The ground-test vehicle was used to test YAH-63 airframe and dynamic components on control proof loading and rigging, tail rotor whirl test, main rotor retention test, tail rotor driveshaft critical speed run, engine vibration checks, and transmission and drive train bench tests. From Vertiflite, May/June 1975 (page 13).
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Bell YAH-63 ground-test vehicle

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The ground-test vehicle was used to test YAH-63 airframe and dynamic components on control proof loading and rigging, tail rotor whirl test, main rotor retention test, tail rotor driveshaft critical speed run, engine vibration checks, and transmission and drive train bench tests. From Vertiflite, May/June 1975 (page 13).

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