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An air start unit (ASU, also known as a "start cart") is a device used to start an aircraft's engines when it is not equipped with an on-board APU or the APU is not operational. [5] There are three primary types of these devices that exist currently: a stored air cart, a gas turbine based unit, and a diesel engine driven screw compressor unit.
An alternative to the fixed hangar is a portable shelter that can be used for aircraft storage and maintenance. Portable fabric structures can be built up to 215 ft (66 m) wide, 100 ft (30 m) high and any length. They are able to accommodate several aircraft and can be increased in size and even relocated when necessary. [citation needed]
An aircraft boneyard or aircraft graveyard is a storage area for aircraft which are retired from service. Most aircraft at boneyards are either kept for storage continuing to receive some maintenance or parts of the aircraft are removed for reuse or resale and the aircraft are scrapped .
An underground hangar complex may include tunnels containing the normal elements of a military air base—fuel storage, weapon storage, rooms for maintaining the aircraft systems, a communications centre, briefing rooms, kitchen, dining rooms, sleeping areas and generators for electrical power.
A Swiss cavern has space to hold 22 F-5 Tiger aircraft. The outside door usually consists of composite material, steel with a wooden core. Past the door is an S-shaped tunnel leading to the main blast doors. The blast doors are made of concrete reinforced steel and as long as they are closed, the aircraft parking area remains fully CBRN protected.
An alternative option, dispersal of aircraft to many different bases, reduces the efficiency of aircraft at both squadron and air force level. Weapons, including nuclear weapons, can be stored in the HAS, sometimes in a vault under the aircraft; e.g., the United States Air Force Weapons Storage and Security System (WS3).
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In 1965, the Military Aircraft Storage and Disposition Center was organized and tasked with processing aircraft for all the United States armed forces, not just the Air Force. The Navy had operated its own boneyard at Naval Air Station Litchfield Park at Goodyear , Arizona, for Navy, Marine Corps and Coast Guard aircraft.