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Artificial and Natural Icing Tests of AH-64. Phase 2
Final rept. Nov-Dec 1986
ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA
Pagination or Media Count:
Natural icing tests were conducted in Nov-Dec 1986 as a continuation of the icing evaluation to establish a moderate icing envelope for the AH-64A apache. The AH-64A ice protection and detectionrate measuring systems were found to be satisfactory and the aircraft demonstrated that it will have the capability to operate safely in icing conditions through the moderate level of intensity following correction of the one deficiency noted during testing. The deficiency was the high potential for engine foreign object damage due to shed ice from the mismatch at the joint between the fore and aft nose gearboxcross shaft fairings. Eleven shortcomings identified included the susceptibility of the helicopter engines to damage due to ice shed from the external airframe components unpredictable failure of the blade deice system due to the design operation of the K-3 contactor relay the potential failure of the deice controller caused by penetration of oil and water into the unit the inadvertent unplugging of the helmet communication cord adn the poor location of the ice protection system advisory lightsanti-ice control panel. No degradation of aircraft handling qualities was noted as a result of aircraft ice accretion. Activation of the engine anti-ice system results in approximately 10 loss in power available and 8 decrease in maximum effective range. Keywords Attack helicopters.
APPROVED FOR PUBLIC RELEASE