Transmission Overhaul Estimates for Partial and Full Replacement at Repair

Abstract

Timely transmission overhauls increase in-flight service reliability greater than the calculated design reliabilities of the individual aircraft transmission components. Although necessary for aircraft safety, transmission overhauls contribute significantly to aircraft expense. Predictions of a transmission's maintenance needs at the design stage should enable the development of more cost-effective and reliable transmissions in the future. This work estimates the frequency of overhaul and the number of transmission or components needed to support the overhaul schedule. Two methods based on the two-parameter Weibull statistical distribution for component life are used to estimate the time between transmission overhauls. These methods predict transmission lives for maintenance schedules which (1) repair the transmission with a complete system replacement or (2) repair only failed components of the transmission. An example illustrates the methods.

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Document Details

Document Type
Technical Report
Publication Date
Nov 26, 1991
Accession Number
ADA241587

Entities

People

  • D. G. Lewicki
  • M. Savage

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Aircrafts
  • Army Aviation
  • Data Science
  • Distribution Functions
  • High Reliability
  • Information Science
  • Mechanical Engineering
  • New York
  • Normal Distribution
  • Probability
  • Probability Density Functions
  • Probability Distribution Functions
  • Reliability
  • Spare Parts
  • Statistical Distributions
  • Statistical Functions
  • Statistics

Readers

  • Facility/Structural Engineering.
  • Software Engineering
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).