Accession Number:

ADA038076

Title:

Estimation of Engine Removal Times and Prediction of Replacement Requirements.

Descriptive Note:

Final rept. 1 Dec 75-30 Sep 76,

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION DEPT OF INDUSTRIAL ENGINEERING

Personal Author(s):

Report Date:

1976-12-01

Pagination or Media Count:

146.0

Abstract:

The report contains a review of the actuarial method for estimation of engine lives, a suggestion to reduce the variance of the estimate by using variable age intervals, a description of alternative estimators that use all data on engine removal ages, a comparison of estimators, a sequential two sample test for obtaining representative data set of engine lives, a review of the actuarial method and a simulation program for predicting replacement requirements, a next event simulation program for predicting engine requirements, and suggestions for more comprehensive models of engine performance and replacement. The first appendix contains the derivation of the maximum likelihood estimator for engine lives from a multiple risk model with a progressively censored sample. The second appendix describes variance reduction by antithetic variates for a next event replacement simulation. The third appendix describes the next event type simulation of operation of a fleet of aircraft with a single type of engine.

Subject Categories:

  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE