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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]
Typically constructed of metal, they are primarily used for private aircraft at general aviation airports because they are more economical than rectangular hangars. There are two types of Tee hangars: standard (sometimes called stacked) and nested. Standard Tee hangars provide additional storage area and can use rolling doors. In the diagram ...
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.
Passenger boarding stairs, sometimes referred to as boarding ramps, stair car or aircraft steps, provide a mobile means to traverse between the aircraft doors and the ground. Because larger aircraft have door sills 5 to 20 feet (1.5 to 6.1 m) high, stairs facilitate safe boarding and deplaning.
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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However, the apron is not usually open to the general public, and a permit may be required to gain access. An apron's designated areas for aircraft parking are called aircraft stands. [4] By extension, the term apron is also used to identify the air traffic control (ATC) position responsible for coordinating movement on this surface at busier ...