Boeing CH-46 Columbia FireCH 46 Columbia Helicopters airplane model. Piasecki Aircraft Corporation (PiAC) and Columbia Helicopters have announced a collaboration to upgrade existing Model 107 II (CH 46) tandem rotor helicopters. According to the partners, the new variant, designated the Model 107 III, Will be quite a different beast from the II since the upgrade includes CT 58 engines with 25% more power, glass cockpit, improved AFCS autopilot, improved low maintenance rotor
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