Simulated Ground-Level STOL Runway/Aircraft Evaluation. Phase III Tests.
Final rept. Jun-Jul 73,
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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A De Havilland DHC-6 Series 100 Twin Otter was flown by five pilots of varied experience on 7.5 degree steep-gradient approaches onto a ground-level STOL runway. Forty 40 approaches and landings were accomplished using an angle-of-attack indicator airspeed indicator blocked out as primary speed control. Pilot performance as compared to performance with the airspeed indicator as primary speed control was slightly improved. A series of 6 degree steep approaches was made in simulated certification landing tests with dry and wet runways at various water depths. Runway friction, stopping, and landing distances were measured, and stopping distance ratios are shown. Maximum vertical touchdown velocities on steep approaches were also evaluated. Author