Anecdotal experiences on the value of limited environmental testing for the analysis of “No Fault Found” assemblies

Electronic assemblies that fail on an aircraft often will not fail on a laboratory tester or will exhibit random and hard to pinpoint failures. This is a discussion of environmental testing types, why environmental testing is needed, and a brief review of several such assemblies and test systems and what extra environmental testing was performed to identify issues that were not identifiable under normal testing.