Evaluation of the Improved OV-1D Anti-Icing System
Abstract
The U.S. Army Aviation Engineering Flight Activity evaluated the improved OV-1D anti-icing system from 28 January to 21 February 1988 at Duluth, Minnesota. Ten flights (6.5 hours cloud immersion) in artificial conditions and four flights (5.8 hours cloud immersion) in natural conditions were conducted. One enhancing characteristics, nine deficiencies, and three shortcomings were identified. The windshield anti-ice system, when working, enhances safe mission accomplishment. The nine deficiencies were: the inability of the pneumatic deicing system to remove wing and empennage leading edge ice accumulations; the excessive number of AC generator drive shaft failures; the ice accretion characteristics of the engine inlet cowl at temperatures colder than -15 degrees C; the ice accretion and shedding characteristics of the propeller spinner afterbody; the numerous dropouts of one or both windshield anti-ice systems and lack of failure warning to the pilot; the numerous dropouts of the AC generators during flight, the increased pilot workload required to reset them and the distraction caused by illumination of the Master Caution light; the numerous converter dropouts during normal operations, the increased pilot workload required to reset them, and the resulting pilot distractions caused by illumination of the Master Caution light; the numerous inverter dropouts and the ensuing delay and actions required to reestablish flight essential and normal inverter loads; the fact that an anti-ice controller may not be functioning properly and still pass its Operational Readiness Test.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1988
- Accession Number
- ADA198438
Entities
People
- Joseph Miess
- Joseph Piotrowski
- Michael Blacker