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NDIP-1142 Rev. A Effective 03-04-2013 

P&W PROPRIETARY INFORMATION ECCN 9E991 - EXPORT CONTROLLED 

Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document

1

PW2000 Diffuser/HPT Case

M-Flange/Bolt hole 

Eddy Current Inspection 

(On-Wing / Module /Disassembled Component)

NDIP–1142 Rev. A 

WARNING 

THIS DOCUMENT MAY CONTAIN INFORMATION SUBJECT TO THE INTERNATIONAL TRAFFIC IN ARMS REGULATION (ITAR) OR THE EXPORT 

ADMINISTRATION REGULATION (EAR) OF 1979. THIS INFORMATION MAY NOT BE EXPORTED, RELEASED, OR DISCLOSED TO FOREIGN NATIONALS 

OUTSIDE THE UNITED STATES WITHOUT FIRST COMPLYING WITH THE EXPORT LICENSE REQUIREMENTS OF THE INTERNATIONAL TRAFFIC IN 

ARMS REGULATION (ITAR) AND/OR THE EXPORT ADMINISTRATION REGULATION (EAR). A VIOLATION OF THE ITAR OR EAR MAY BE SUBJECT TO A 

PENALTY OF UP TO 10 YEARS IMPRISONMENT AND A FINE OF $1,000,000 UNDER 22 U.S.C 2778 OR SECTION 2410 OF THE EXPORT 

ADMINISTRATION ACT OF 1979. INCLUDE THIS NOTICE WITH ANY REPRODUCED PORTION OF THIS DOCUMENT. 

RESTRICTION 

PAGES OF THIS DOCUMENT MARKED WITH THE NOTICES SET FORTH BELOW CONTAIN CONTRACTOR COMPETITION SENSITIVE DATA AND/OR 

PRATT & WHITNEY PROPRIETARY DATA WHICH IS SUBMITTED IN CONFIDENCE. NO DISCLOSURE OR USE OF THIS INFORMATION IS PERMISSIBLE 

WITHOUT PRIOR WRITTEN CONSENT OF UNITED TECHNOLOGIES CORPORATION EXCEPT FOR OFFICIAL PURPOSES WITHIN THE U.S. 

GOVERNMENT. 

DOCUMENT PROPERTY RIGHTS NOTICE 

THIS DOCUMENT IS THE PROPERTY OF UNITED TECHNOLOGIES CORPORATION (UTC). YOU MAY NOT POSSESS, USE, COPY OR DISCLOSE THIS 

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NOTICES 

P&W PROPRIETARY INFORMATION ECCN 9E991 - EXPORT CONTROLLED 
NDIP-1142 Rev. A Effective 03-04-2013 

P&W PROPRIETARY INFORMATION ECCN 9E991 - EXPORT CONTROLLED 

Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document

2

PW2000 Diffuser/HPT Case 

M-Flange/Bolt hole

Eddy Current Inspection 

(On-Wing / Module /Disassembled Component)

NDIP–1142 Rev. A 

Instructions described within this procedure do not replace, amend or supersede any 

instructions included in other Pratt & Whitney technical publications. Active Service 

Bulletins and other technical publications issued by Pratt & Whitney reflect official 

company procedures and policies. 

Approved by: David A. Raulerson

Issue Date: 03/04/2013
NDIP-1142 Rev. A Effective 03-04-2013 

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Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document

3

PW2000 Diffuser/HPT Case 

Eddy Current Inspection 

(On-Wing / Module /Disassembled Component)

I. GENERAL: 

 The purpose of this eddy current inspection is to detect flaws in the OD Strap of 

the Diffuser/HPT Case. This inspection is conducted in two parts. The initial OD 

strap inspection is conducted 360 ̊ around the outer circumference of both the 

diffuser as well as the HPT Case (contingent on the configuration not being a 

scalloped flange). The second inspection is a bolt hole inspection that is designed 

to confirm the initial OD indication and subsequently evaluate any ID defects that 

may be of interest. 

 The inspection sequence consists of a full OD strap inspection, where any 

anomaly noted requires the removal of the flange bolt at that given location. A bolt 

hole inspection is then required on those specific bolt hole(s). The confirmation of 

the OD strap indication using the bolt hole inspection is required, and the 

disposition of the ID indication(s) is based on the amplitude. 

