Its name, Chinook, is from the Native American Chinook people of Washington state. Early CH-47Ds were originally powered by two T55-L-712 engines, the most common engine is the later T55-GA-714A. The helicopter was unable to be recovered and was destroyed in place. [103] The CH-47J model Chinook (N7425H) made its first flight in January 1986, and it was sent to Kawasaki in April. Some CH-47 "bombers" were equipped to drop tear gas or napalm from the rear cargo ramp onto Viet Cong bunkers. The Chinook is being used in air assault missions, inserting troops into fire bases, and later bringing food, water, and ammunition. Bell model 47 Sioux Description identification pictures gallery observation helicopter from US Army of United States. 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The Future Vertical Lift program plans to begin replacing the Army's rotorcraft fleet in the mid-2030s, initially focusing on medium-lift helicopters, thus the CH-47 is planned to be in service beyond 2060, over 100 years after first entering service. It features the composite-based Advanced Chinook Rotor Blade (derived from the cancelled RAH-66 Comanche), 20% more powerful Honeywell T55-715 engines, and the active parallel actuator system (APAS); the APAS enhances the digital advanced flight-control system, providing an exact torque split between the rotors for greater efficiency. In February 2010, the USAF announced plans to replace aging HH-60G helicopters, and deferred secondary combat search and rescue requirements calling for a larger helicopter. The aircraft was lost on its delivery flight to Canada following gear failure in main combining gear box, caused by undetected metal infraction in gear blank before machining.
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