250

Date

Magnitude

Tail #14 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

50

100

150

200

250

Acquisition

Magnitude

Tail #14 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

50

100

150

200

250

Date

Magnitude

Tail #14 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 104 
 

Figure A.14.3.—Tail Number 14 Plots of SI1 per Date, Acquisition and Regime

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

5

10

15

20

Date

Magnitude

Tail #14 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

5

10

15

20

Acquisition

Magnitude

Tail #14 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

5

10

15

20

Date

Magnitude

Tail #14 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 105 
 

Figure A.14.4.—Tail Number 14 Plots of SI3 per Date, Acquisition and Regime

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

2

4

6

8

10

12

14

Date

Magnitude

Tail #14 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

2

4

6

8

10

12

14

Acquisition

Magnitude

Tail #14 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

2

4

6

8

10

12

14

Date

Magnitude

Tail #14 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 106 
 

Figure A.14.5.—Tail Number 14 Plots of DiffDA1 per Date, Acquisition and Regime

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #14 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

5

10

15

20

25

30

35

40

45

Acquisition

Magnitude

Tail #14 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

5

10

15

20

25

30

35

40

45

Date

Magnitude

Tail #14 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 107 
 

Figure A.14.6.—Tail Number 14 Plots of DP2P per Date, Acquisition and Regime

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

50

100

150

200

250

300

Date

Magnitude

Tail #14 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

50

100

150

200

250

300

Acquisition

Magnitude

Tail #14 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

Q3-08 Q4-08 Q1-09 Q2-09 Q3-09 Q4-09 Q1-10

0

50

100

150

200

250

300

Date

Magnitude

Tail #14 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 108 
A.15 Tail Number 15 

Figure A.15.1.—Tail Number 15 Plots of FM4 per Date and Acquisition

 

2005 2006 2007 2008 2009 2010 2011 2012

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Date

Magnitude

Tail #15 FM4 per Date at FPG100

GL FM4 CI (FPG100)

PL FM4 CI (FPG100)

GR FM4 CI (FPG100)

PR FM4 CI (FPG100)

Maintenance

0 20 40 60 80 100 120 140 160 180 200

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Acquisition

Magnitude

Tail #15 FM4 per Acquisition at FPG100

GL FM4 CI (FPG100)

PL FM4 CI (FPG100)

GR FM4 CI (FPG100)

PR FM4 CI (FPG100)

Maintenance

NASA/TM—2014-218406 109 
Figure A.15.2.—Tail Number 15 Plots of DA1 per Date and Acquisition

2008 2009 2010 2011 2012

0

10

20

30

40

50

60

70

80

90

Date

Magnitude

Tail #15 DA1 per Date at FPG100

GL DA1 CI (FPG100)

PL DA1 CI (FPG100)

GR DA1 CI (FPG100)

PR DA1 CI (FPG100)

Maintenance

0 20 40 60 80 100 120 140 160

0

10

20

30

40

50

60

70

80

90

Acquisition

Magnitude

Tail #15 DA1 per Acquisition at FPG100

GL DA1 CI (FPG100)

PL DA1 CI (FPG100)

GR DA1 CI (FPG100)

PR DA1 CI (FPG100)

Maintenance

NASA/TM—2014-218406 110 
Figure A.15.3.—Tail Number 15 Plots of SI1 per Date and Acquisition

2008 2009 2010 2011 2012

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #15 SI1 per Date at FPG100

GL SI1st CI (FPG100)

PL SI1st CI (FPG100)

GR SI1st CI (FPG100)

PR SI1st CI (FPG100)

Maintenance

0 20 40 60 80 100 120 140 160

0

1

2

3

4

5

6

7

8

Acquisition

Magnitude

Tail #15 SI1 per Acquisition at FPG100

GL SI1st CI (FPG100)

PL SI1st CI (FPG100)

GR SI1st CI (FPG100)

PR SI1st CI (FPG100)

Maintenance

NASA/TM—2014-218406 111 
Figure A.15.4.—Tail Number 15 Plots of SI3 per Date and Acquisition

2008 2009 2010 2011 2012

0

1

2

3

4

5

6

7

Date

Magnitude

Tail #15 SI3 per Date at FPG100

GL SI3rd CI (FPG100)

PL SI3rd CI (FPG100)

GR SI3rd CI (FPG100)

PR SI3rd CI (FPG100)

Maintenance

0 20 40 60 80 100 120 140 160

0

1

2

3

4

5

6

7

Acquisition

Magnitude

Tail #15 SI3 per Acquisition at FPG100

GL SI3rd CI (FPG100)

PL SI3rd CI (FPG100)

GR SI3rd CI (FPG100)

PR SI3rd CI (FPG100)

Maintenance

NASA/TM—2014-218406 112 
Figure A.15.5.—Tail Number 15 Plots of DiffDA1 per Date and Acquisition

2008 2009 2010 2011 2012

0

5

10

15

20

25

Date

Magnitude

Tail #15 Diff DA1 per Date at FPG100

GL DiffDA1 CI (FPG100)

PL DiffDA1 CI (FPG100)

GR DiffDA1 CI (FPG100)

PR DiffDA1 CI (FPG100)

Maintenance

0 20 40 60 80 100 120 140 160

0

5

10

15

20

25

Acquisition

Magnitude

Tail #15 Diff DA1 per Acquisition at FPG100

GL DiffDA1 CI (FPG100)

PL DiffDA1 CI (FPG100)

GR DiffDA1 CI (FPG100)

PR DiffDA1 CI (FPG100)

Maintenance

NASA/TM—2014-218406 113 
Figure A.15.6.—Tail Number 15 Plots of DP2P per Date and Acquisition

2008 2009 2010 2011 2012

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #15 Diff P2P per Date at FPG100

GL DP2P CI (FPG100)

PL DP2P CI (FPG100)

GR DP2P CI (FPG100)

PR DP2P CI (FPG100)

Maintenance

0 20 40 60 80 100 120 140 160

0

20

40

60

80

100

120

140

Acquisition

Magnitude

Tail #15 Diff P2P per Acquisition at FPG100

GL DP2P CI (FPG100)

PL DP2P CI (FPG100)

GR DP2P CI (FPG100)

PR DP2P CI (FPG100)

Maintenance

NASA/TM—2014-218406 114 
A.16 Tail Number 16 

 

Figure A.16.1.—Tail Number 16 Plots of FM4 per Date, Acquisition and Regime

2008 2009 2010

0

1

2

3

4

5

Date

Magnitude

Tail #16 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

1

2

3

4

5

Acquisition

Magnitude

Tail #16 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2008 2009 2010

0

1

2

3

4

5

Date

Magnitude

Tail #16 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 115 
 

Figure A.16.2.—Tail Number 16 Plots of DA1 per Date, Acquisition and Regime

2008 2009 2010

0

50

100

150

Date

Magnitude

Tail #16 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

50

100

150

Acquisition

Magnitude

Tail #16 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2008 2009 2010

0

50

100

150

Date

Magnitude

Tail #16 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

NASA/TM—2014-218406 116 
 

Figure A.16.3.—Tail Number 16 Plots of SI1 per Date, Acquisition and Regime

2008 2009 2010

0

2

4

6

8

10

12

14

16

18

Date

Magnitude

Tail #16 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

2

4

6

8

10

12

14

16

18

Acquisition

Magnitude

Tail #16 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2008 2009 2010

0

2

4

6

8

10

12

14

16

18

Date

Magnitude

Tail #16 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 117 
 

Figure A.16.4.—Tail Number 16 Plots of SI3 per Date, Acquisition and Regime

2008 2009 2010

0

2

4

6

8

10

Date

Magnitude

Tail #16 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

2

4

6

8

10

Acquisition

Magnitude

Tail #16 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2008 2009 2010

0

2

4

6

8

10

Date

Magnitude

Tail #16 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 118 
 

Figure A.16.5.—Tail Number 16 Plots of DiffDA1 per Date, Acquisition and Regime

2008 2009 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #16 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

5

10

15

20

25

30

35

Acquisition

Magnitude

Tail #16 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2008 2009 2010

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #16 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 119 
 

Figure A.16.6.—Tail Number 16 Plots of DP2P per Date, Acquisition and Regime

2008 2009 2010

0

50

100

150

200

250

Date

Magnitude

Tail #16 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700

0

50

100

150

200

250

Acquisition

Magnitude

Tail #16 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2008 2009 2010

0

50

100

150

200

250

Date

Magnitude

Tail #16 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 120 
A.17 Tail Number 17 

 

 

Figure A.17.1.—Tail Number 17 Plots of FM4 per Date, Acquisition and Regime

2010 2012

0

1

2

3

4

5

Date

Magnitude

Tail #17 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

1

2

3

4

5

Acquisition

Magnitude

Tail #17 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2010 2012

0

1

2

3

4

5

Date

Magnitude

Tail #17 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 121 
 

 

Figure A.17.2.—Tail Number 17 Plots of DA1 per Date, Acquisition and Regime

2010 2012

0

20

40

60

80

100

Date

Magnitude

Tail #17 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

20

40

60

80

100

Acquisition

Magnitude

Tail #17 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2010 2012

0

20

40

60

80

100

Date

Magnitude

Tail #17 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 122 
 

 

Figure A.17.3.—Tail Number 17 Plots of SI1 per Date, Acquisition and Regime

2010 2012

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #17 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

5

10

15

20

25

30

35

Acquisition

Magnitude

Tail #17 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2010 2012

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #17 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 123 
 

 

Figure A.17.4.—Tail Number 17 Plots of SI3 per Date, Acquisition and Regime

2010 2012

0

2

4

6

8

10

12

14

16

Date

Magnitude

Tail #17 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

2

4

6

8

10

12

14

16

Acquisition

Magnitude

Tail #17 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2010 2012

0

2

4

6

8

10

12

14

16

Date

Magnitude

Tail #17 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 124 
 

 

Figure A.17.5.—Tail Number 17 Plots of DiffDA1 per Date, Acquisition and Regime

2010 2012

0

10

20

30

40

50

60

70

80

90

Date

Magnitude

Tail #17 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

10

20

30

40

50

60

70

80

90

Acquisition

Magnitude

Tail #17 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2010 2012

0

10

20

30

40

50

60

70

80

90

Date

Magnitude

Tail #17 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 125 
 

 

Figure A.17.6.—Tail Number 17 Plots of DP2P per Date, Acquisition and Regime

2010 2012

0

50

100

150

200

250

300

350

400

Date

Magnitude

Tail #17 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 100 200 300 400 500 600 700 800

0

50

100

150

200

250

300

350

400

Acquisition

Magnitude

Tail #17 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2010 2012

0

50

100

150

200

250

300

350

400

Date

Magnitude

Tail #17 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 126 
A.18 Tail Number 18 

 

Figure A.18.1.—Tail Number 18 Plots of FM4 per Date, Acquisition and Regime

2009 2010 2011 2012 2013

0

1

2

3

4

5

Date

Magnitude

Tail #18 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

1

2

3

4

5

Acquisition

Magnitude

Tail #18 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

1

2

3

4

5

Date

Magnitude

Tail #18 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 127 
 

Figure A.18.2.—Tail Number 18 Plots of DA1 per Date, Acquisition and Regime

2009 2010 2011 2012 2013

0

10

20

30

40

50

60

70

Date

Magnitude

Tail #18 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

10

20

30

40

50

60

70

Acquisition

Magnitude

Tail #18 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

10

20

30

40

50

60

70

Date

Magnitude

Tail #18 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 128 
 

Figure A.18.3.—Tail Number 18 Plots of SI1 per Date, Acquisition and Regime

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

2

4

6

8

10

Acquisition

Magnitude

Tail #18 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 129 
 

Figure A.18.4.—Tail Number 18 Plots of SI3 per Date, Acquisition and Regime

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

2

4

6

8

10

Acquisition

Magnitude

Tail #18 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

2

4

6

8

10

Date

Magnitude

Tail #18 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 130 
 

Figure A.18.5.—Tail Number 18 Plots of DiffDA1 per Date, Acquisition and Regime

2009 2010 2011 2012 2013

0

5

10

15

20

25

Date

Magnitude

Tail #18 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

5

10

15

20

25

Acquisition

Magnitude

Tail #18 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

5

10

15

20

25

Date

Magnitude

Tail #18 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 131 
 

Figure A.18.6.—Tail Number 18 Plots of DP2P per Date, Acquisition and Regime

2009 2010 2011 2012 2013

0

20

40

60

80

100

120

140

160

180

Date

Magnitude

Tail #18 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

20

40

60

80

100

120

140

160

180

Acquisition

Magnitude

Tail #18 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2009 2010 2011 2012 2013