 This inspection is intended to be performed on-wing, but can be performed at the 

module or piece part level. The inspection requires 360 ̊ access to the “M” Flange 

which requires the disassembly of certain brackets. The flange has to be 

thoroughly cleaned after gaining access to the entire circumference of the flange. 

The access requirements vary by engine model as well as configuration. Refer to 

the required technical data for engine preparation and disassembly/reassembly 

instructions. 

Both the primary flange and secondary bolt hole inspections are performed by a 

handheld eddy current test utilizing the UniWest US-454 eddy current instrument. 

The bolt hole inspection uses a UniWest ECS-1 handheld rotator to drive the 

rotary contact bolt hole probe during that portion of the inspection. 

The OD strap is inspected by an eddy current probe using an absolute shaped 

coil technology operating at 400kHz. The subsequent bolt hole inspection is 

conducted by an eddy current probe using a differential coil technology 

operating at 2.25MHz.
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4

The inspection sequence is as follows: 

3⁄4 Confirmation of 360 ̊ Access to Case 

3⁄4 Visual Inspection of Physical Damage (Dings/Dents etc.) 

3⁄4 Pre–inspection preparation 

3⁄4 Numbering of Bolt Holes on Diffuser Case 

3⁄4 Pre–inspection calibration procedure 

3⁄4 Inspection procedure

3⁄4 Evaluation procedure 

3⁄4 Re-Inspection of indications 

3⁄4 Post–inspection calibration procedure 

3⁄4 Accept/Reject analysis 

3⁄4 Report completion 

This procedure is provided as an inspection training guide. Refer to the approved 

Technical Data for current requirements. 

Pratt & Whitney technical data describing part inspections using a UniWest US454 eddy current instrument is written with a level of detail that assumes the basic 

instrument is properly configured and tested by the manufacturer, and that the 

qualified NDT inspectors using it are familiar with operating the instrument in 

accordance with the UniWest US-454 System User Manual. 

II. REFERENCES:

A. Standard Practices Manual, P/N 585005 

B. PW2000 Engine Manual P/N 1A6231 

C. Applicable PW2000 Engine Manual Sections 

D. UniWest US-454 Eddy Current User Manual 

III. INSPECTOR QUALIFICATIONS: 

Inspectors performing this inspection to determine part airworthiness must be 

qualified in accordance with the Standard Practices Manual, P/N 585005, Section 

70-37-02, Eddy Current Inspection requirements for personnel qualification. It is 

also recommended that twenty four (24) hours of instruction and familiarization 

with test equipment, probes, and inspection technique take place. The final 

inspector qualification is contingent upon conducting and passing the POD study 

during the specified training period. Re-training is required after the inspector has 

been inactive in conducting the inspection for more than 6 months. 
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5

IV. PROCEDURE:

A. EQUIPMENT REQUIRED 

Figure 1 UniWest US-454 Eddy Current Instrument 

1. Required non-PWA Equipment

a) US-454 Eddy Current Instrument 

b) Flash Card Reader 

c) US-2923 OD Flange Probe with the following guides 

(1) 83645-2 Front Guide (Required)

(2) 83645-3 Short Rear Guide (Optional)

(3) 83645-4 Long Rear Guide (Optional)

Front Guide 

(Required)

Rear Guides (2) & (3) 

(Optional)

Coil Location
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6

Figure 2 US-2923 OD Flange Probe 

d) UniWest ECS-1 Bolt Hole Rotator

Figure 3 UniWest ECS-1 Bolt Hole Rotator 

e) US-2926 UniWest Bolt Hole Probe

Figure 4 UniWest US-2926 Bolt Hole Probe 

NOTE: The above-denoted US-454 Eddy Current Instrument and 

accessories are available from the following supplier: 

 UniWest 

 122 South 4th Avenue 

 Pasco, WA 99301 

 USA 

 Tel: (509) 544-0720 

 Fax: (509) 544-0868 
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7

2. Other Required Tools; 

a. NDIP 1142 Inspection kit. To include scotch brite, clipboard, TEC (Trace 

Element Certified) Sharpie Markers, silver pencils, ink pen, data sheets.

b. Calibration Standard and accompanying Calibration Card 

Figure 5 Calibration Standard 

V. CONFIRMATION OF 360 ̊ CASE ACCESS 

1. Confirm that there is unobstructed access to the entire 360 ̊ of the case that 

needs to be inspected. The removal requirements are listed in the accompanying 

Service Bulletin.

VI. INSPECTION DATASHEET 

1. The inspection data sheet can be found on the last page of this procedure. 

VII. VISUAL INSPECTION OF PHYSICAL DAMAGE 

Warning: If physical damage prevents the OD flange probe from seating 

properly on the flange, the default is to conduct the bolt hole inspection on all 

affected holes that are un-inspectable with the OD flange probe. 

1. Visually inspect the entire 360 ̊ of the case for dings/dents/raised material 

and note the location of any observed damage. Any interference on the OD of the 

case that impedes the OD probe from inspecting the entire OD bolt hole 

circumference as seen in Figure 9 should be marked on the inspection datasheet as 

damage noted and inspected utilizing the bolt hole inspection.

NOTE: If the observed damage location is precisely along the center line of bolt 

hole, only that bolt hole requires inspection using the bolt hole inspection. If the 

damage is offset to the center line of a bolt hole, the adjacent bolt hole in the 

offset direction also needs to be inspected using the bolt hole inspection. If there 

are any doubts in the integrity of the OD inspection or there is liftoff observed due 
NDIP-1142 Rev. A Effective 03-04-2013 

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Use or disclosure of the data contained in this sheet is subject to the restriction on the title page of this document

8

to physical anomalies on the OD, the bolt hole inspection would be considered a 

requirement on those bolt holes. 

VIII. INSPECTION PREPARATION 

1. Ensure all necessary steps have been taken to ensure lock-out/tag out of 

the engine prior to inspection. Also ensure the engine temperature is cool or 

ambient. This should be achieved by allowing the engine to cool at least 4 hours 

prior to inspection. If the temperature is not sufficient at the time of inspection, 

forced air cooling or heating should be performed. Temperature limit for this 

inspection shall be limited to 40-110 degrees F.

2. Ensure that all required externals required to be removed as identified in 

the accompanying Service Bulletin have been completed. 

3. Once 360 ̊ access has been gained, clean the entire “M” Flange using 

ScotchBrite and wipe it down with alcohol.

4. Identify Hole Position #1(Top Dead Center) by counting clockwise from 

Hole Position #8 FWD-looking-AFT as seen in Figure 6 and mark with a white 

paint pen. Label every 5th hole with a white paint pen on the case of interest for 

visible identification of holes.

Figure 6 M-Flange Bracket Reference to locate Top Dead Center (TDC)

Hole Pos. #8 
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9

IX. PRE-INSPECTION CALIBRATION OD FLANGE INSPECTION 

1. Cover the eddy current probe sensor with a smooth wrinkle free layer of Kapton 

tape. Tape should be applied across the entire contact face of the probe. Trim any 

excess tape with a razor blade. 

2. Connect the probe to the US-454 eddy current instrument. Turn on the instrument 

and allow 5 minutes to warm up. 

3. Set the US-454 to the following initial settings for calibration: 

Frequency: 400 KHz 

Gain: As required 

Probe Drive: High 

Low pass Filter: 200 Hz 

High pass: 0 Hz. 

Display: I-Plane 

Rotation Degrees: Vertical notch 

Response (as 

required)

X Sensitivity 0.5 V/div 

Y Sensitivity 0.5 V/div 

X-Null Position 1.0 Div 

Y-Null Position -3.5 Div 

Persist (PERST) 2.0-3.0 Sec (as 

desired)

Figure 7 Probe Calibration Picture 

4. Place the Probe on Calibration standard as shown in Figure 7 and Press the Null 

button 

Scanning

Direction
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10

5. Traverse the probe on the Calibration standard as seen in Figure 7 to obtain the 

calibration signal on the EDM notch. 

6. Make adjustments to the phase angle until the signal is vertical. Vertical being 

defined as the top peak being on the same vertical line with the bottom point as 

shown by the asterisks in the picture. Repeat scanning operation as many times as 

necessary until signal appears similar to Figure 8 and the amplitude is as noted on 

Calibration Card supplied with the standard. 

