A fault and failure analysis (F/FA) is and evaluation procedure that analyzes and assesses the effects of and documents potential failures on system operation, identifies failures critical to operational success for personnel safety, and ranks each potential failure according to the combined influence of its effect and its probability of occurring. The use of F/FA in design has grown with the expansion of technology. In the past, failure mode and effect analysis (FMEA) has been considered and used in a possible restricted way. Now, however, other analytical procedures should be described and their application explained. This revision of Aerospace Recommended Practice (ARP) 926 takes into account current technology and explains various methods of F/FA and their application. It presents fault and failure analysis procedures in their broad scope as design analysis tools. From this perspective, specialized analyses such as the FMEA and fault-tree analysis are considered as individual types of analyses within the broad scope of F/FA methodology.