0

20

40

60

80

100

120

140

160

180

Date

Magnitude

Tail #18 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 132 
A.19 Tail Number 19 

 

Figure A.19.1.—Tail Number 19 Plots of FM4 per Date, Acquisition and Regime

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

1

2

3

4

5

Date

Magnitude

Tail #19 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

1

2

3

4

5

Acquisition

Magnitude

Tail #19 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

1

2

3

4

5

Date

Magnitude

Tail #19 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 133 
 

Figure A.19.2.—Tail Number 19 Plots of DA1 per Date, Acquisition and Regime

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #19 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

5

10

15

20

25

30

35

Acquisition

Magnitude

Tail #19 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

5

10

15

20

25

30

35

Date

Magnitude

Tail #19 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 134 
 

Figure A.19.3.—Tail Number 19 Plots of SI1 per Date, Acquisition and Regime

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #19 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

1

2

3

4

5

6

7

8

Acquisition

Magnitude

Tail #19 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

1

2

3

4

5

6

7

8

Date

Magnitude

Tail #19 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 135 
 

Figure A.19.4.—Tail Number 19 Plots of SI3 per Date, Acquisition and Regime

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

1

2

3

4

5

Date

Magnitude

Tail #19 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

1

2

3

4

5

Acquisition

Magnitude

Tail #19 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

1

2

3

4

5

Date

Magnitude

Tail #19 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 136 
 

Figure A.19.5.—Tail Number 19 Plots of DiffDA1 per Date, Acquisition and Regime

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

5

10

15

Date

Magnitude

Tail #19 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

5

10

15

Acquisition

Magnitude

Tail #19 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

5

10

15

Date

Magnitude

Tail #19 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 137 
 

Figure A.19.6.—Tail Number 19 Plots of DP2P per Date, Acquisition and Regime

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #19 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

10

20

30

40

50

60

70

80

Acquisition

Magnitude

Tail #19 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

Q3-10 Q4-10 Q1-11 Q2-11 Q3-11 Q4-11 Q1-12 Q2-12

0

10

20

30

40

50

60

70

80

Date

Magnitude

Tail #19 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 138 
A.20 Tail Number 20 

 

Figure A.20.1.—Tail Number 20 Plots of FM4 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010 2011 2012

0

2

4

6

8

10

Date

Magnitude

Tail #20 FM4 per Date at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

0 50 100 150 200 250 300 350 400 450 500

0

2

4

6

8

10

Acquisition

Magnitude

Tail #20 FM4 per Acquisition at FPG101

GL FM4 CI (FPG101)

PL FM4 CI (FPG101)

GR FM4 CI (FPG101)

PR FM4 CI (FPG101)

Maintenance

2008 2009 2010 2011 2012

0

2

4

6

8

10

Date

Magnitude

Tail #20 FM4 per Date at 120KTA

GL FM4 CI (120KTA)

PL FM4 CI (120KTA)

GR FM4 CI (120KTA)

PR FM4 CI (120KTA)

Maintenance

NASA/TM—2014-218406 139 
 

Figure A.20.2.—Tail Number 20 Plots of DA1 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010 2011 2012

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #20 DA1 per Date at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

20

40

60

80

100

120

140

Acquisition

Magnitude

Tail #20 DA1 per Acquisition at FPG101

GL DA1 CI (FPG101)

PL DA1 CI (FPG101)

GR DA1 CI (FPG101)

PR DA1 CI (FPG101)

Maintenance

2008 2009 2010 2011 2012

0

20

40

60

80

100

120

140

Date

Magnitude

Tail #20 DA1 per Date at 120KTA

GL DA1 CI (120KTA)

PL DA1 CI (120KTA)

GR DA1 CI (120KTA)

PR DA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 140 
 

Figure A.20.3.—Tail Number 20 Plots of SI1 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010 2011 2012

0

5

10

15

20

25

Date

Magnitude

Tail #20 SI1 per Date at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

5

10

15

20

25

Acquisition

Magnitude

Tail #20 SI1 per Acquisition at FPG101

GL SI1st CI (FPG101)

PL SI1st CI (FPG101)

GR SI1st CI (FPG101)

PR SI1st CI (FPG101)

Maintenance

2008 2009 2010 2011 2012

0

5

10

15

20

25

Date

Magnitude

Tail #20 SI1 per Date at 120KTA

GL SI1st CI (120KTA)

PL SI1st CI (120KTA)

GR SI1st CI (120KTA)

PR SI1st CI (120KTA)

Maintenance

NASA/TM—2014-218406 141 
 

Figure A.20.4.—Tail Number 20 Plots of SI3 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010 2011 2012

0

2

4

6

8

10

12

Date

Magnitude

Tail #20 SI3 per Date at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

2

4

6

8

10

12

Acquisition

Magnitude

Tail #20 SI3 per Acquisition at FPG101

GL SI3rd CI (FPG101)

PL SI3rd CI (FPG101)

GR SI3rd CI (FPG101)

PR SI3rd CI (FPG101)

Maintenance

2008 2009 2010 2011 2012

0

2

4

6

8

10

12

Date

Magnitude

Tail #20 SI3 per Date at 120KTA

GL SI3rd CI (120KTA)

PL SI3rd CI (120KTA)

GR SI3rd CI (120KTA)

PR SI3rd CI (120KTA)

Maintenance

NASA/TM—2014-218406 142 
 

Figure A.20.5.—Tail Number 20 Plots of DiffDA1 per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010 2011 2012

0

10

20

30

40

50

60

70

Date

Magnitude

Tail #20 Diff DA1 per Date at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

10

20

30

40

50

60

70

Acquisition

Magnitude

Tail #20 Diff DA1 per Acquisition at FPG101

GL DiffDA1 CI (FPG101)

PL DiffDA1 CI (FPG101)

GR DiffDA1 CI (FPG101)

PR DiffDA1 CI (FPG101)

Maintenance

2008 2009 2010 2011 2012

0

10

20

30

40

50

60

70

Date

Magnitude

Tail #20 Diff DA1 per Date at 120KTA

GL DiffDA1 CI (120KTA)

PL DiffDA1 CI (120KTA)

GR DiffDA1 CI (120KTA)

PR DiffDA1 CI (120KTA)

Maintenance

NASA/TM—2014-218406 143 
 

Figure A.20.6.—Tail Number 20 Plots of DP2P per Date, Acquisition and Regime

2005 2006 2007 2008 2009 2010 2011 2012

0

50

100

150

200

250

Date

Magnitude

Tail #20 Diff P2P per Date at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

0 100 200 300 400 500 600

0

50

100

150

200

250

Acquisition

Magnitude

Tail #20 Diff P2P per Acquisition at FPG101

GL DP2P CI (FPG101)

PL DP2P CI (FPG101)

GR DP2P CI (FPG101)

PR DP2P CI (FPG101)

Maintenance

2008 2009 2010 2011 2012

0

50

100

150

200

250

Date

Magnitude

Tail #20 Diff P2P per Date at 120KTA

GL DP2P CI (120KTA)

PL DP2P CI (120KTA)

GR DP2P CI (120KTA)

PR DP2P CI (120KTA)

Maintenance

NASA/TM—2014-218406 144 
Appendix B.—CI Statistical Parameters Before and After Replacement 

TABLE B.1.—TAIL NUMBER 1 STATISTICAL PARAMETERS—FPG101 

Location CI Name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 159 159 6.98 2.81 

PR DA1 After 160 361 201 15.35 4.62 

GR DA1 Before 1 162 162 6.61 2.53 

GR DA1 After 163 364 201 14.66 5.13 

PL DA1 Before 1 159 159 17.63 6.51 

PL DA1 After 160 363 203 12.34 5.59 

GL DA1 Before 1 159 159 8.22 1.99 

GL DA1 After 160 363 203 11.68 5.84 

PR FM4 Before 1 160 160 2.97 0.41 

PR FM4 After 161 362 201 3.00 0.36 

GR FM4 Before 1 4 4 2.97 0.13 

GR FM4 After 5 206 201 2.93 0.25 

PL FM4 Before 1 160 160 2.15 0.21 

PL FM4 After 161 364 203 2.67 0.27 

GL FM4 Before 1 160 160 4.40 1.04 

GL FM4 After 161 364 203 2.96 0.24 

PR SI1st Before 1 159 159 1.48 0.86 

PR SI1st After 160 361 201 2.79 0.58 

GR SI1st Before 1 162 162 0.95 0.60 

GR SI1st After 163 364 201 2.41 0.72 

PL SI1st Before 1 159 159 1.51 0.94 

PL SI1st After 160 363 203 2.25 0.86 

GL SI1st Before 1 159 159 0.79 0.42 

GL SI1st After 160 363 203 1.47 0.66 

PR SI3rd Before 1 159 159 0.77 0.37 

PR SI3rd After 160 361 201 1.58 0.27 

GR SI3rd Before 1 162 162 0.94 0.47 

GR SI3rd After 163 364 201 1.84 0.58 

PL SI3rd Before 1 159 159 0.97 0.45 

PL SI3rd After 160 363 203 1.79 0.47 

GL SI3rd Before 1 159 159 0.81 0.33 

GL SI3rd After 160 363 203 1.74 0.42 

PR DiffDA1 Before 1 159 159 1.60 0.54 

PR DiffDA1 After 160 361 201 5.00 0.78 

GR DiffDA1 Before 1 162 162 2.39 0.97 

GR DiffDA1 After 163 364 201 4.05 0.90 

PL DiffDA1 Before 1 159 159 16.06 6.79 

PL DiffDA1 After 160 363 203 5.72 0.65 

GL DiffDA1 Before 1 159 159 5.42 1.48 

GL DiffDA1 After 160 363 203 4.99 0.81 

PR DP2P Before 1 159 159 8.69 3.12 

PR DP2P After 160 361 201 27.96 4.43 

GR DP2P Before 1 162 162 13.71 5.80 

GR DP2P After 163 364 201 23.97 5.80 

PL DP2P Before 1 159 159 65.52 25.37 

PL DP2P After 160 363 203 29.21 4.42 

GL DP2P Before 1 159 159 40.81 15.61 

GL DP2P After 160 363 203 29.25 4.82 

NASA/TM—2014-218406 145 
TABLE B.2.—TAIL NUMBER 2 STATISTICAL PARAMETERS 

(a) Number 2—FPG101 

Location CI Name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 120 120 14.88 6.15 

PR DA1 After 121 493 372 9.12 1.87 

GR DA1 Before 1 120 120 14.87 6.60 

GR DA1 After 121 493 372 5.09 2.68 

PL DA1 Before 1 375 375 18.12 11.24 

PL DA1 After 376 763 387 19.47 5.79 

GL DA1 Before 1 375 375 18.13 11.01 

GL DA1 After 376 764 388 20.64 5.64 

PR FM4 Before 1 196 196 2.69 0.41 

PR FM4 After 197 569 372 1.73 0.14 

GR FM4 Before 1 196 196 2.78 0.23 

GR FM4 After 197 566 369 2.91 0.22 

PL FM4 Before 1 451 451 2.39 0.35 

PL FM4 After 452 834 382 2.76 0.27 

GL FM4 Before 1 451 451 2.84 0.23 

GL FM4 After 452 834 382 2.85 0.22 

PR SI1st Before 1 120 120 1.34 0.58 

PR SI1st After 121 493 372 0.74 0.41 

GR SI1st Before 1 120 120 1.56 0.77 

GR SI1st After 121 493 372 0.73 0.28 

PL SI1st Before 1 375 375 1.56 0.75 

PL SI1st After 376 763 387 1.56 0.66 

GL SI1st Before 1 375 375 2.33 0.65 

GL SI1st After 376 764 388 4.14 1.52 

PR SI3rd Before 1 120 120 0.86 0.29 

PR SI3rd After 121 493 372 0.43 0.18 

GR SI3rd Before 1 120 120 1.71 0.75 

GR SI3rd After 121 493 372 0.65 0.16 

PL SI3rd Before 1 375 375 1.05 0.39 

PL SI3rd After 376 763 387 1.00 0.25 

GL SI3rd Before 1 375 375 1.92 0.33 

GL SI3rd After 376 764 388 2.48 0.49 

PR DiffDA1 Before 1 120 120 4.93 2.12 

PR DiffDA1 After 121 493 372 7.82 1.22 

GR DiffDA1 Before 1 120 120 6.36 3.34 

GR DiffDA1 After 121 493 372 3.03 0.42 

PL DiffDA1 Before 1 375 375 7.55 2.04 

PL DiffDA1 After 376 763 387 4.90 0.56 

GL DiffDA1 Before 1 375 375 7.28 1.40 

GL DiffDA1 After 376 764 388 6.70 0.84 

PR DP2P Before 1 120 120 25.00 10.57 

PR DP2P After 121 493 372 29.13 4.05 

GR DP2P Before 1 120 120 35.76 17.04 

GR DP2P After 121 493 372 18.21 2.96 

PL DP2P Before 1 375 375 36.78 10.64 

PL DP2P After 376 763 387 26.27 3.67 

GL DP2P Before 1 375 375 41.78 9.00 

GL DP2P After 376 764 388 38.47 4.89 

NASA/TM—2014-218406 146 
TABLE B.2.—CONCLUDED 

(b) Number 2—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 118 118 11.82 2.80 

