The aircraft, wheels and brakes department at British Airways plc (Middlesex, United Kingdom) is responsible for the repair and overhaul of aircraft brake units on the Boeing 737, 747, 757, 777 and Airbus A319, A320 and A321 aircraft. The brake springs are a critical part of the brake unit because they apply the correct amount of pressure to stop the aircraft. "The brake springs must be tested on every one of each planes' overhauls," says Lionel Fearon, product support engineer at British Airways. Overhauls involve the plane being stripped down, which usually takes place after every 3,000 landings.
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