H-42 / TH-55A Osage helicopter trainer
The Hughes model 269A-1 was original designated the HO-2, and later the H-42. As the TH-55A it was selected by the U.S. Army for use as it's primary helicopter trainer in mid-1964. It replaced the Hiller H-23B trainer. It was used to train pilots until about 1984. The TH-55A was powered by a Lycoming 180 hp HIO-360-B1A engine.
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