PR DA1 After 119 271 152 14.47 2.54 

GR DA1 Before 1 118 118 12.21 3.10 

GR DA1 After 119 271 152 12.94 2.91 

PL DA1 Before 1 274 274 50.24 11.74 

PL DA1 After 275 430 155 27.11 10.75 

GL DA1 Before 1 274 274 49.85 11.75 

GL DA1 After 275 430 155 27.63 10.45 

PR FM4 Before 1 118 118 2.80 0.36 

PR FM4 After 119 271 152 2.05 0.12 

GR FM4 Before 1 118 118 3.13 0.35 

GR FM4 After 119 271 152 3.20 0.28 

PL FM4 Before 1 274 274 2.98 0.28 

PL FM4 After 275 430 155 2.77 0.30 

GL FM4 Before 1 274 274 2.77 0.13 

GL FM4 After 275 430 155 2.91 0.18 

PR SI1st Before 1 118 118 2.40 0.56 

PR SI1st After 119 271 152 1.40 0.34 

GR SI1st Before 1 118 118 1.42 0.61 

GR SI1st After 119 271 152 1.38 0.27 

PL SI1st Before 1 274 274 2.07 1.18 

PL SI1st After 275 430 155 2.42 1.26 

GL SI1st Before 1 274 274 3.21 1.21 

GL SI1st After 275 430 155 4.13 1.61 

PR SI3rd Before 1 118 118 1.37 0.24 

PR SI3rd After 119 271 152 0.83 0.16 

GR SI3rd Before 1 118 118 1.51 0.48 

GR SI3rd After 119 271 152 0.99 0.15 

PL SI3rd Before 1 274 274 1.50 0.72 

PL SI3rd After 275 430 155 1.53 0.41 

GL SI3rd Before 1 274 274 2.32 0.55 

GL SI3rd After 275 430 155 2.46 0.45 

PR DiffDA1 Before 1 118 118 5.08 1.38 

PR DiffDA1 After 119 271 152 7.26 0.79 

GR DiffDA1 Before 1 118 118 6.20 2.11 

GR DiffDA1 After 119 271 152 3.69 0.25 

PL DiffDA1 Before 1 274 274 13.80 2.27 

PL DiffDA1 After 275 430 155 6.61 1.08 

GL DiffDA1 Before 1 274 274 12.01 1.20 

GL DiffDA1 After 275 430 155 7.27 0.73 

PR DP2P Before 1 118 118 26.87 6.87 

PR DP2P After 119 271 152 31.21 2.97 

GR DP2P Before 1 118 118 39.11 12.96 

GR DP2P After 119 271 152 23.88 2.39 

PL DP2P Before 1 274 274 76.61 14.04 

PL DP2P After 275 430 155 35.44 7.11 

GL DP2P Before 1 274 274 74.67 10.57 

GL DP2P After 275 430 155 45.39 5.50 

NASA/TM—2014-218406 147 
TABLE B.3.—TAIL NUMBER 4 STATISTICAL PARAMETERS 

(a) Number 4—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 25 25 26.05 9.18 

PR DA1 After 26 445 419 27.02 7.11 

GR DA1 Before 1 25 25 26.66 9.53 

GR DA1 After 26 445 419 27.45 7.15 

PL DA1 Before 1 25 25 66.98 19.42 

PL DA1 After 26 444 418 12.18 2.19 

GL DA1 Before 1 25 25 66.66 19.74 

GL DA1 After 26 445 419 11.13 2.31 

PR FM4 Before 1 25 25 2.85 0.26 

PR FM4 After 26 444 418 2.80 0.32 

GR FM4 Before 1 25 25 2.87 0.27 

GR FM4 After 26 444 418 2.92 0.28 

PL FM4 Before 1 25 25 2.83 0.34 

PL FM4 After 26 444 418 2.91 0.29 

GL FM4 Before 1 25 25 3.01 0.34 

GL FM4 After 26 444 418 3.22 0.40 

PR SI1st Before 1 25 25 2.58 0.51 

PR SI1st After 26 445 419 2.73 0.87 

GR SI1st Before 1 25 25 3.38 1.55 

GR SI1st After 26 445 419 2.59 1.29 

PL SI1st Before 1 25 25 6.69 2.45 

PL SI1st After 26 444 418 2.02 0.62 

GL SI1st Before 1 25 25 5.68 2.00 

GL SI1st After 26 445 419 1.25 0.50 

PR SI3rd Before 1 25 25 1.34 0.21 

PR SI3rd After 26 445 419 1.51 0.33 

GR SI3rd Before 1 25 25 3.17 1.30 

GR SI3rd After 26 445 419 2.60 0.98 

PL SI3rd Before 1 25 25 4.33 1.42 

PL SI3rd After 26 444 418 1.39 0.29 

GL SI3rd Before 1 25 25 4.17 0.95 

GL SI3rd After 26 445 419 1.35 0.32 

PR DiffDA1 Before 1 25 25 5.61 0.68 

PR DiffDA1 After 26 445 419 5.54 0.59 

GR DiffDA1 Before 1 25 25 7.51 2.13 

GR DiffDA1 After 26 445 419 6.94 1.56 

PL DiffDA1 Before 1 25 25 14.17 3.32 

PL DiffDA1 After 26 444 418 6.64 1.05 

GL DiffDA1 Before 1 25 25 12.34 2.79 

GL DiffDA1 After 26 445 419 4.78 0.60 

PR DP2P Before 1 25 25 30.02 4.77 

PR DP2P After 26 445 419 29.94 4.16 

GR DP2P Before 1 25 25 42.32 10.68 

GR DP2P After 26 445 419 40.43 7.69 

PL DP2P Before 1 25 25 74.48 17.70 

PL DP2P After 26 444 418 35.43 5.63 

GL DP2P Before 1 25 25 75.34 17.94 

GL DP2P After 26 445 419 30.16 3.59 

NASA/TM—2014-218406 148 
TABLE B.3.—CONCLUDED 

(b) Number 4—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 15 15 23.15 2.94 

PR DA1 After 16 74 58 19.06 5.34 

GR DA1 Before 1 15 15 23.91 2.68 

GR DA1 After 16 74 58 19.74 5.15 

PL DA1 Before 1 15 15 81.22 4.78 

PL DA1 After 16 74 58 17.92 1.98 

GL DA1 Before 1 15 15 81.23 4.52 

GL DA1 After 16 74 58 17.68 2.07 

PR FM4 Before 1 15 15 2.53 0.17 

PR FM4 After 16 74 58 2.69 0.18 

GR FM4 Before 1 15 15 2.80 0.18 

GR FM4 After 16 74 58 3.10 0.27 

PL FM4 Before 1 15 15 2.73 0.22 

PL FM4 After 16 74 58 2.78 0.20 

GL FM4 Before 1 15 15 3.34 0.24 

GL FM4 After 16 74 58 3.04 0.19 

PR SI1st Before 1 15 15 1.35 0.38 

PR SI1st After 16 74 58 1.58 0.50 

GR SI1st Before 1 15 15 3.50 0.39 

GR SI1st After 16 74 58 2.80 0.64 

PL SI1st Before 1 15 15 5.46 1.00 

PL SI1st After 16 74 58 1.90 0.48 

GL SI1st Before 1 15 15 5.96 0.65 

GL SI1st After 16 74 58 1.78 0.61 

PR SI3rd Before 1 15 15 1.16 0.15 

PR SI3rd After 16 74 58 1.26 0.24 

GR SI3rd Before 1 15 15 4.00 0.36 

GR SI3rd After 16 74 58 3.42 0.54 

PL SI3rd Before 1 15 15 4.39 0.56 

PL SI3rd After 16 74 58 1.43 0.18 

GL SI3rd Before 1 15 15 3.48 0.26 

GL SI3rd After 16 74 58 1.75 0.36 

PR DiffDA1 Before 1 15 15 6.69 0.25 

PR DiffDA1 After 16 74 58 6.04 0.72 

GR DiffDA1 Before 1 15 15 8.59 0.81 

GR DiffDA1 After 16 74 58 7.48 1.11 

PL DiffDA1 Before 1 15 15 15.92 1.58 

PL DiffDA1 After 16 74 58 6.89 0.31 

GL DiffDA1 Before 1 15 15 12.78 0.75 

GL DiffDA1 After 16 74 58 5.99 0.63 

PR DP2P Before 1 15 15 34.83 2.23 

PR DP2P After 16 74 58 31.69 4.33 

GR DP2P Before 1 15 15 48.72 3.74 

GR DP2P After 16 74 58 47.50 6.52 

PL DP2P Before 1 15 15 84.17 10.97 

PL DP2P After 16 74 58 36.78 2.89 

GL DP2P Before 1 15 15 87.55 7.43 

GL DP2P After 16 74 58 38.69 5.35 

NASA/TM—2014-218406 149 
TABLE B.4.—TAIL NUMBER 5 STATISTICAL PARAMETERS 

(a) Number 5—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 14 14 17.55 3.95 

PR DA1 After 15 85 70 18.63 6.75 

GR DA1 Before 1 14 14 18.71 4.04 

GR DA1 After 15 85 70 19.69 6.38 

PL DA1 Before 1 14 14 38.39 7.08 

PL DA1 After 15 85 70 11.77 9.21 

GL DA1 Before 1 14 14 30.32 5.58 

GL DA1 After 15 86 71 12.36 8.81 

PR FM4 Before 1 14 14 2.96 0.26 

PR FM4 After 15 85 70 2.80 0.29 

GR FM4 Before 1 14 14 2.90 0.17 

GR FM4 After 15 85 70 2.81 0.20 

PL FM4 Before 1 14 14 2.58 0.18 

PL FM4 After 15 85 70 2.77 0.33 

GL FM4 Before 1 14 14 3.06 0.43 

GL FM4 After 15 85 70 2.78 0.18 

PR SI1st Before 1 14 14 1.57 0.47 

PR SI1st After 15 85 70 1.33 0.90 

GR SI1st Before 1 14 14 1.72 0.75 

GR SI1st After 15 85 70 1.94 0.95 

PL SI1st Before 1 14 14 7.77 1.81 

PL SI1st After 15 85 70 1.08 0.57 

GL SI1st Before 1 14 14 2.78 0.56 

GL SI1st After 15 86 71 1.37 0.63 

PR SI3rd Before 1 14 14 0.97 0.15 

PR SI3rd After 15 85 70 0.99 0.32 

GR SI3rd Before 1 14 14 1.78 0.55 

GR SI3rd After 15 85 70 1.66 0.39 

PL SI3rd Before 1 14 14 5.02 0.92 

PL SI3rd After 15 85 70 0.80 0.26 

GL SI3rd Before 1 14 14 1.99 0.37 

GL SI3rd After 15 86 71 1.28 0.29 

PR DiffDA1 Before 1 14 14 3.89 0.48 

PR DiffDA1 After 15 85 70 3.59 0.82 

GR DiffDA1 Before 1 14 14 7.28 1.02 

GR DiffDA1 After 15 85 70 6.77 0.89 

PL DiffDA1 Before 1 14 14 22.74 4.70 

PL DiffDA1 After 15 85 70 4.11 1.18 

GL DiffDA1 Before 1 14 14 7.27 0.60 

GL DiffDA1 After 15 86 71 5.08 0.87 

PR DP2P Before 1 14 14 21.59 2.64 

PR DP2P After 15 85 70 19.39 4.65 

GR DP2P Before 1 14 14 43.09 6.42 

GR DP2P After 15 85 70 39.46 5.97 

PL DP2P Before 1 14 14 109.21 21.98 

PL DP2P After 15 85 70 21.63 5.77 

GL DP2P Before 1 14 14 45.21 7.36 

GL DP2P After 15 86 71 28.36 5.80 

NASA/TM—2014-218406 150 
TABLE B.4.—CONCLUDED 

(b) Number 5—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 2 2 38.29 1.05 

