(2001) NASA - General aviation aircraft reliability study.pdf - Konstrukcja samolotu - Arasz91

NASA/CR-2001-210647

General Aviation Aircraft Reliability Study

Duane Pettit and Andrew Turnbull

FDC/NYMA, Inc., Hampton, Virginia

February 2001

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NASA/CR-2001-210647

General Aviation Aircraft Reliability Study

Duane Pettit and Andrew Turnbull

FDC/NYMA, Inc., Hampton, Virginia

National Aeronautics and

Space Administration

Langley Research Center

Prepared for Langley Research Center

Hampton, Virginia 23681-2199

under Contract NAS1-96013

February 2001

Available from:

NASA Center for AeroSpace Information (CASI)

National Technical Information Service (NTIS)

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Executive Summary

This reliability study was performed in order to provide the aviation community

with an estimate of Complex General Aviation (GA) Aircraft System reliability. To

successfully improve the safety and reliability for the next generation of GA aircraft, a

study of current GA aircraft attributes was prudent. This was accomplished by

benchmarking the reliability of operational Complex GA Aircraft Systems. Specifically,

Complex GA Aircraft System reliability was estimated using data obtained from the

logbooks of a random sample of the Complex GA Aircraft population.

The approach used to estimate the current reliability of Complex GA Aircraft

Systems included the following:

1. Define benchmark from population of GA aircraft (i.e., Complex GA

Aircraft).

2. Define Complex GA Aircraft Systems.

3. Identify source of failure data.

4. State ground rules and assumptions.

5. Collect data for a random sample of Complex GA Aircraft population.

6. Analyze data to identify proper distribution that models failure data.

7. Perform goodness-of-fit and bias tests to validate distribution fit and verify

sample randomness.

8. Estimate distribution parameters, system reliability, and system hazard rates.

The results of this analysis provide insight into the current reliability of Complex

GA Aircraft Systems. All of the reliability estimates shown below were based on a six-

hour flight. In addition, a ninety-five percent confidence was used to estimate the

reliability of the Airframe, Electrical, Powerplant, Flight Control and Ground Control

Systems. The Cockpit Instrumentation reliability estimate was performed in an earlier

report that is included in Appendix A. All system Reliability estimates are as follows:

System

Reliability Estimate

Airframe

0.99940

Electrical

0.99997

Powerplant

0.99986

Flight Control

0.98476

Ground Control

0.99598

Cockpit Instrumentation

0.976

) was used to

estimate Complex GA Aircraft System reliability. The goodness-of-fit tests and the bias

tests performed indicate that the Weibull distribution best fits the aircraft data for these

systems and that the sample used is not significantly biased. The results indicated that

the random sample of aircraft used, along with the Weibull distribution, was appropriate

for estimating the system reliabilities for the Complex GA Aircraft population.

and

In this report, the Weibull distribution (two-parameter,

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