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Natural Icing Tests. UH-1H Helicopter.
ARMY AVIATION SYSTEMS TEST ACTIVITY EDWARDS AFB CA
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A limited evaluation of the capability of a modified UH-1H helicopter to fly in a natural icing environment was conducted at Fort Lewis, Washington, from 5 February through 23 February 1974. Testing was performed by the United States Army Aviation Systems Test Activity and consisted of 1.7 hours in icing conditions. During this test, four enhancing features, one deficiency, and one shortcoming were noted. There were four enhancing features associated with special equipment. The deficiency is the inability to maintain autorotational rotor speed within operational limits with main rotor ice accumulation. The striking of the tail rotor by the oscillating iced FM antenna is a shortcoming. Based on these tests, artificial icing characteristics observed in previous UH-1H icing tests are representative of natural icing characteristics. The UH-1H helicopter does not possess the capability to operate safely in an icing environment.
APPROVED FOR PUBLIC RELEASE