PR DA1 After 3 16 13 42.25 26.77 

GR DA1 Before 1 2 2 40.47 1.39 

GR DA1 After 3 16 13 43.21 26.27 

PL DA1 Before 1 2 2 63.39 3.57 

PL DA1 After 3 16 13 29.08 13.37 

GL DA1 Before 1 2 2 48.56 2.37 

GL DA1 After 3 16 13 29.50 12.88 

PR FM4 Before 1 2 2 3.10 0.10 

PR FM4 After 3 16 13 2.98 0.46 

GR FM4 Before 1 2 2 2.65 0.06 

GR FM4 After 3 16 13 2.95 0.17 

PL FM4 Before 1 2 2 2.65 0.32 

PL FM4 After 3 16 13 2.72 0.54 

GL FM4 Before 1 2 2 2.80 0.10 

GL FM4 After 3 16 13 2.87 0.16 

PR SI1st Before 1 2 2 1.38 0.22 

PR SI1st After 3 16 13 3.39 1.49 

GR SI1st Before 1 2 2 4.23 0.83 

GR SI1st After 3 16 13 1.64 0.60 

PL SI1st Before 1 2 2 10.99 0.97 

PL SI1st After 3 16 13 1.62 0.32 

GL SI1st Before 1 2 2 4.58 1.37 

GL SI1st After 3 16 13 1.88 0.60 

PR SI3rd Before 1 2 2 0.99 0.16 

PR SI3rd After 3 16 13 1.79 0.48 

GR SI3rd Before 1 2 2 3.14 0.04 

GR SI3rd After 3 16 13 2.59 0.70 

PL SI3rd Before 1 2 2 9.56 0.22 

PL SI3rd After 3 16 13 1.14 0.17 

GL SI3rd Before 1 2 2 2.68 0.38 

GL SI3rd After 3 16 13 1.62 0.42 

PR DiffDA1 Before 1 2 2 6.65 1.11 

PR DiffDA1 After 3 16 13 6.79 2.82 

GR DiffDA1 Before 1 2 2 10.53 0.27 

GR DiffDA1 After 3 16 13 10.26 2.65 

PL DiffDA1 Before 1 2 2 39.21 2.21 

PL DiffDA1 After 3 16 13 9.24 1.72 

GL DiffDA1 Before 1 2 2 11.19 0.29 

GL DiffDA1 After 3 16 13 8.73 1.30 

PR DP2P Before 1 2 2 39.29 8.65 

PR DP2P After 3 16 13 37.12 14.22 

GR DP2P Before 1 2 2 62.92 2.06 

GR DP2P After 3 16 13 64.32 18.45 

PL DP2P Before 1 2 2 207.27 35.69 

PL DP2P After 3 16 13 48.58 7.54 

GL DP2P Before 1 2 2 66.77 0.14 

GL DP2P After 3 16 13 53.38 6.42 

NASA/TM—2014-218406 151 
TABLE B.5.—TAIL NUMBER 6 STATISTICAL PARAMETERS 

(a) Number 6—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 39 39 36.10 5.51 

PR DA1 After 40 759 719 13.53 4.84 

GR DA1 Before 1 39 39 34.60 5.59 

GR DA1 After 40 754 714 14.49 4.45 

PL DA1 Before 1 39 39 17.15 4.60 

PL DA1 After 40 752 712 22.54 21.51 

GL DA1 Before 1 39 39 17.08 4.65 

GL DA1 After 40 760 720 23.95 21.18 

PR FM4 Before 1 39 39 2.98 0.25 

PR FM4 After 40 751 711 2.80 0.31 

GR FM4 Before 1 39 39 2.51 0.21 

GR FM4 After 40 749 709 3.03 0.27 

PL FM4 Before 1 39 39 2.73 0.22 

PL FM4 After 40 745 705 2.90 0.33 

GL FM4 Before 1 39 39 2.95 0.35 

GL FM4 After 40 745 705 2.92 0.33 

PR SI1st Before 1 39 39 6.65 1.37 

PR SI1st After 40 759 719 1.75 0.78 

GR SI1st Before 1 39 39 3.04 0.33 

GR SI1st After 40 754 714 2.06 0.92 

PL SI1st Before 1 39 39 0.61 0.19 

PL SI1st After 40 752 712 2.96 3.12 

GL SI1st Before 1 39 39 1.76 0.67 

GL SI1st After 40 760 720 5.26 3.05 

PR SI3rd Before 1 39 39 4.09 0.52 

PR SI3rd After 40 759 719 0.98 0.32 

GR SI3rd Before 1 39 39 2.83 0.30 

GR SI3rd After 40 754 714 1.93 0.49 

PL SI3rd Before 1 39 39 0.63 0.16 

PL SI3rd After 40 752 712 1.95 1.58 

GL SI3rd Before 1 39 39 1.15 0.41 

GL SI3rd After 40 760 720 3.22 1.67 

PR DiffDA1 Before 1 39 39 14.96 1.17 

PR DiffDA1 After 40 759 719 3.43 0.65 

GR DiffDA1 Before 1 39 39 11.72 1.43 

GR DiffDA1 After 40 754 714 5.95 0.76 

PL DiffDA1 Before 1 39 39 5.08 0.59 

PL DiffDA1 After 40 752 712 5.96 2.86 

GL DiffDA1 Before 1 39 39 4.29 0.52 

GL DiffDA1 After 40 760 720 7.26 2.52 

PR DP2P Before 1 39 39 82.52 9.51 

PR DP2P After 40 759 719 18.33 3.53 

GR DP2P Before 1 39 39 63.46 5.11 

GR DP2P After 40 754 714 36.25 4.87 

PL DP2P Before 1 39 39 26.77 3.41 

PL DP2P After 40 752 712 32.54 16.24 

GL DP2P Before 1 39 39 25.91 4.86 

GL DP2P After 40 760 720 42.94 15.89 

NASA/TM—2014-218406 152 
TABLE B.5.—CONCLUDED 

(a) Number 6—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 33 33 32.39 5.76 

PR DA1 After 34 266 232 33.53 8.91 

GR DA1 Before 1 33 33 34.02 5.84 

GR DA1 After 34 266 232 34.81 8.64 

PL DA1 Before 1 33 33 6.63 0.58 

PL DA1 After 34 266 232 24.63 17.96 

GL DA1 Before 1 33 33 6.54 0.61 

GL DA1 After 34 266 232 25.68 17.58 

PR FM4 Before 1 33 33 3.07 0.32 

PR FM4 After 34 266 232 2.76 0.29 

GR FM4 Before 1 33 33 2.06 0.08 

GR FM4 After 34 266 232 2.83 0.27 

PL FM4 Before 1 33 33 2.17 0.12 

PL FM4 After 34 266 232 2.78 0.45 

GL FM4 Before 1 33 33 3.38 0.19 

GL FM4 After 34 266 232 2.88 0.33 

PR SI1st Before 1 33 33 10.17 1.10 

PR SI1st After 34 266 232 2.63 1.19 

GR SI1st Before 1 33 33 2.23 0.61 

GR SI1st After 34 266 232 4.09 1.19 

PL SI1st Before 1 33 33 0.40 0.13 

PL SI1st After 34 266 232 2.34 2.21 

GL SI1st Before 1 33 33 1.58 0.21 

GL SI1st After 34 266 232 4.01 2.29 

PR SI3rd Before 1 33 33 4.84 0.53 

PR SI3rd After 34 266 232 1.57 0.43 

GR SI3rd Before 1 33 33 2.30 0.39 

GR SI3rd After 34 266 232 3.54 0.80 

PL SI3rd Before 1 33 33 0.40 0.06 

PL SI3rd After 34 266 232 1.53 1.11 

GL SI3rd Before 1 33 33 0.93 0.10 

GL SI3rd After 34 266 232 2.93 1.16 

PR DiffDA1 Before 1 33 33 10.22 0.78 

PR DiffDA1 After 34 266 232 6.77 1.05 

GR DiffDA1 Before 1 33 33 17.90 1.00 

GR DiffDA1 After 34 266 232 10.20 1.93 

PL DiffDA1 Before 1 33 33 5.74 0.37 

PL DiffDA1 After 34 266 232 6.17 2.46 

GL DiffDA1 Before 1 33 33 5.38 0.26 

GL DiffDA1 After 34 266 232 7.96 1.97 

PR DP2P Before 1 33 33 57.08 6.49 

PR DP2P After 34 266 232 36.70 6.80 

GR DP2P Before 1 33 33 83.98 6.89 

GR DP2P After 34 266 232 62.17 9.61 

PL DP2P Before 1 33 33 27.53 1.87 

PL DP2P After 34 266 232 33.26 14.25 

GL DP2P Before 1 33 33 37.15 2.72 

GL DP2P After 34 266 232 48.67 11.70 

NASA/TM—2014-218406 153 
TABLE B.6.—TAIL NUMBER 7 STATISTICAL PARAMETERS—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 13 13 40.72 4.62 

PR DA1 After 14 1063 1049 27.56 7.99 

GR DA1 Before 1 13 13 35.20 4.54 

GR DA1 After 14 1061 1047 14.18 5.96 

PL DA1 Before 1 13 13 11.37 4.65 

PL DA1 After 14 1061 1047 7.51 3.13 

GL DA1 Before 1 13 13 11.45 4.42 

GL DA1 After 14 1063 1049 9.96 2.92 

PR FM4 Before 1 13 13 2.47 0.19 

PR FM4 After 14 1061 1047 2.78 0.39 

GR FM4 Before 1 13 13 4.55 0.54 

GR FM4 After 14 1060 1046 3.00 0.31 

PL FM4 Before 1 13 13 2.59 0.17 

PL FM4 After 14 1051 1037 2.92 0.36 

GL FM4 Before 1 13 13 2.93 0.14 

GL FM4 After 14 1051 1037 2.62 0.18 

PR SI1st Before 1 13 13 3.27 1.00 

PR SI1st After 14 1063 1049 1.88 0.86 

GR SI1st Before 1 13 13 4.51 0.94 

GR SI1st After 14 1061 1047 1.66 0.83 

PL SI1st Before 1 13 13 1.17 0.34 

PL SI1st After 14 1061 1047 0.66 0.26 

GL SI1st Before 1 13 13 1.50 0.67 

GL SI1st After 14 1063 1049 1.19 0.43 

PR SI3rd Before 1 13 13 2.49 0.39 

PR SI3rd After 14 1063 1049 1.41 0.50 

GR SI3rd Before 1 13 13 2.89 0.52 

GR SI3rd After 14 1061 1047 1.01 0.40 

PL SI3rd Before 1 13 13 0.88 0.15 

PL SI3rd After 14 1061 1047 0.53 0.16 

GL SI3rd Before 1 13 13 1.28 0.19 

GL SI3rd After 14 1063 1049 1.11 0.32 

PR DiffDA1 Before 1 13 13 27.65 4.21 

PR DiffDA1 After 14 1063 1049 23.46 6.86 

GR DiffDA1 Before 1 13 13 18.58 1.01 

GR DiffDA1 After 14 1061 1047 3.55 0.89 

PL DiffDA1 Before 1 13 13 3.78 0.52 

PL DiffDA1 After 14 1061 1047 2.79 0.61 

GL DiffDA1 Before 1 13 13 3.92 0.26 

GL DiffDA1 After 14 1063 1049 6.77 1.03 

PR DP2P Before 1 13 13 130.34 17.82 

PR DP2P After 14 1063 1049 119.99 33.86 

GR DP2P Before 1 13 13 135.61 15.63 

GR DP2P After 14 1061 1047 21.50 5.70 

PL DP2P Before 1 13 13 19.09 3.05 

PL DP2P After 14 1061 1047 15.50 3.70 

GL DP2P Before 1 13 13 23.05 1.61 

GL DP2P After 14 1063 1049 37.42 7.17 

NASA/TM—2014-218406 154 
TABLE B.7.—TAIL NUMBER 8 STATISTICAL PARAMETERS 

(a) Number 8—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 61 61 13.35 7.88 

