In a limited evaluation to assess degraded hydraulic system collective control limiting of the AH-1S(MC) helicopter equipped with K747 main rotor blades, conducted by the US Army Aviation Engineering Flight Activity (USAAEFA). Testing was conducted at Edwards Air Force Base, California between 5 October and 14 October 1985. Twelve flights were flown totalling 9.5 hours, of which 7.9 hours were productive. One deficiency was identified: the collective control limiting after a hydraulic system failure which if experienced in an out-of-ground effect hover may result in a mishap. Collective control limiting occurred when the minimum value of the collective actuator load reached 1050 + or - pounds. The maintenance test flight (MTF) procedure which was evaluated was unsatisfactory. A recommended MTF procedure, developed during this test, is included.
AH-1S(MC) Degraded Hydraulics Mode Evaluation
1986
57 pages
Report
No indication
English
Aircraft , Hydraulic servomechanisms , Air force facilities , California , Control , Deficiencies , Failure , Flight testing , Hydraulic equipment , Hydraulics , Limitations , Maintenance , Test and evaluation , Attack helicopters , Rotor blades(Rotary wings) , Hovering , Collective Control , AH-1S Aircraft , Out of Ground Effect Hovering , Servo Lockup , K-747 Rotor Blades
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