Evaluation of the Improved OV-ID Anti-Icing System. Phase 2
Abstract
The U.S. Army Aviation Engineering Flight Activity re-evaluated the OV-1 modified improved ant-icing system from 6 to 23 March 1989, at Duluth, Minnesota. Six flights (6.4 hours of cloud immersion) in natural icing conditions were conducted. Moderate icing conditions with temperatures less than - 12 degrees C were not encountered. One enhancing characteristic, seven deficiencies and five shortcomings were noted. The windshield anti-ice system enhances safe mission accomplishment. The seven deficiencies are as follows: (1) the failure of the pneumatic deicing system to remove wing and empennage leading edge ice accumulations in moderate icing colder than -10 degrees C; (2) the failure of the anti-icing system to keep the engine inlet clear at temperatures colder than -10 degrees C; (3) the ice accretion and shedding characteristics of the propeller spinner afterbody which may result in ice foreign object damage (FOD) to the engine; (4) the numerous converter dropouts during normal operation; (5) the ice accretion characteristics of the pitot tube which result in erroneous airspeed indications; (6) intermittent failure of the ice detector system to activate the anti-icing system; and (7) the actions required to re-establish flight-essential and normal inverter loads following inverter dropout. Keywords: Converter dropouts; Engine inlet; Ice detector system; Pitot tube; Pneumatic deicing system; Propeller spinner afterbody. (sdw)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1989
- Accession Number
- ADA213928
Entities
People
- Gary Mcvaney
- Joseph C. Miess