PR DA1 After 62 392 330 29.75 4.82 

GR DA1 Before 1 61 61 13.26 7.48 

GR DA1 After 62 391 329 31.60 4.82 

PL DA1 Before 1 109 109 11.98 3.96 

PL DA1 After 110 439 329 10.01 6.55 

GL DA1 Before 1 109 109 12.44 3.80 

GL DA1 After 110 440 330 8.77 2.96 

PR FM4 Before 1 61 61 2.80 0.28 

PR FM4 After 62 391 329 2.91 0.36 

GR FM4 Before 1 61 61 2.89 0.21 

GR FM4 After 62 390 328 2.47 0.27 

PL FM4 Before 1 106 106 2.71 0.31 

PL FM4 After 107 434 327 2.74 0.36 

GL FM4 Before 1 106 106 2.81 0.35 

GL FM4 After 107 434 327 2.91 0.28 

PR SI1st Before 1 61 61 2.98 2.28 

PR SI1st After 62 392 330 1.18 0.42 

GR SI1st Before 1 61 61 1.76 0.72 

GR SI1st After 62 391 329 2.51 1.13 

PL SI1st Before 1 109 109 1.55 0.54 

PL SI1st After 110 439 329 1.72 0.65 

GL SI1st Before 1 109 109 2.38 1.03 

GL SI1st After 110 440 330 0.94 0.43 

PR SI3rd Before 1 61 61 1.48 1.07 

PR SI3rd After 62 392 330 0.84 0.20 

GR SI3rd Before 1 61 61 1.64 0.71 

GR SI3rd After 62 391 329 1.86 0.68 

PL SI3rd Before 1 109 109 0.84 0.26 

PL SI3rd After 110 439 329 0.94 0.30 

GL SI3rd Before 1 109 109 1.89 0.66 

GL SI3rd After 110 440 330 1.28 0.40 

PR DiffDA1 Before 1 61 61 3.06 1.31 

PR DiffDA1 After 62 392 330 4.39 0.58 

GR DiffDA1 Before 1 61 61 4.07 1.24 

GR DiffDA1 After 62 391 329 10.10 1.46 

PL DiffDA1 Before 1 109 109 3.93 1.10 

PL DiffDA1 After 110 439 329 5.80 7.09 

GL DiffDA1 Before 1 109 109 4.73 1.03 

GL DiffDA1 After 110 440 330 5.29 0.69 

PR DP2P Before 1 61 61 16.64 7.46 

PR DP2P After 62 392 330 24.05 3.86 

GR DP2P Before 1 61 61 24.06 7.07 

GR DP2P After 62 391 329 53.19 7.79 

PL DP2P Before 1 109 109 20.44 5.46 

PL DP2P After 110 439 329 27.22 27.80 

GL DP2P Before 1 109 109 26.84 4.78 

GL DP2P After 110 440 330 31.41 4.72 

NASA/TM—2014-218406 155 
TABLE B.7.—CONCLUDED 

(b) Number 8—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 60 60 24.47 4.50 

PR DA1 After 61 138 77 47.66 10.30 

GR DA1 Before 1 60 60 24.23 4.11 

GR DA1 After 61 138 77 49.14 9.83 

PL DA1 Before 1 71 71 23.38 5.31 

PL DA1 After 72 149 77 33.93 7.55 

GL DA1 Before 1 71 71 23.49 5.39 

GL DA1 After 72 149 77 33.52 8.87 

PR FM4 Before 1 60 60 3.06 0.45 

PR FM4 After 61 138 77 3.20 0.49 

GR FM4 Before 1 60 60 3.15 0.35 

GR FM4 After 61 138 77 3.13 0.19 

PL FM4 Before 1 71 71 2.74 0.25 

PL FM4 After 72 149 77 2.97 0.40 

GL FM4 Before 1 71 71 2.88 0.23 

GL FM4 After 72 149 77 2.93 0.19 

PR SI1st Before 1 60 60 4.16 1.41 

PR SI1st After 61 138 77 1.98 0.69 

GR SI1st Before 1 60 60 2.96 0.61 

GR SI1st After 61 138 77 3.77 1.26 

PL SI1st Before 1 71 71 1.22 0.38 

PL SI1st After 72 149 77 3.55 1.26 

GL SI1st Before 1 71 71 2.12 1.00 

GL SI1st After 72 149 77 1.61 0.53 

PR SI3rd Before 1 60 60 2.10 0.90 

PR SI3rd After 61 138 77 1.43 0.36 

GR SI3rd Before 1 60 60 2.06 0.34 

GR SI3rd After 61 138 77 3.18 0.59 

PL SI3rd Before 1 71 71 0.77 0.19 

PL SI3rd After 72 149 77 2.23 0.65 

GL SI3rd Before 1 71 71 1.90 0.66 

GL SI3rd After 72 149 77 1.88 0.44 

PR DiffDA1 Before 1 60 60 4.74 2.46 

PR DiffDA1 After 61 138 77 6.46 1.19 

GR DiffDA1 Before 1 60 60 5.27 0.61 

GR DiffDA1 After 61 138 77 11.01 1.03 

PL DiffDA1 Before 1 71 71 5.59 1.21 

PL DiffDA1 After 72 149 77 7.34 4.48 

GL DiffDA1 Before 1 71 71 5.98 0.95 

GL DiffDA1 After 72 149 77 8.01 0.93 

PR DP2P Before 1 60 60 25.95 10.17 

PR DP2P After 61 138 77 37.83 8.22 

GR DP2P Before 1 60 60 34.91 5.36 

GR DP2P After 61 138 77 72.45 8.28 

PL DP2P Before 1 71 71 29.56 5.82 

PL DP2P After 72 149 77 39.27 17.63 

GL DP2P Before 1 71 71 37.37 5.73 

GL DP2P After 72 149 77 51.50 8.68 

NASA/TM—2014-218406 156 
TABLE B.8.—TAIL NUMBER 10 STATISTICAL PARAMETERS 

(a) Number 10—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 108 108 12.75 4.38 

PR DA1 After 109 169 60 9.20 3.16 

GR DA1 Before 1 108 108 11.44 3.17 

GR DA1 After 109 169 60 10.44 2.85 

PL DA1 Before 1 108 108 18.67 3.15 

PL DA1 After 109 169 60 12.20 2.74 

GL DA1 Before 1 108 108 18.88 3.18 

GL DA1 After 109 169 60 12.21 2.80 

PR FM4 Before 1 108 108 2.79 0.39 

PR FM4 After 109 169 60 2.93 0.25 

GR FM4 Before 1 108 108 2.88 0.23 

GR FM4 After 109 169 60 2.98 0.20 

PL FM4 Before 1 107 107 2.69 0.33 

PL FM4 After 108 168 60 2.62 0.26 

GL FM4 Before 1 107 107 3.02 0.23 

GL FM4 After 108 168 60 2.93 0.23 

PR SI1st Before 1 108 108 1.12 0.69 

PR SI1st After 109 169 60 1.02 0.62 

GR SI1st Before 1 108 108 1.68 0.88 

GR SI1st After 109 169 60 1.13 0.39 

PL SI1st Before 1 108 108 0.77 0.30 

PL SI1st After 109 169 60 1.30 0.45 

GL SI1st Before 1 108 108 1.69 0.44 

GL SI1st After 109 169 60 1.49 0.57 

PR SI3rd Before 1 108 108 1.02 0.50 

PR SI3rd After 109 169 60 0.57 0.20 

GR SI3rd Before 1 108 108 1.24 0.43 

GR SI3rd After 109 169 60 1.14 0.36 

PL SI3rd Before 1 108 108 0.88 0.19 

PL SI3rd After 109 169 60 1.18 0.30 

GL SI3rd Before 1 108 108 1.28 0.25 

GL SI3rd After 109 169 60 1.25 0.24 

PR DiffDA1 Before 1 108 108 7.73 3.41 

PR DiffDA1 After 109 169 60 5.57 0.99 

GR DiffDA1 Before 1 108 108 5.09 1.23 

GR DiffDA1 After 109 169 60 7.35 0.93 

PL DiffDA1 Before 1 108 108 4.92 0.48 

PL DiffDA1 After 109 169 60 4.74 0.54 

GL DiffDA1 Before 1 108 108 4.82 0.51 

GL DiffDA1 After 109 169 60 4.56 0.38 

PR DP2P Before 1 108 108 40.67 16.44 

PR DP2P After 109 169 60 30.50 5.81 

GR DP2P Before 1 108 108 29.75 7.68 

GR DP2P After 109 169 60 43.79 6.31 

PL DP2P Before 1 108 108 25.58 3.53 

PL DP2P After 109 169 60 24.54 3.79 

GL DP2P Before 1 108 108 29.31 3.85 

GL DP2P After 109 169 60 26.36 2.49 

NASA/TM—2014-218406 157 
TABLE B.8.—CONCLUDED 

(b) Number 10—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 57 57 21.35 2.49 

PR DA1 After 58 86 28 26.16 4.06 

GR DA1 Before 1 57 57 15.91 2.04 

GR DA1 After 58 86 28 25.88 4.33 

PL DA1 Before 1 57 57 16.56 3.56 

PL DA1 After 58 86 28 19.33 6.26 

GL DA1 Before 1 57 57 16.94 3.35 

GL DA1 After 58 86 28 19.90 5.64 

PR FM4 Before 1 57 57 2.48 0.16 

PR FM4 After 58 86 28 2.40 0.16 

GR FM4 Before 1 57 57 2.98 0.33 

GR FM4 After 58 86 28 3.03 0.16 

PL FM4 Before 1 57 57 3.19 0.37 

PL FM4 After 58 86 28 2.92 0.25 

GL FM4 Before 1 57 57 2.84 0.21 

GL FM4 After 58 86 28 2.64 0.25 

PR SI1st Before 1 57 57 3.43 0.87 

PR SI1st After 58 86 28 1.62 0.55 

GR SI1st Before 1 57 57 4.23 1.58 

GR SI1st After 58 86 28 1.86 0.48 

PL SI1st Before 1 57 57 1.73 0.49 

PL SI1st After 58 86 28 1.96 0.60 

GL SI1st Before 1 57 57 1.96 0.56 

GL SI1st After 58 86 28 2.91 0.50 

PR SI3rd Before 1 57 57 3.10 1.15 

PR SI3rd After 58 86 28 1.04 0.25 

GR SI3rd Before 1 57 57 2.54 0.76 

GR SI3rd After 58 86 28 1.74 0.30 

PL SI3rd Before 1 57 57 1.25 0.21 

PL SI3rd After 58 86 28 1.20 0.22 

GL SI3rd Before 1 57 57 1.28 0.26 

GL SI3rd After 58 86 28 1.63 0.19 

PR DiffDA1 Before 1 57 57 16.16 3.52 

PR DiffDA1 After 58 86 28 9.79 0.79 

GR DiffDA1 Before 1 57 57 7.72 0.74 

GR DiffDA1 After 58 86 28 9.09 0.76 

PL DiffDA1 Before 1 57 57 4.67 0.58 

PL DiffDA1 After 58 86 28 5.39 0.78 

GL DiffDA1 Before 1 57 57 5.72 0.46 

GL DiffDA1 After 58 86 28 6.48 0.45 

PR DP2P Before 1 57 57 80.25 20.78 

PR DP2P After 58 86 28 46.67 4.08 

GR DP2P Before 1 57 57 47.74 8.65 

GR DP2P After 58 86 28 59.67 5.11 

PL DP2P Before 1 57 57 28.44 3.78 

PL DP2P After 58 86 28 30.48 4.54 

GL DP2P Before 1 57 57 35.32 3.22 

GL DP2P After 58 86 28 37.44 4.46 

NASA/TM—2014-218406 158 
TABLE B.9.——TAIL NUMBER 13 STATISTICAL PARAMETERS 

(a) Number 13—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 88 88 75.48 53.14 

