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Smoke detector mounted on a ceiling. A smoke detector is a device that senses smoke, typically as an indicator of fire.Smoke detectors/alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary.
The RAF selected the HS.1182 for their requirement on 1 October 1971 and the principal contract, for 175 aircraft, was signed in March 1972. [ 3 ] [ 4 ] The prototype aircraft XX154 first flew on 21 August 1974 from Dunsfold piloted by Duncan Simpson , Chief Test Pilot of HSA (Kingston), reaching 20,000 ft in a flight lasting 53 minutes. [ 5 ]