The airworthiness aim for a civil aircraft engine is that under all likely flight conditions it will perform adequately or, if it fails, then the rate of failure and type of failure is not such as to jeopardize the safety of the aircraft. It has been generally accepted that aircraft design should be aimed at a catastrophic failure rate for all airworthiness causes not exceeding a probability in the order of 10 to the -7th power per aircraft hour & from this it has been concluded that the airworthiness limit for major engine failures should be that no individual failure of an engine that could be potentially hazardous to an aeroplane should be predicted to occur more frequently than once in 10 to the 8th power engine hours. For lesser failures that only result in an engine shutdown, an in-flight shutdown rate in the order of 0.0001 appears to be acceptable. Service deflects and in-flight shutdown rates must be monitored to insure that an acceptable overall level of reliability is being maintained.

Media Info

  • Pagination: p. 4

Subject/Index Terms

Filing Info

  • Accession Number: 00177424
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jul 29 1978 12:00AM