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Hardened aircraft shelter at RAF Bruggen, 1981 The HASs at RAF Upper Heyford in the United Kingdom are protected as scheduled monuments.. A hardened aircraft shelter (HAS) or protective aircraft shelter (PAS) is a reinforced hangar to house and protect military aircraft from enemy attack.
Weapons Storage and Security System (WS3) is a system including electronic controls and vaults built into the floors of Protective Aircraft Shelters (PAS) on several NATO military airfields all over the world. These vaults are used for safe special weapons storage, typically of tactical B61 nuclear bombs.
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]
A Mirage IIIRS in front of an aircraft cavern in Buochs Airport, Switzerland. An underground hangar is a type of hangar for military aircraft, usually dug into the side of a mountain for protection. It is bigger and more protected than a hardened aircraft shelter (HAS).
A blast pen and memorial at the former RAF Kenley A Hawker Hurricane in a revetment at RAF Wittering in 1940. A blast pen was a specially constructed E-shaped double bay at British Royal Air Force (RAF) Second World War fighter stations, being either 150 ft (46 m) or 190 ft (58 m) wide and 80 ft (24 m) front-to-back, accommodating aircraft for safe-keeping against bomb blasts and shrapnel ...
They were called Hochbunker (literally, "high bunkers"; better translated as "above ground bunkers", to distinguish them from the usual deep i.e. underground air raid shelters) and those that functioned as anti-aircraft artillery platforms were also called Flak towers. Some were over six stories high; several survive to this day because of the ...
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During World War II, the neutral Swiss military airfields were equipped with simple arched concrete U-43 type shelters to protect the aircraft parked underneath. After World War II, starting in 1947, these open objects became even better protected with metal doors, thus creating the U-68 type shelter.