Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and AnswersTopic Posted by: Reliability & Maintainability Forum (firstname.lastname@example.org )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Original Message:Posted by: James Bauer (email@example.com )
Date posted: Wed Feb 11 16:58:32 US/Eastern 2004
Subject: LRU undetected failure rates
In performing a system safety analysis for an aircraft installation I used the product manufacturer's Failure Modes and Criticality Analysis as a starting point for my system level analysis. The manufaturer maintains that the undetected failure rate (failures not detected by Built In Test) for LRUs interfaced with the system can be assumed at 5% for digital components and 10% for analog LRUs. Is there any data or documentation to substantiate this position?