Category 2 Performance Test of the UH-1N Helicopter. Volume 1
Final rept. 17 Nov 1970-16 Feb 1972
AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA
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This report presents the results of the UH-1N Category II performance tests conducted to obtain data for the Flight Manual. In general, hover, climb, level flight, and takeoff performance equaled or exceeded that estimated in the Flight Manual the exception being level flight at low weight andor altitude. Level flight tests with external armament resulted in a 5- to 10-percent reduction in range capability depending on loading. The UH-1N had excellent single-engine performance resulting in a relatively small AVOID area on the height-velocity curve. A single-engine go-around was possible at all conditions outside a well defined CAUTION area. Slope landing tests were made on slopes up to 17 degrees. The standard airspeed system would not register airspeeds below 15 to 20 knots, and there were position errors of up to 9 knots in level flight and 7 knots in climb. Discrepancies in the engine power indicating systems were found to be sufficient to possibly cause an unnecessary replacement of a satisfactory engine.