NOTE: Once phase angle is determined which achieves vertical notch 

response signal, do not make any further modifications to the phase angle 

setting for the remainder of the inspection. 

Figure 8 Vertical Notch Response 

7. Calibrate the probe to the amplitude depicted on the calibration card to within 

±0.5 Divisions.

NOTE: With this probe the direction of scanning does not influence notch 

response so either scan direction is acceptable.

Notch Calibration 

Amplitude (as seen 

on Calibration Card) 

*

*
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11

8. Fill in the required information on the inspection data sheet documenting probe 

S/N, calibration standard S/N, and calibration settings.

X. UTILIZING THE REAR PROBE GUIDES 

NOTE: In order to allow more stability when scanning on the OD flange 

inspection, the probe has two optional adjustable guides. It is not required to use 

these guides while performing the inspection, however, it is intended to add more 

stability if desired. 

1. Null the probe with only the front guide installed when seated properly on 

the case. 

2. Install the rear guide of choice without completely tightening the screws 

for the guide. Place the probe on the case and ensure that the null point on the 

screen returns to the X=1.0 Div and Y=-3.5Div, press on the rear guide until it is 

in firm contact with either the intermediate case or the opposing M-flange case to 

the one being inspected. Tighten the guide screws.

3. Remove and re-place the probe on the case, scan the OD surface slightly 

and ensure that probe is not rocking and the null point does not shift while 

scanning.

4. While performing the inspection with the rear guide, the guide might need 

to be re-adjusted if the null point shifts beyond 1.5Div in any direction on the 

screen while scanning.

XI. INSPECTION PROCEDURE OD FLANGE 

NOTE: Ensure that all required items in the “INSPECTION 

PREPARATION” section are completed prior to starting the inspection 

process.

1. Inspect all non-bracketed areas of the 360 ̊ of the OD Strap focusing on 

the bolt hole pattern circumference as shown in Figure 9 on the “M” 

Flange of the suspect case. During the inspection process, if any 

indications are noted, optimize the phase to achieve maximum vertical 

amplitude. If any indications greater than 3.0 Divisions after optimizing 

the phase response are identified, document the amplitude in the 

inspection sheet. Place an “X” mark adjacent to the Hole of interest for 

future identification of bolt hole Inspection. Make sure to return the 

phase angle to the calibration phase angle prior to continuing the 

inspection. Continue inspecting the remainder of the case until all bolt 

hole pattern circumferences have been inspected on the OD. 
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12

Note: Some indications may have a different phase response given the 

characteristics of the flaw observed such as small versus large, surface versus 

sub-surface etc. 

Figure 9 Primary Focus Area & Response interpretation 

2. Check inspection calibration by scanning the calibration block as seen in 

the inspection calibrations section.

Note: If the calibration value observed is not within ±0.5 Divisions of the 

calibration amplitude, re-calibrate and repeat the areas inspected since the 

last observed good calibration. Also, check tape wear on contact surface and 

determine if replacement is needed prior to recalibrating the probe. 

3. Remove the guides from the probe and inspect all remaining areas of the 

360 ̊ of the OD Strap focusing on the bolt hole pattern circumference as 

shown in Figure 9 on the “M” Flange of the suspect case. During the 

inspection process, if any indications are noted, optimize the phase to 

achieve maximum vertical amplitude. If any indications greater than 

3.0 Divisions after optimizing the phase response are identified, document 

the amplitude in the inspection sheet. Place an “X” mark adjacent to the 

Hole of interest for future identification of bolt hole Inspection. Make 

sure to return the phase angle to the calibration phase angle prior to 

continuing the inspection. Continue inspecting the remainder of the case 

until all bolt hole pattern circumferences have been inspected on the OD. 

4. Check inspection calibration by scanning the calibration block as shown in 

the inspection calibration section.

OD Bolt Hole Pattern 

Circumference

Lift off 

Calibration 

Notch

Response

Small Flaw 

Response
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13

Note: If the calibration value observed is not within ±0.5 Divisions of the 

calibration amplitude, re-calibrate and repeat the areas inspected since the 

last observed good calibration. Also, check tape wear on contact surface and 

determine if replacement is needed prior to recalibrating the probe. 

