Preliminary Airworthiness Evaluation of a National Aeronautics & Space Administration Automates Stall Warning System for an OV-1 Aircraft
Abstract
The ASWS is an experimental system independent of conventional angle- of-attack sensors. It incorporates an onboard micro-computer which displays stall warning margin information as a function of computed calibrated airspeed and stall airspeed in real time. The test objective was to evaluate the feasibility of an ASWS an installed in the OV-1 and determine compliance of the system with the requirements of MIL-F-8785C. A limited evaluation of the ASWS was conducted at Edwards AFB, CA from 5 Dec 1983 to 1 May 1984. During the test program 33 flights were conducted. In all conditions and configurations tested, the system provided greatly improved stall warning margins when compared to the aerodynamic stall warnings of the OV-1 series aircraft. Adequate stall warnings were provided in most flight configurations tested and the requirements of MIL- F-8785C were met in 156 of the 164 stalls evaluated. System hysteresis and the effects of sideslip on the stall warning capability of the system were minimal and acceptable. Failure of the ASWS to accurately predict single engine stall airspeeds was identified as a deficiency. Additionally, attenuation of the aural warning cue during radio and interphone communications resulted in decreased crew awareness of impending stall and was a shortcoming.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1984
- Accession Number
- ADA152010
Entities
People
- D. L. Underwood
- R. S. Adler