Fixing BIT on the V-22 Osprey

The V-22 Osprey measured an unsatisfactory high built-in-test (BIT) false alarm rate of 92% (threshold les 25%) during its first Operational Test And Evaluation Phase (OPEVAL) in 2000. On a good note, the V-22 did exceed its operational objectives for BIT fault detection and fault isolation rates. Afterwards, the Blue Ribbon Panel report identified the need to fix false alarms: "Expedite the plan to reduce the V-22 false-alarm rate in both the aircraft and ground systems, with priority on aircraft software". Correction of false alarms then became a high priority issue on the program. Therefore, a success-oriented engineering approach was developed and implemented to mature the diagnostics system in order to meet the operational requirements