PR DA1 After 89 92 3 21.24 10.92 

GR DA1 Before 1 88 88 27.51 10.81 

GR DA1 After 89 92 3 21.17 12.91 

PL DA1 Before 1 88 88 14.26 5.47 

PL DA1 After 89 92 3 28.18 3.42 

GL DA1 Before 1 88 88 16.17 4.90 

GL DA1 After 89 92 3 28.52 2.23 

PR FM4 Before 1 88 88 2.64 0.35 

PR FM4 After 89 92 3 2.10 0.29 

GR FM4 Before 1 88 88 3.00 0.62 

GR FM4 After 89 92 3 3.16 0.26 

PL FM4 Before 1 87 87 2.83 0.32 

PL FM4 After 88 91 3 2.77 0.26 

GL FM4 Before 1 87 87 3.13 0.24 

GL FM4 After 88 91 3 3.07 0.17 

PR SI1st Before 1 88 88 9.91 8.41 

PR SI1st After 89 92 3 2.46 0.46 

GR SI1st Before 1 88 88 1.56 0.90 

GR SI1st After 89 92 3 3.14 2.10 

PL SI1st Before 1 88 88 2.56 1.00 

PL SI1st After 89 92 3 2.62 0.84 

GL SI1st Before 1 88 88 3.99 1.23 

GL SI1st After 89 92 3 4.42 1.04 

PR SI3rd Before 1 88 88 6.48 4.09 

PR SI3rd After 89 92 3 1.26 0.19 

GR SI3rd Before 1 88 88 1.98 0.94 

GR SI3rd After 89 92 3 2.73 1.03 

PL SI3rd Before 1 88 88 1.45 0.44 

PL SI3rd After 89 92 3 1.96 0.63 

GL SI3rd Before 1 88 88 3.11 0.48 

GL SI3rd After 89 92 3 3.33 0.49 

PR DiffDA1 Before 1 88 88 70.69 52.54 

PR DiffDA1 After 89 92 3 7.59 0.64 

GR DiffDA1 Before 1 88 88 18.44 5.42 

GR DiffDA1 After 89 92 3 6.97 1.22 

PL DiffDA1 Before 1 88 88 4.12 0.52 

PL DiffDA1 After 89 92 3 6.44 1.11 

GL DiffDA1 Before 1 88 88 7.37 0.51 

GL DiffDA1 After 89 92 3 8.22 0.55 

PR DP2P Before 1 88 88 352.10 264.85 

PR DP2P After 89 92 3 33.24 2.24 

GR DP2P Before 1 88 88 110.01 43.48 

GR DP2P After 89 92 3 41.76 8.64 

PL DP2P Before 1 88 88 22.35 3.54 

PL DP2P After 89 92 3 34.90 5.78 

GL DP2P Before 1 88 88 46.35 4.13 

GL DP2P After 89 92 3 52.81 3.73 

NASA/TM—2014-218406 159 
TABLE B.9.—CONCLUDED 

(b) Number 13—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 31 31 55.77 40.40 

PR DA1 After 32 32 0 8.80 0.00 

GR DA1 Before 1 31 31 40.65 12.03 

GR DA1 After 32 32 0 10.04 0.00 

PL DA1 Before 1 31 31 41.07 5.69 

PL DA1 After 32 32 0 52.73 0.00 

GL DA1 Before 1 31 31 41.69 5.67 

GL DA1 After 32 32 0 52.62 0.00 

PR FM4 Before 1 31 31 3.03 0.48 

PR FM4 After 32 32 0 2.56 0.00 

GR FM4 Before 1 31 31 3.06 1.52 

GR FM4 After 32 32 0 2.81 0.00 

PL FM4 Before 1 31 31 2.99 0.51 

PL FM4 After 32 32 0 2.45 0.00 

GL FM4 Before 1 31 31 3.08 0.17 

GL FM4 After 32 32 0 2.76 0.00 

PR SI1st Before 1 31 31 9.01 7.18 

PR SI1st After 32 32 0 2.81 0.00 

GR SI1st Before 1 31 31 3.31 2.15 

GR SI1st After 32 32 0 2.78 0.00 

PL SI1st Before 1 31 31 2.17 0.54 

PL SI1st After 32 32 0 2.33 0.00 

GL SI1st Before 1 31 31 4.15 0.68 

GL SI1st After 32 32 0 5.21 0.00 

PR SI3rd Before 1 31 31 5.60 3.55 

PR SI3rd After 32 32 0 2.06 0.00 

GR SI3rd Before 1 31 31 2.96 1.46 

GR SI3rd After 32 32 0 3.06 0.00 

PL SI3rd Before 1 31 31 1.26 0.30 

PL SI3rd After 32 32 0 1.51 0.00 

GL SI3rd Before 1 31 31 2.45 0.42 

GL SI3rd After 32 32 0 3.13 0.00 

PR DiffDA1 Before 1 31 31 45.89 40.88 

PR DiffDA1 After 32 32 0 5.94 0.00 

GR DiffDA1 Before 1 31 31 30.07 5.01 

GR DiffDA1 After 32 32 0 7.41 0.00 

PL DiffDA1 Before 1 31 31 7.26 0.87 

PL DiffDA1 After 32 32 0 9.20 0.00 

GL DiffDA1 Before 1 31 31 8.70 0.68 

GL DiffDA1 After 32 32 0 10.09 0.00 

PR DP2P Before 1 31 31 265.33 244.90 

PR DP2P After 32 32 0 30.06 0.00 

GR DP2P Before 1 31 31 180.08 76.12 

GR DP2P After 32 32 0 43.95 0.00 

PL DP2P Before 1 31 31 40.20 6.02 

PL DP2P After 32 32 0 41.43 0.00 

GL DP2P Before 1 31 31 55.97 5.72 

GL DP2P After 32 32 0 63.20 0.00 

NASA/TM—2014-218406 160 
TABLE B.10.—FIGURE B.14.1.—TAIL NUMBER 14 STATISTICAL PARAMETERS 

(a) Number 14—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 75 75 17.34 6.17 

PR DA1 After 76 370 294 22.19 6.23 

GR DA1 Before 1 75 75 17.18 4.38 

GR DA1 After 76 370 294 22.79 5.62 

PL DA1 Before 1 75 75 134.36 31.10 

PL DA1 After 76 569 493 7.71 2.57 

GL DA1 Before 1 75 75 133.65 32.22 

GL DA1 After 76 569 493 8.93 2.13 

PR FM4 Before 1 75 75 2.70 0.42 

PR FM4 After 76 370 294 2.87 0.39 

GR FM4 Before 1 75 75 2.52 0.32 

GR FM4 After 76 370 294 2.75 0.28 

PL FM4 Before 1 75 75 2.69 0.28 

PL FM4 After 76 564 488 2.65 0.33 

GL FM4 Before 1 75 75 3.53 0.40 

GL FM4 After 76 564 488 2.99 0.24 

PR SI1st Before 1 75 75 3.06 0.96 

PR SI1st After 76 370 294 3.21 1.41 

GR SI1st Before 1 75 75 2.30 0.64 

GR SI1st After 76 370 294 2.80 1.21 

PL SI1st Before 1 75 75 6.93 3.63 

PL SI1st After 76 569 493 1.12 0.43 

GL SI1st Before 1 75 75 8.00 3.01 

GL SI1st After 76 569 493 3.31 1.32 

PR SI3rd Before 1 75 75 1.72 0.43 

PR SI3rd After 76 370 294 1.83 0.63 

GR SI3rd Before 1 75 75 1.72 0.43 

GR SI3rd After 76 370 294 2.11 0.60 

PL SI3rd Before 1 75 75 5.98 1.37 

PL SI3rd After 76 569 493 0.68 0.16 

GL SI3rd Before 1 75 75 5.73 1.37 

GL SI3rd After 76 569 493 1.80 0.57 

PR DiffDA1 Before 1 75 75 6.25 2.67 

PR DiffDA1 After 76 370 294 5.55 1.50 

GR DiffDA1 Before 1 75 75 9.45 2.44 

GR DiffDA1 After 76 370 294 7.88 2.17 

PL DiffDA1 Before 1 75 75 27.40 3.32 

PL DiffDA1 After 76 569 493 3.00 0.46 

GL DiffDA1 Before 1 75 75 19.44 2.93 

GL DiffDA1 After 76 569 493 3.77 0.55 

PR DP2P Before 1 75 75 31.49 10.53 

PR DP2P After 76 370 294 30.15 7.50 

GR DP2P Before 1 75 75 48.28 9.48 

GR DP2P After 76 370 294 43.65 11.18 

PL DP2P Before 1 75 75 144.01 20.84 

PL DP2P After 76 569 493 15.35 2.67 

GL DP2P Before 1 75 75 127.28 23.93 

GL DP2P After 76 569 493 22.70 3.82 

NASA/TM—2014-218406 161 
TABLE B.10.—CONCLUDED

(b) Number 14—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 24 24 25.07 6.97 

PR DA1 After 25 87 62 25.24 8.53 

GR DA1 Before 1 24 24 25.99 6.94 

GR DA1 After 25 87 62 25.71 8.31 

PL DA1 Before 1 24 24 98.94 33.41 

PL DA1 After 25 134 109 18.07 4.20 

GL DA1 Before 1 24 24 96.54 35.52 

GL DA1 After 25 134 109 19.16 4.04 

PR FM4 Before 1 24 24 2.79 0.22 

PR FM4 After 25 87 62 2.98 0.39 

GR FM4 Before 1 24 24 2.87 0.16 

GR FM4 After 25 87 62 2.91 0.26 

PL FM4 Before 1 24 24 2.71 0.29 

PL FM4 After 25 134 109 2.92 0.33 

GL FM4 Before 1 24 24 4.07 0.38 

GL FM4 After 25 134 109 2.90 0.18 

PR SI1st Before 1 24 24 3.39 1.00 

PR SI1st After 25 87 62 3.39 1.48 

GR SI1st Before 1 24 24 3.71 0.97 

GR SI1st After 25 87 62 2.98 1.55 

PL SI1st Before 1 24 24 11.06 3.57 

PL SI1st After 25 134 109 2.06 1.10 

GL SI1st Before 1 24 24 10.19 0.95 

GL SI1st After 25 134 109 4.88 1.14 

PR SI3rd Before 1 24 24 1.74 0.45 

PR SI3rd After 25 87 62 1.82 0.54 

GR SI3rd Before 1 24 24 2.35 0.47 

GR SI3rd After 25 87 62 2.17 0.78 

PL SI3rd Before 1 24 24 8.32 1.18 

PL SI3rd After 25 134 109 1.23 0.44 

GL SI3rd Before 1 24 24 6.42 1.40 

GL SI3rd After 25 134 109 2.87 0.44 

PR DiffDA1 Before 1 24 24 5.59 1.12 

PR DiffDA1 After 25 87 62 6.21 1.11 

GR DiffDA1 Before 1 24 24 7.65 1.65 

GR DiffDA1 After 25 87 62 7.88 1.65 

PL DiffDA1 Before 1 24 24 32.87 5.50 

PL DiffDA1 After 25 134 109 3.62 0.45 

GL DiffDA1 Before 1 24 24 25.08 3.01 

GL DiffDA1 After 25 134 109 5.25 0.40 

PR DP2P Before 1 24 24 29.74 6.49 

PR DP2P After 25 87 62 34.44 6.92 

GR DP2P Before 1 24 24 47.81 11.45 

GR DP2P After 25 87 62 49.76 9.96 

PL DP2P Before 1 24 24 171.79 25.07 

PL DP2P After 25 134 109 20.24 3.18 

GL DP2P Before 1 24 24 185.36 27.92 

GL DP2P After 25 134 109 32.81 3.50 

NASA/TM—2014-218406 162 
TABLE B.11.—TAIL NUMBER 15 STATISTICAL PARAMETERS—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 54 54 6.52 2.27 

