Environmental testing of the YAH-64 helicopter was conducted in the McKinley Climatic Laboratory, Eglin Air Force Base, Florida. The US Army Aviation Engineering Flight Activity was responsible for the evaluation of aircraft systems and the US Army Aviation Development Test Activity was responsible for the mission equipment evaluation. The test consisted of 14.4 hours of aircraft operating time between 2 November and 16 December 1981. Testing was accomplished at 125, 70, -25, and -50 F with the aircraft attached to the hangar floor. At each temperature, testing consisted of preflight inspections, APU and engine starts, simulated mission profiles, engine shut down, and maintenance inspections. Nine deficiencies were found which would preclude mission accomplishment: (1) the fire control computer was unreliable, (2) the symbol generator required an excessive warm-up time at cold temperatures, (3) the heading and attitude reference system was unreliable, (4) the environmental control unit failed to provide adequate heating or cooling to the cockpit and avionics bays at -25 F, -50 F, and 125 F, (5) the TADS/PNVS and weapons systems did not function adequately at 125 F, (6) the APU aborted its start sequence because it could not accelerate the accessory gearbox to operating speed at -25 F and -50 F, (7) the hydraulic hand pump was ineffective at -25 F and -50 F, (8) the utility hydraulic manifold allowed the accumulator to bleed off at -25 F and -50 F, and (9) failure of the hydraulic flex lines at cold ambient temperatures.


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