XII. POST-INSPECTION CALIBRATION OD FLANGE 

1. Re-scan the Calibration Block as shown in the Pre-inspection calibration 

section and record the noted amplitude on the datasheet. The post inspection 

amplitude should be within ±0.5 Divisions of the calibration amplitude. 

XIII. ECS-1 ROTATOR ANGULAR POSITION INTERPRETATION 

NOTE: For the purpose of this inspection, it is imperative that the operator 

thoroughly understand the positioning logic of the ECS-1 Rotator. While 

performing the inspection, if the positioning is not understood completely, then 

the inspection could result in a high number of false rejects with huge impact on 

the customer as well as the inspection disposition.

1. The ECS-1 Rotator has a position encoder which synchronizes with the 

screen position. The Position orientation of the Bolt Hole scanner is as shown 

below;

Figure 10 Bolt Hole Rotator Scanner Encoder Position 

2. While performing the inspection, the bolt hole scanner assembly may have 

to be rotated to accommodate for the inspection, it is recommended that the 

scanner be rotated in increments of 90 ̊ such that the OD strap location and ID 

location are readily calculated. 

0 ̊/360 ̊

90 ̊

180 ̊

270 ̊

+
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14

3. The angular position decoder should always be placed on the instrument 

while using the ECS-1 

4. Each division on the screen corresponds to a 36 ̊ sector. A rotation of the 

scanner to the right is +36 ̊ and to the left is -36 ̊.

5. The indication location should be measured by the first maximum positive 

peak location as shown in Figure 13 below. 

XIV. BOLT HOLE INSPECTION CALIBRATION 

1. Plug in the ECS-1 scanner cable to the instrument, and the other end to the 

ECS-1 handheld scanner. 

2. Cover the eddy current probe sensor with a smooth wrinkle free layer of 

Teflon tape. Tape should only be applied across the sensor of the probe only. PreCut before application, do not try to cut the tape while on the probe. 

3. Insert some foam into the Bolt Hole Probe slit near the sensor side so the 

compression is firmer. 

4. Plug in the US-2926 Bolt Hole Probe into the scanner. 

5. Place the Angular position decoder on the instrument screen as shown in 

Figure 13 ; 

6. Adjust the US-454 instrument settings to as seen below; 

Frequency: 2.25 MHz 

Gain: As Required 

Probe Drive: High 

Low pass Filter: 600 Hz 

High pass: 230 Hz. 

Display: O-Scope 

Rotation Degrees: Vertical notch Response (As 

Required)

X Sensitivity 0.5 V/div 

Y Sensitivity 0.5 V/div 

O-Scope Trigger Scanner 

Sample Rate 10850 s/sec 

Oscilloscope Y 

Data Buffer Circular 

7. Scan the calibration block as seen in the Figure 11below. Ensure that the 

response observed is vertical as shown in Figure 12. Notice that the material noise 

observed is slightly off normal when the notch response is adjusted to be vertical.
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15

Figure 11 Bolt Hole Inspection Calibration

Figure 12 Phase Adjustment of Notch to Vertical

8. Change the instrument Display from I-Plane to O-Scope, ensure that the notch observed 

is located at 180 ̊ as seen in Figure 13. 

Notch

Response

Material Noise 

Response
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16

Figure 13 Notch Response O-Scope mode 

XV. BOLT HOLE INSPECTION OF OD FLANGE INDICATIONS 

NOTE: This inspection requires re-taping and re-calibrating the probe after 

each individual bolt hole is inspected.

1. Inspect all bolt holes that exhibited an OD Flange indication one at a time 

using the bolt hole rotator. The primary focus area for this bolt hole inspection is 

the OD and ID Strap locations ±36 ̊ which is equivalent to ±1 Division on the 

instrument. 

NOTE: The Angular locations for the OD-Strap and ID-Strap are contingent upon 

how the ECS-1 is being held during the bolt hole inspection and is as defined in 

the “ECS-1 rotator angular position interpretation” section. It is the responsibility 

of the inspector to determine the location of OD-Strap and ID-Strap angular 

locations prior to inspecting each bolt hole. The ECS-1 rotator is marked with 

Angular positions to assist with this. It is highly advised to determine how the 

rotator will be held during a given bolt hole inspection and determining the 

calculated locations for the OD and ID ahead of time. This will provide a focal 

angular location of interest on the instrument display that can easily be 

interrogated within ±1 Division.