PR DA1 After 55 151 96 5.73 2.52 

GR DA1 Before 1 54 54 6.17 2.25 

GR DA1 After 55 151 96 5.42 2.09 

PL DA1 Before 1 60 60 36.52 19.57 

PL DA1 After 61 157 96 3.51 2.40 

GL DA1 Before 1 60 60 21.94 13.98 

GL DA1 After 61 157 96 4.21 1.55 

PR FM4 Before 1 93 93 2.64 0.34 

PR FM4 After 94 190 96 2.82 0.32 

GR FM4 Before 1 93 93 2.40 0.34 

GR FM4 After 94 190 96 2.44 0.26 

PL FM4 Before 1 99 99 2.73 0.39 

PL FM4 After 100 196 96 2.88 0.41 

GL FM4 Before 1 98 98 3.17 0.44 

GL FM4 After 99 195 96 2.67 0.29 

PR SI1st Before 1 54 54 0.97 0.40 

PR SI1st After 55 151 96 1.06 0.57 

GR SI1st Before 1 54 54 0.20 0.12 

GR SI1st After 55 151 96 0.30 0.18 

PL SI1st Before 1 60 60 2.02 1.56 

PL SI1st After 61 157 96 0.49 0.25 

GL SI1st Before 1 60 60 1.77 1.31 

GL SI1st After 61 157 96 0.72 0.41 

PR SI3rd Before 1 54 54 0.46 0.17 

PR SI3rd After 55 151 96 0.53 0.26 

GR SI3rd Before 1 54 54 0.26 0.15 

GR SI3rd After 55 151 96 0.30 0.16 

PL SI3rd Before 1 60 60 2.91 1.51 

PL SI3rd After 61 157 96 0.27 0.12 

GL SI3rd Before 1 60 60 1.27 0.77 

GL SI3rd After 61 157 96 0.44 0.23 

PR DiffDA1 Before 1 54 54 2.50 0.55 

PR DiffDA1 After 55 151 96 2.16 0.58 

GR DiffDA1 Before 1 54 54 4.56 1.56 

GR DiffDA1 After 55 151 96 3.94 1.26 

PL DiffDA1 Before 1 60 60 17.29 3.65 

PL DiffDA1 After 61 157 96 1.99 0.42 

GL DiffDA1 Before 1 60 60 6.97 1.92 

GL DiffDA1 After 61 157 96 3.57 0.93 

PR DP2P Before 1 54 54 12.63 2.74 

PR DP2P After 55 151 96 11.51 3.28 

GR DP2P Before 1 54 54 23.22 7.29 

GR DP2P After 55 151 96 19.39 5.96 

PL DP2P Before 1 60 60 82.22 19.63 

PL DP2P After 61 157 96 10.48 2.62 

GL DP2P Before 1 60 60 42.50 14.95 

GL DP2P After 61 157 96 19.02 5.12 

NASA/TM—2014-218406 163 
TABLE B.12.—TAIL NUMBER 16 STATISTICAL PARAMETERS 

(a) Number 16—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 463 463 5.82 2.33 

PR DA1 After 464 606 142 22.95 8.65 

GR DA1 Before 1 463 463 6.92 2.42 

GR DA1 After 464 605 141 23.56 8.60 

PL DA1 Before 1 488 488 49.82 15.68 

PL DA1 After 489 630 141 11.78 2.41 

GL DA1 Before 1 490 490 51.07 15.10 

GL DA1 After 491 634 143 12.72 2.24 

PR FM4 Before 1 462 462 2.40 0.31 

PR FM4 After 463 604 141 3.00 0.40 

GR FM4 Before 1 462 462 2.88 0.24 

GR FM4 After 463 604 141 2.78 0.24 

PL FM4 Before 1 487 487 2.84 0.37 

PL FM4 After 488 628 140 2.91 0.24 

GL FM4 Before 1 487 487 3.27 0.36 

GL FM4 After 488 628 140 2.99 0.25 

PR SI1st Before 1 463 463 0.79 0.32 

PR SI1st After 464 606 142 2.46 0.90 

GR SI1st Before 1 463 463 3.23 1.09 

GR SI1st After 464 605 141 2.55 0.87 

PL SI1st Before 1 488 488 2.61 1.43 

PL SI1st After 489 630 141 1.66 0.46 

GL SI1st Before 1 490 490 6.78 1.34 

GL SI1st After 491 634 143 2.70 0.58 

PR SI3rd Before 1 463 463 0.49 0.13 

PR SI3rd After 464 606 142 1.34 0.36 

GR SI3rd Before 1 463 463 2.25 0.54 

GR SI3rd After 464 605 141 1.56 0.50 

PL SI3rd Before 1 488 488 2.10 0.77 

PL SI3rd After 489 630 141 1.07 0.19 

GL SI3rd Before 1 490 490 4.12 0.69 

GL SI3rd After 491 634 143 2.20 0.37 

PR DiffDA1 Before 1 463 463 3.77 0.85 

PR DiffDA1 After 464 606 142 3.92 0.73 

GR DiffDA1 Before 1 463 463 4.27 0.78 

GR DiffDA1 After 464 605 141 6.47 1.19 

PL DiffDA1 Before 1 488 488 8.97 4.12 

PL DiffDA1 After 489 630 141 4.78 0.42 

GL DiffDA1 Before 1 490 490 11.33 1.76 

GL DiffDA1 After 491 634 143 5.93 0.64 

PR DP2P Before 1 463 463 17.76 3.27 

PR DP2P After 464 606 142 21.86 4.78 

GR DP2P Before 1 463 463 24.65 4.28 

GR DP2P After 464 605 141 37.35 7.79 

PL DP2P Before 1 488 488 48.80 21.77 

PL DP2P After 489 630 141 26.34 3.01 

GL DP2P Before 1 490 490 72.83 14.17 

GL DP2P After 491 634 143 35.56 4.55 

NASA/TM—2014-218406 164 
TABLE B.12.—CONCLUDED 

(b) Number 16—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 142 142 14.54 3.17 

PR DA1 After 143 188 45 49.11 7.30 

GR DA1 Before 1 142 142 14.38 3.44 

GR DA1 After 143 188 45 51.06 7.38 

PL DA1 Before 1 150 150 71.62 18.30 

PL DA1 After 151 196 45 32.60 7.74 

GL DA1 Before 1 150 150 72.62 18.19 

GL DA1 After 151 196 45 33.56 7.66 

PR FM4 Before 1 142 142 2.09 0.24 

PR FM4 After 143 188 45 2.93 0.32 

GR FM4 Before 1 142 142 2.94 0.31 

GR FM4 After 143 188 45 2.91 0.16 

PL FM4 Before 1 150 150 2.87 0.34 

PL FM4 After 151 196 45 2.98 0.29 

GL FM4 Before 1 150 150 3.19 0.28 

GL FM4 After 151 196 45 3.00 0.24 

PR SI1st Before 1 142 142 0.96 0.31 

PR SI1st After 143 188 45 2.25 0.63 

GR SI1st Before 1 142 142 4.55 1.06 

GR SI1st After 143 188 45 5.35 1.32 

PL SI1st Before 1 150 150 2.81 1.40 

PL SI1st After 151 196 45 2.36 0.62 

GL SI1st Before 1 150 150 5.03 1.50 

GL SI1st After 151 196 45 3.66 0.92 

PR SI3rd Before 1 142 142 0.61 0.12 

PR SI3rd After 143 188 45 1.52 0.36 

GR SI3rd Before 1 142 142 2.63 0.43 

GR SI3rd After 143 188 45 4.08 0.62 

PL SI3rd Before 1 150 150 2.25 0.75 

PL SI3rd After 151 196 45 1.52 0.30 

GL SI3rd Before 1 150 150 3.65 0.79 

GL SI3rd After 151 196 45 3.36 0.44 

PR DiffDA1 Before 1 142 142 8.18 1.34 

PR DiffDA1 After 143 188 45 6.55 0.97 

GR DiffDA1 Before 1 142 142 5.97 1.17 

GR DiffDA1 After 143 188 45 11.75 1.09 

PL DiffDA1 Before 1 150 150 11.85 4.65 

PL DiffDA1 After 151 196 45 6.30 0.62 

GL DiffDA1 Before 1 150 150 15.23 2.77 

GL DiffDA1 After 151 196 45 8.21 0.76 

PR DP2P Before 1 142 142 36.79 6.31 

PR DP2P After 143 188 45 36.32 5.24 

GR DP2P Before 1 142 142 36.39 7.38 

GR DP2P After 143 188 45 74.24 8.64 

PL DP2P Before 1 150 150 65.64 26.24 

PL DP2P After 151 196 45 35.87 4.65 

GL DP2P Before 1 150 150 103.29 24.59 

GL DP2P After 151 196 45 52.71 5.97 

NASA/TM—2014-218406 165 
TABLE B.13.—TAIL NUMBER 18 STATISTICAL PARAMETERS—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 29 29 20.86 11.61 

PR DA1 After 30 488 458 25.09 10.14 

GR DA1 Before 1 29 29 22.81 11.57 

GR DA1 After 30 488 458 27.25 10.01 

PL DA1 Before 1 29 29 24.43 4.17 

PL DA1 After 30 488 458 19.67 7.78 

GL DA1 Before 1 29 29 15.71 5.14 

GL DA1 After 30 490 460 21.20 7.97 

PR FM4 Before 1 29 29 2.84 0.31 

PR FM4 After 30 487 457 2.93 0.32 

GR FM4 Before 1 29 29 2.63 0.23 

GR FM4 After 30 485 455 2.63 0.20 

PL FM4 Before 1 29 29 4.01 0.32 

PL FM4 After 30 485 455 2.77 0.31 

GL FM4 Before 1 29 29 2.94 0.26 

GL FM4 After 30 485 455 2.86 0.24 

PR SI1st Before 1 29 29 1.51 0.44 

PR SI1st After 30 488 458 1.97 0.72 

GR SI1st Before 1 29 29 2.65 0.82 

GR SI1st After 30 488 458 2.67 1.10 

PL SI1st Before 1 29 29 4.54 1.04 

PL SI1st After 30 488 458 2.17 0.69 

GL SI1st Before 1 29 29 1.51 0.62 

GL SI1st After 30 490 460 2.66 1.03 

PR SI3rd Before 1 29 29 0.89 0.18 

PR SI3rd After 30 488 458 1.04 0.28 

GR SI3rd Before 1 29 29 2.99 0.47 

GR SI3rd After 30 488 458 3.74 0.77 

PL SI3rd Before 1 29 29 5.23 0.92 

PL SI3rd After 30 488 458 1.38 0.32 

GL SI3rd Before 1 29 29 1.04 0.39 

GL SI3rd After 30 490 460 2.43 0.82 

PR DiffDA1 Before 1 29 29 3.56 1.11 

PR DiffDA1 After 30 488 458 3.87 1.03 

GR DiffDA1 Before 1 29 29 7.27 0.98 

GR DiffDA1 After 30 488 458 8.93 1.67 

PL DiffDA1 Before 1 29 29 18.68 3.04 

PL DiffDA1 After 30 488 458 5.47 0.63 

GL DiffDA1 Before 1 29 29 4.88 0.30 

GL DiffDA1 After 30 490 460 8.06 1.25 

PR DP2P Before 1 29 29 19.76 6.61 

PR DP2P After 30 488 458 21.55 6.20 

GR DP2P Before 1 29 29 40.34 5.56 

GR DP2P After 30 488 458 49.65 9.62 

PL DP2P Before 1 29 29 117.59 18.23 

PL DP2P After 30 488 458 29.25 4.65 

GL DP2P Before 1 29 29 28.36 2.73 

GL DP2P After 30 490 460 46.08 7.39 

NASA/TM—2014-218406 166 
TABLE B.14.—TAIL NUMBER 20 STATISTICAL PARAMETERS 

(a) Number 20—FPG101 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 492 492 28.13 24.84 

