UH-1N subsystems tests were flown with three Category II test helicopters. The aircraft was found capable of performing its mission adequately. The airframe, fuselage compartment, flight controls and electric utility system were found to be generally acceptable. Mechanical tail rotor pitch control problems and crew reach difficulties with seat armor installed were notable exceptions. The rescue hoist and cargo suspension unit operated satisfactorily. The loudspeaker system kit proved largely ineffective even after correction of circuitry problems. Early VHF-AM and UHF communications shortcomings were effectively corrected by a TCTO. The AN/ARC-102 receiver-transmitter became inoperative and did not become operational in time for completion of tests. Most other avionics equipment, including navigation aids, proved satisfactory although specifications for such equipment often were not met. Reliability and maintainability figures for onboard systems were determined. The powerplant, transmission, electrical power, flight instruments, VHF-AM transceiver, tacan and UHF-DG systems were identified as reliability problem areas. Engine access was difficult and time consuming and changes to engine cowling and baffle fasteners were recommended. (Author)
UH-1N Category II Airframe and Subsystems Evaluation
1971
172 pages
Report
No indication
English
Aircraft , Helicopters , Flight testing , Airframes , Fuselages , Flight control systems , Radio equipment , High frequency , Transmitter receivers , Aircraft antennas , Tail helicopter rotors , Pitch(Motion) , Helicopter hoists , Navigational aids , Antenna radiation patterns , Loudspeakers , Flight instruments , Helicopter engines , Reliability , Maintainability , Distance measuring equipment , Very high frequency , Performance(Engineering) , Uh-1n aircraft , An/arc-102 , Avionics , Category 2 tests , H-1 aircraft
COMBINED AIRFRAME AND SUBSYSTEMS EVOLVABILITY EXPLORATION DURING CONCEPTUAL DESIGN
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