Critical Parts Program UH-1H, AH-1G, OH-6A, OH-58A, CH-47, and CH-54 Aircraft.

A three-phase Critical Parts Program on the UH-1H, AH-1G, OH-6A, OH-58A, CH-47, and CH-54 aircraft, was implemented to identify parts that had malfunctioned and subsequently caused a flight abort, identify the mode of failure with regard to the identified items, and determine those characteristics of a part that should be closely controlled during manufacture. Of all six aircraft, during specific time periods, the greatest problem areas lie in the engine and transmission systems. The chip detector reports indicate that the chip detectors are functioning properly about 50 percent of the time. Also, less than 16.5 percent of the parts subjected for analysis at CCAD could be identified to an accident report, for each type of aircraft.