PR DA1 After 493 503 10 39.50 12.43 

GR DA1 Before 1 492 492 24.67 26.13 

GR DA1 After 493 503 10 39.31 12.55 

PL DA1 Before 1 529 529 11.52 12.01 

PL DA1 After 530 540 10 7.49 2.03 

GL DA1 Before 1 531 531 8.35 2.51 

GL DA1 After 532 542 10 9.05 1.99 

PR FM4 Before 1 492 492 2.72 0.35 

PR FM4 After 493 503 10 2.43 0.27 

GR FM4 Before 1 367 367 3.22 2.62 

GR FM4 After 368 378 10 3.18 0.51 

PL FM4 Before 1 523 523 2.62 0.38 

PL FM4 After 524 534 10 3.16 0.46 

GL FM4 Before 1 523 523 2.84 0.20 

GL FM4 After 524 534 10 2.71 0.18 

PR SI1st Before 1 492 492 2.06 1.67 

PR SI1st After 493 503 10 2.38 0.92 

GR SI1st Before 1 492 492 3.21 3.37 

GR SI1st After 493 503 10 3.35 0.53 

PL SI1st Before 1 529 529 1.40 1.12 

PL SI1st After 530 540 10 1.64 0.44 

GL SI1st Before 1 531 531 1.62 1.01 

GL SI1st After 532 542 10 2.39 1.06 

PR SI3rd Before 1 492 492 1.40 1.06 

PR SI3rd After 493 503 10 1.24 0.32 

GR SI3rd Before 1 492 492 1.91 1.77 

GR SI3rd After 493 503 10 2.80 0.44 

PL SI3rd Before 1 529 529 0.83 0.51 

PL SI3rd After 530 540 10 0.89 0.17 

GL SI3rd Before 1 531 531 1.07 0.55 

GL SI3rd After 532 542 10 1.43 0.55 

PR DiffDA1 Before 1 492 492 10.83 7.26 

PR DiffDA1 After 493 503 10 8.37 1.24 

GR DiffDA1 Before 1 492 492 5.79 2.90 

GR DiffDA1 After 493 503 10 7.64 0.92 

PL DiffDA1 Before 1 529 529 8.48 12.56 

PL DiffDA1 After 530 540 10 3.90 0.65 

GL DiffDA1 Before 1 531 531 5.37 1.17 

GL DiffDA1 After 532 542 10 6.04 0.63 

PR DP2P Before 1 492 492 54.06 33.05 

PR DP2P After 493 503 10 41.56 7.21 

GR DP2P Before 1 492 492 34.14 19.06 

GR DP2P After 493 503 10 47.80 7.67 

PL DP2P Before 1 529 529 38.18 48.97 

PL DP2P After 530 540 10 22.06 3.06 

GL DP2P Before 1 531 531 30.34 6.89 

GL DP2P After 532 542 10 32.78 4.00 

NASA/TM—2014-218406 167 
TABLE B.14.—CONCLUDED 

(b) Number 20—120KTA 

Location CI name Status Index start Index end No. points Mean STD 

PR DA1 Before 1 76 76 37.75 13.55 

PR DA1 After N/A N/A N/A N/A N/A 

GR DA1 Before 1 76 76 37.38 13.57 

GR DA1 After N/A N/A N/A N/A N/A 

PL DA1 Before 1 91 91 33.34 10.69 

PL DA1 After N/A N/A N/A N/A N/A 

GL DA1 Before 1 91 91 34.28 11.35 

GL DA1 After N/A N/A N/A N/A N/A 

PR FM4 Before 1 76 76 2.55 0.29 

PR FM4 After N/A N/A N/A N/A N/A 

GR FM4 Before 1 76 76 3.14 0.31 

GR FM4 After N/A N/A N/A N/A N/A 

PL FM4 Before 1 91 91 2.85 0.29 

PL FM4 After N/A N/A N/A N/A N/A 

GL FM4 Before 1 91 91 2.87 0.26 

GL FM4 After N/A N/A N/A N/A N/A 

PR SI1st Before 1 76 76 2.45 1.47 

PR SI1st After N/A N/A N/A N/A N/A 

GR SI1st Before 1 76 76 3.05 0.90 

GR SI1st After N/A N/A N/A N/A N/A 

PL SI1st Before 1 91 91 1.94 0.69 

PL SI1st After N/A N/A N/A N/A N/A 

GL SI1st Before 1 91 91 6.36 2.32 

GL SI1st After N/A N/A N/A N/A N/A 

PR SI3rd Before 1 76 76 1.85 0.98 

PR SI3rd After N/A N/A N/A N/A N/A 

GR SI3rd Before 1 76 76 2.00 0.62 

GR SI3rd After N/A N/A N/A N/A N/A 

PL SI3rd Before 1 91 91 1.35 0.31 

PL SI3rd After N/A N/A N/A N/A N/A 

GL SI3rd Before 1 91 91 3.47 0.96 

GL SI3rd After N/A N/A N/A N/A N/A 

PR DiffDA1 Before 1 76 76 9.83 2.63 

PR DiffDA1 After N/A N/A N/A N/A N/A 

GR DiffDA1 Before 1 76 76 6.63 2.41 

GR DiffDA1 After N/A N/A N/A N/A N/A 

PL DiffDA1 Before 1 91 91 7.26 1.14 

PL DiffDA1 After N/A N/A N/A N/A N/A 

GL DiffDA1 Before 1 91 91 8.42 1.17 

GL DiffDA1 After N/A N/A N/A N/A N/A 

PR DP2P Before 1 76 76 49.91 15.31 

PR DP2P After N/A N/A N/A N/A N/A 

GR DP2P Before 1 76 76 43.39 15.99 

GR DP2P After N/A N/A N/A N/A N/A 

PL DP2P Before 1 91 91 39.89 7.02 

PL DP2P After N/A N/A N/A N/A N/A 

GL DP2P Before 1 91 91 52.79 9.74 

GL DP2P After N/A N/A N/A N/A N/A 

 

NASA/TM—2014-218406 168 
Appendix C.—CI Comparison for Damaged and Undamaged Cases 

C.1 Output Gear Comparisons 

Figure C.1.1.—Output Gear CI Comparison for FPG Regime

NGB FPG Output Gear Undamaged Cases

0 50 100

D P2P

0 10 20

D DA1

0 50 100

DA1

0 5 10

SI3

0 5 10

SI1

0 2 4

0

50

100

FM4

D P2P

0

10

20

D DA1

0

50

100

DA1

0

5

10

SI3

0

5

10

SI1

0

2

4

FM4

NGB FPG Output Gear Damaged Cases

0 200 400

D P2P

0 20 40

D DA1

0 100 200

DA1

0 10 20

SI3

0 20 40

SI1

2 4 6

0

200

400

FM4

D P2P

0

20

40

D DA1

0

100

200

DA1

0

10

20

SI3

0

20

40

SI1

2

4

6

FM4

NASA/TM—2014-218406 169 
Figure C.1.2.—Output Gear CI Comparison for 120KTA Regime

NGB 120KTA Output Gear Undamaged Cases

0 100 200

D P2P

0 10 20

D DA1

0 100 200

DA1

0 5 10

SI3

0 10 20

SI1

2 4 6

0

100

200

FM4

D P2P

0

10

20

D DA1

0

100

200

DA1

0

5

10

SI3

0

10

20

SI1

2

4

6

FM4

NGB 120KTA Output Gear Damaged Cases

0 200 400

D P2P

0 20 40

D DA1

0 100 200

DA1

0 5 10

SI3

0 10 20

SI1

0 5 10

0

200

400

FM4

D P2P

0

20

40

D DA1

0

100

200

DA1

0

5

10

SI3

0

10

20

SI1

0

5

10

FM4

NASA/TM—2014-218406 170 
C.2 Input Pinion Comparisons 

 

Figure C.2.1.—Input Pinion CI Comparison for FPG Regime

 

NGB FPG Input Pinion Undamaged Cases

0 100 200

D P2P

0 20 40

D DA1

0 50 100

DA1

0 2 4

SI3

0 5 10

SI1

0 5 10

0

100

200

FM4

D P2P

0

20

40

D DA1

0

50

100

DA1

0

2

4

SI3

0

5

10

SI1

0

5

10

FM4

NGB FPG Input Pinion Damaged Cases

0 5001000

D P2P

0 100 200

D DA1

0 100 200

DA1

0 10 20

SI3

0 20 40

SI1

2 4 6

0

500

1000

FM4

D P2P

0

100

200

D DA1

0

100

200

DA1

0

10

20

SI3

0

20

40

SI1

2

4

6

FM4

NASA/TM—2014-218406 171 
Figure C.2.2.—Input Pinion CI Comparison for 120KTA Regime

 

NGB 120KTA Input Pinion Undamaged Cases

0 100 200

D P2P

0 10 20

D DA1

0 100 200

DA1

0 5 10

SI3

0 5 10

SI1

0 2 4

0

100

200

FM4

D P2P

0

10

20

D DA1

0

100

200

DA1

0

5

10

SI3

0

5

10

SI1

0

2

4

FM4

NGB 120KTA Input Pinion Damaged Cases

0 5001000

D P2P

0 100 200

D DA1

0 100 200

DA1

0 10 20

SI3

0 20 40

SI1

0 2 4

0

500

1000

FM4

D P2P

0

100

200

D DA1

0

100

200

DA1

0

10

20

SI3

0

20

40

SI1

0

2

4

FM4

NASA/TM—2014-218406 172 
References 

1. Federal Aviation Administration Advisory Circular (AC) 29–2C, Section MG–15, Airworthiness

Approval of RC (HUMS) per Code of Federal Regulations, Title 14-Aeronautics and Space, Chapter

I-Federal Aviation Administration, Department of Transportation, Part 29-Airworthiness Standards:

Transport Category Rotorcraft.

2. Antolick, L., Wade, D.R. and Brower, N.G.: “Application of Advanced Vibration Techniques for

Enhancing Bearing Diagnostics on a HUMS-Equipped Fleet,” Presented at the American Helicopter

Society CBM Specialists Conference, Huntsville, AL, February 11-13 2013.

3. Civil Aviation Authority: CAP 753, “Helicopter Vibration Health Monitoring (VHM) Guidance

Material for Operators Utilizing VHM in Rotor and Rotor Drive Systems of Helicopters,” First

Edition June 2006. First Edition incorporating amendment 2012/01, August 2012.

4. Delgado, I., Dempsey, P., Antolick, L. and Wade, D.: “Continued Evaluation of Gear Condition

Indicator Performance on Rotorcraft Fleet,” Airworthiness, CBM, and HUMS Specialists' Meeting,

February 11-13, 2013, Huntsville, AL.

5. Antolick, L., Branning, J., Dempsey, P. and Wade, D.: “Evaluation of Gear Condition Indicator

Performance on Rotorcraft Fleet,” American Helicopter Society International 66th Annual Forum

2010, Phoenix, AZ, 11-13 May 2010.

6. Dempsey, P.J. and Brandon, E.B.: “Validation of Helicopter Gear Condition Indicators Using

Seeded Fault Tests,” MFPT 2013 Conference, May 13-17, 2013, Cleveland, OH. NASA/TM—2013-

217872. 

7. Dempsey, P.J.: “Investigation of Spiral Bevel Gear Condition Indicator Validation Via AC–29–2C

Using Test Rig Damage Progression Test Data,” NASA/TM—2014-218384, September 2014.

8. U.S. Army Aeronautical Design Standard for Condition Based Maintenance, ADS79 Handbook.

August 2012.

9. Wade, D., and Larsen, C., Roth, R., and Shelley, S., “Final Report of Bearing Condition Indicator

Refinement Project,” Technical Report Rdmr Ae-06-01, June 2011.

10. Massey, F. J. “The Kolmogorov-Smirnov Test for Goodness of Fit,” Journal of the American

Statistical Association. Vol. 46, No. 253, 1951, pp. 68–78.

11. Islam, A., Demspey, P., Feldman, J. and Larsen, C., “Characterization and Comparison of

Vibration Transfer Paths in a Helicopter Gearbox and a Fixture Mounted Gearbox,”

NASA/TM—2013-216586, September 2013.

12. ANSI/AGMA 1010-E95. Appearance of Gear Teeth – Terminology of Wear and Failure.

13. Davies, D.P., Jenkins, S.L. and Belben, F.R.: “Survey of fatigue failures in helicopter components

and some lessons learned,” Engineering Failure Analysis 32 (2013) 134–151.

14. Department of the Army Pamphlet (DA PAM) 738-751 “Functional User’s Manual for the Army

Maintenance Management System – Aviation.”

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