### Frequency of Failure (Random or Constant Failure Rate) Service History (Total number of failures during selected service history time frame; includes minor events or outcomes below Level 3, and Levels 3, 4, and 5 events) 82 Fleet Exposure (Selected service history time frame in years ) 11 Fleet Exposure (Fleet size during selected service history time frame) 3045 Fleet Exposure (Avg annual usage: flight hours/airplane/year or flights/airplane/year) 140 Frequency of failure (total # of failures during selected time frame / (selected time frame x fleet size x avg annual usage)) 1.75E-05 Hazard Ratios

# of failures during selected service history time frame that resulted in Level 5 outcomes 2 # of failures during selected service history time frame that resulted in Level 4 outcomes (includes Level 4 and Level 5 outcomes) # of failures during selected service history time frame that resulted in Level 3 outcomes (includes Level 3, Level 4, and Level 5 outcomes) Hazard Ratio, Level 5 (# of Level 5 failures / total # of failures during selected time frame) 0.02 Hazard Ratio, Level 4 (# of Level 4 failures / total # of failures during selected time frame) Hazard Ratio, Level 3 (# of Level 3 failures / total # of failures during selected time frame) Uncorrected Individual Risk

Frequency of Level 5 outcomes (frequency of failure x Level 5 hazard ratio) 4.E-07 Frequency of Level 4 outcomes (frequency of failure x Level 4 hazard ratio) Frequency of Level 3 outcomes (frequency of failure x Level 3 hazard ratio) Fleet Exposure (Future)

Short-term:

Expected number of airplanes in fleet over the next one year period 3045 Avg annual usage: flight hours/airplane/year or flights/airplane/year 140 Expected number of airplanes in fleet over the next one year period x avg annual usage x 1 year 4.26E+05 Long-term:

Expected number of airplanes in fleet over the next 20 year period 3045 Avg annual usage: flight hours/airplane/year or flights/airplane/year 140 Expected number of airplanes in fleet over the next one year period x avg annual usage x 20 years 8.53E+06
Uncorrected Fleet Risk

Short-term Fleet Risk

Number of Level 5 Outcomes (frequency of Level 5 outcomes x short-term exposure) 1.82E-01 Number of Level 4 Outcomes (frequency of Level 4 outcomes x short-term exposure) Number of Level 3 Outcomes (frequency of Level 3 outcomes x short-term exposure) Long-term Fleet Risk

Number of Level 5 Outcomes (frequency of Level 5 outcomes x long-term exposure) 3.64E+00 Number of Level 4 Outcomes (frequency of Level 4 outcomes x long-term exposure) Number of Level 3 Outcomes (frequency of Level 3 outcomes x long-term exposure) 

# SARA Worksheet Systems/Propulsion Revision 1: 03/02/2011 Date: ASE: Office: Phone: Class of Aircraft ( I, II ): Make: ECi cylinder failures Model/Series: SINGLE AND TWIN ENGINE Serial Numbers: Reason for A/W Concern: Engine inflight shut down1.E-08 1.E-07 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02

1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08Frequency of Level 5 Events, Number of Eventsper Hour (cycle)

Exposure, Fleet Hours (cycles) 

### Guidelines for Class I Airplanes (single engine less than 6000 lbs)

Short Term Long Term

SAIB or other action Emergency or IAR

NPRM Emergency or IAR (if more than 0.7 events expected in next 1 year period)1.E-09 1.E-08 1.E-07 1.E-06 1.E-05 1.E-04 1.E-03

1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08Frequency of Level 5 Events, Number of Eventsper Hour (cycle)

Exposure, Fleet Hours (cycles) 

### Guidelines for Class II Airplanes (twin engine less than 6000 lbs)

Short Term Long Term

SAIB or other action Emergency or IAR

NPRM Emergency or IAR (if more than 0.5 events expected in next 1 year period)