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Flight Evaluation of the Army/NASA Variable Stability Fly-by-Wire Rotorcraft Aircrew Systems Concept Airborne Laboratory (RASCAL) JUH-60ANASA Ames Research Center and the U.S. Army Aeroflight dynamics Directorate (AFDD) have performed initial flight evaluations of the Research Flight Control System (RFCS) integrated into the Army/NASA Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) JUH-GOA. The highly modified JUH-GOA Black Hawk helicopter is a full authority, high bandwidth, variable stability, in-flight simulator designed to support development of advanced flight control, sensor, and integrated display and control technologies in a fail safe environment. Preparation for flight test required an extensive hazard analysis and ground testing to ensure proper system operation. A hardware in the loop development facility was utilized to evaluate control law stability following
software changes, assess servo hardover upset conditions during manual and monitor disengagements and provide pilot familiarization of test techniques and software changes prior to flight. First engagement of the RFCS was conducted on 31 Aug 2001. RFCS transfer system operation, envelope expansion and a limited rate monitor evaluation have been completed with low bandwidth and model following control laws. The presentation will discuss the following

- System overview including aircraft modifications and integrated development facilities used with the RASCAL facility.
- Preliminary hazard identification and mitigation prior to flight test.
- Ground testing used to qualify the RFCS transfer system and verify fault monitor operation.
- Flight test results of low-bandwidth and model following control law evaluations including maneuver agility, control limitations, fault monitor reliability, and recovery from manual and monitor disengagement.
- Lessons learned including test techniques using a passive three-axis sidearm controller, the value of the development facility in reducing risk and crew coordination issues related to the operation of a full authority, variable stability platform.
- Future research and modifications planned for the RASCAL aircraft.
Document ID
20030064883
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Dave Arterburn
(United States Army Arlington, Virginia, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Research And Support Facilities (Air)
Meeting Information
Meeting: US Navy Test Pilot School Annual Reunion
Location: Patuxent River, MD
Country: US
Start Date: April 19, 2002
Sponsors: United States Department of the Navy
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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