Preliminary Airworthiness Evaluation RU-21H Guardrail V Aircraft.
Abstract
The RU-21H (GR V) exhibited 1 deficiency and 10 shortcomings which will degrade its overall capability. The single-engine minimum-control airspeeds (V sub MC) were 5 to 10 knots greater than the data provided in the operator's manual. The incorrect V sub MC data presented in the operator's manual are a deficiency which warrants further testing and, as an interim measure, requires that a WARNING be incorporated in the operator's manual. Ten shortcomings listed in order of importance, are: (1) The dissimilar sense of operation of the attitude indicators; (2) the excessive glare in the cockpit caused by the navigation lights mounted on the upper surfaces of the external wing-tip pods; (3) the inaudibility of the stall warning horn when wearing helmet and oxygen mask; (4) the low intensity of the MASTER CAUTION and MASTER WARNING lights; (5) the inefficient arrangement of navigation and communications radios; (6) the premature activation of the artificial stall warning device; (7) the inability to shut down the engine by use of the condition lever; (8) the lightly damped, easily excited phugoid; (9) the ineffective lateral trim; and (10) the excessive force required to operate the radio/intercom switch. Within the scope of this test, the flying qualities of the RU-2H (GR V) aircraft are acceptable.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1978
- Accession Number
- ADA068347
Entities
People
- Frederick S. Doten
- John R. Niemann
- Raymond B. Smith
- William A. Norton