The FAA, prompted by a NTSB recommendation, is at long last updating decades-old airline maintenance program development guidance that conflicts with similar, newer material. Advisory Circular (AC) 120-17A, adopted in March 1978 and still active, instructs airlines on creating parts monitoring and replacement schedules, or reliability programs. The guidance is based on 1970-era Maintenance Steering Group-2 (MSG-2) reactive maintenance standards that list hard time, on-condition or ...


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