Revetment (aircraft)

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USAF F-4D Phantom II fighters in their revetments at Ubon Royal Thai Air Force Base, Thailand, c. 1967 F-4s in revetments at Ubon RTAFB.jpg
USAF F-4D Phantom II fighters in their revetments at Ubon Royal Thai Air Force Base, Thailand, c. 1967
F-16 Fighting Falcons fighters in their revetments at Kunsan Air Base, South Korea, 2013 130815-F-MF529-068 (9918729595).jpg
F-16 Fighting Falcons fighters in their revetments at Kunsan Air Base, South Korea, 2013

A revetment, in military aviation, is a parking area for one or more aircraft that is surrounded by blast walls on three sides. These walls are as much about protecting neighbouring aircraft as it is to protect the aircraft within the revetment; if a combat aircraft fully loaded with fuel and munitions was to somehow ignite, by accident or design, then this risks starting a chain reaction as the destruction of an individual aircraft could easily set ablaze its neighbours. The blast walls around a revetment are designed to channel any blast and damage upwards and outwards, away from neighbouring aircraft.

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Blast pen

A blast pen and memorial at the former RAF Kenley Blast pen - RAF Kenley.JPG
A blast pen and memorial at the former RAF Kenley
A Hawker Hurricane in a revetment at RAF Wittering in 1940 Hurricane I 1 Sqn RAF at RAF Wittering 1940.jpg
A Hawker Hurricane in a revetment at RAF Wittering in 1940

A blast pen was a specially constructed E-shaped double bay at British RAF World War 2 fighter stations, being either 150 feet (46 m) or 190 feet (58 m) wide and 80 feet (24 m) front-to-back, accommodating aircraft for safe-keeping against bomb blasts and shrapnel during regular enemy air-attacks.

Although the pens were open to the sky, the projecting sidewalls preserved the aircraft from all lateral damage, with 12-inch (300 mm) thick, 9 feet (2.7 m) high concrete centres, and banked-up earth on either side, forming a roughly triangular section 18 feet (5.5 m) wide at their base. The longer spine section behind the parking areas usually encloses a narrow corridor for aircrew and servicing personnel to employ as an air raid shelter.

Existing examples may still be seen at the present Kenley Aerodrome and at North Weald Airfield, although some pens have had their second bay removed over the years, thus becoming U-shaped rather than E-shaped. There are also a large number at the former RAF Catterick, and some at RAF Wittering. The Imperial War Museum Duxford has one that is accessible to the public. While common on Fighter Command airfields, other RAF Stations such as RAF Benson and RAF Brize Norton did not have any blast pens.

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