2. If there is confirmation of a large OD-Strap indication from the bolt hole 

(>6 Division), inspect both the Diffuser case flange side as well as the HPT case 

flange from their respective sides on both the OD and ID sides. Document the 

location(s) and amplitude(s) for each observed indication and disposition per the 

Accept/Reject Criteria.

Angular

Position

Decoder

Angular

Location 
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17

3. If there is no Confirmation of the OD-Strap indication on the suspect case 

side, inspect the ID area of interest on the suspect case. Ensure that there are no 

indications of noticeable amplitude on the suspect case on the ID side. If there are 

indications noted on the ID, record observed amplitudes on the datasheet and 

disposition per the Accept/Reject Criteria. 

4. Repeat steps 1-3 for all bolt holes identified using the OD flange 

inspection on the suspect case side unless noted otherwise. 

NOTE: If there are more than five bolt holes that require inspection, it is 

recommended that the probe go through post calibration after every fifth hole. At 

which time the probe should be re-taped and the calibration process be repeated. 

In the event that the tape on the probe tears, all holes inspected since last 

calibration will have to be re-inspected starting from the probe calibration process. 

XVI. BOLT HOLE INSPECTION POST CALIBRATION 

1. Re-scan the Calibration Block as shown in the bolt hole pre-inspection 

calibration section and record the noted amplitude on the datasheet. The post 

inspection amplitude should be within ±0.5 Divisions of the calibration amplitude. 

XVII. ID INDICATIONS NOTED 

1. If there are any indications noted on the ID side of any case, the indication 

can be polished per the “Bolt hole Polishing” procedure in Section 0.

2. Re-inspecting indications is required after the polishing process using the 

same bolt hole inspection as laid out in Sections XIV thru XVI. Document all post 

polishing amplitudes for each of the bolt holes. Disposition according to the 

Accept/Reject Criteria. 

XVIII. ACCEPTANCE AND REJECTION CRITERIA 

1. Using the datasheet of all indications noted, identify all the bolt holes that 

have an ID bolt hole ECI indication of notable amplitude. These bolt holes must 

be polished and re-inspected in accordance with sections 0 and XIV thru XVI 

respectively.

2. Size all the final observed ID bolt hole ECI indication amplitudes using 

Table 1 below; 

3. If the final ID indication amplitude requires an FPI per Table 1, follow the 

steps in Section XX “FPI PROCESSING OF BOLT HOLE”. After completion of 

that process, disposition as required in Table 2 for the observed flaw size during 

the FPI process.

4. Trace through the disposition flow chart as shown in Figure 14 for all 

indications noted on both the OD flange indications as well as the bolt hole 

inspection indications for disposition. 
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18

Note: If there are multiple Bolt holes that have indications and are noted to 

have different cycle time dispositions per the criteria provided, the lowest 

cycle time is the allowable flying limit for the recurring inspection. At which 

point all indications that require recurring inspections should be reviewed as 

well. 

Warning: If a single indication on a given case requires the removal of the 

case that constitutes an immediate removal regardless of additional 

indications being acceptable for a period of time. 

FPI for Sizing Disposition Remaining Time

<6 Divs No Re-inspect within 500 Cycles

6<12 Divs No Re-inspect within 250 Cycles

>12 Divs YES

Final Bolt Hole 

ID ECI Amplitude

ECI Disposition Table

FPI Location and Utilize FPI Disposition

Table 1 ECI Indication Disposition Table 

Disposition Remaining Time

>12 Divs 0.050"<0.100" Re-inspect within 250 Cycles

>12 Divs 0.100"<0.170" Re-inspect within 120 Cycles

>12 Divs 0.170" Remove Prior to Further Flight 0 Cycles

FPI Disposition Table

Final Bolt Hole 

ID ECI Amplitude

FPI Indication 

Size on Face

Table 2 FPI Indication Disposition Table 

Figure 14 Disposition Flow Chart 

XIX. BOLT HOLE POLISHING 

Required tools; 

1. Dremel Cordless Rotary Tool (as provided in the kit) 

2. Dremel 90 ̊ angle attachment (as provided in the kit) 
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19

3. Abrasive polishing tips(Extra Fine Black Colored Tips, Fine Red Colored 

Tips all are as included in kit) 

4. Mandrels (as provided in the kit)

5. Polishing Tips (White mandrel mounted polishing attachment as provided 

in the kit) 

1. Attach the Dremel 90 ̊ angle attachment to the Dremel cordless rotary tool. Refer to 

the attachment manual for explicit instructions. 

