Chinook is the
US Army's only medium-lift helicopter.
The CH-47 Chinook is a twin-engine, tandem rotor, cargo helicopter.
This helicopter's primary missions are movement of ammunition, repair
parts, petroleum and tactical movement of artillery, troops, and
special weapons on the battlefield.
The Chinook was designed in the 1950's and fielded in 1962. In 1975 a
modernization program was approved to upgrade the CH-47A, B, and C
models into a new "D" model configuration. The modernization includes
new fiberglass rotor blades, transmission and drive systems,
modularized hydraulics, electrical systems, advanced flight controls,
triple hook cargo system, and an auxiliary power unit. These features
greatly enhance reliability, maintainability, productivity,
survivability, and safety of the medium-lift fleet.