Accession Number : AD0783749

Title :   Simulated Ground-Level STOL Runway/Aircraft Evaluation. Phase III Tests.

Descriptive Note : Final rept. Jun-Jul 73,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Spangler,Roman M. , Jr

Report Date : AUG 1974

Pagination or Media Count : 49

Abstract : 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)

Descriptors :   *Short takeoff aircraft, *Aircraft landings, Approach, Runways, Landing forces, Friction, Angle of attack, Performance(Human), Moisture

Subject Categories : V/STOL

Distribution Statement : APPROVED FOR PUBLIC RELEASE