2. Attach either the extra fine or fine abrasive polishing tip onto the screw mandrel and 

install that assembly into the Dremel 90 ̊ attachment. 

3. Polish the bolt hole with the observed indication no longer than 45 seconds at a time 

and no more than twice per each bolt hole. Ensure uniform coverage on the entire 

bore section of the bolt hole. The RPM setting on the Dremel tool should not exceed 

the 10,000 RPM setting. 

4. Clean the bolt hole with a cotton swab wet with a SPOP 208 (Task 70-21-00-110-

040) solvent to remove all unwanted material 

XX. FPI PROCESSING OF BOLT HOLE 

NOTE: Use ultra high sensitivity (Level 4) penetrant 

(1) Clean the area with a cotton swab wet with a SPOP 208 (Task 70-21-00-110-040)

solvent to remove all unwanted material. Refer to 70-21-00, SPOP 208 (Task 70-21-00-

110-040). Do not use too much solvent on the area. 

(2) Apply the applicable penetrant ultra high, with a cotton swab from the corner of the 

bolt hole to across the flange face. 

NOTE: Do not mix different types or brands of penetrant.

Penetrant PMC Options 

PMC 4354-1, PMC 4354-2, PMC 4354-3, PMC 4354-4, PMC 4354-6, PMC 4354-7, or 

PMC 4354-8

(a) Drain/dwell for 20 - 60 minutes 

(4) Clean the surfaces with a cloth or paper towel and SPOP 208 solvent to remove 

surface penetrant. Refer to 70-21-00, SPOP-208 (Task 70-21-00-110-040). Do not use 

too much solvent on the surfaces. 

NOTE: It is very important to prevent too much solvent wiping, which can remove too 

much penetrant from a part. 

(5) Examine the surfaces for full removal of penetrant under ultraviolet light (UVL).

(6) Very lightly apply one of the developers that follow: 

(b) Dry Developer (PMC 4356).

NOTE: Developer should be applied using dry bulb. 

 (7) Let the developer absorb the penetrant for 10 minutes, minimum. 
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20

CAUTION: INSPECTION MUST BE DONE IN A DARKENED AREA. WHITE 

LIGHT MUST NOT BE MORE THAN 2 FOOTCANDLES (20 LUX) AT THE 

INSPECTION SURFACE OF THE PART.

(8) Examine the part under UVL. Make a mark around each indication and questionable 

area (that is, an area that possibly shows an unsatisfactory condition). 

(9) Do the subsequent procedure on all areas that show a moderate fluorescent 

background, and on all questionable or marginally unacceptable areas: 

(a) Lightly rub the area with a soft brush or cotton swab that is moist with a 

SPOP 208 solvent. Refer to 70-21-00, SPOP-208 (Task 70-21-00-110-040).

Do not use too much solvent on the area. 

(b) Let the solvent on the surface dry, and then examine area again under UVL. 

(c) If the indication shows again immediately, then the indication is a result of 

a discontinuity. If you cannot easily see the initial mark around the indication, 

apply a new mark around the indication. 

(d) If the indication does not show again immediately, do the subsequent 

procedure:

 1 Apply PMC 4356 dry developer to the area.

 2 Examine the area again under UVL. 

 (10) Size the observed FPI indication using the following nomenclature, prior to 

disposition;

Figure 15 FPI Indication Sizing 
NDIP-1142 Rev. A Effective 03-04-2013 

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21

XXI. REVISION TRACKING 

Revision Letter Revision Date Changes Revision By 

A 3/4/13 Yellow Highlighted 

Areas 

A. Ahmed 

 
NDIP-1142 Rev. A Effective 03-04-2013 

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22

APPENDIX A