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Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust for it to act against the forward travel of the aircraft, providing deceleration. Thrust reverser systems are featured on many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing ...
The reverse-thrust ratio (ratio of backward engine thrust to forward reverse thrust) can be as high as 84%. [6] However, this result is obtained with a cowl to attach air flow in a 7° angle and a large enough "target" (deflector door) installed. A reverse-thrust ratio of 55% can be reached on a simple target without the cowl. [7]
To avoid a fatal collision, Miles immediately disengaged reverse thrust and both pilots slammed the throttle levers all the way forward and pulled back on their control columns to abort the 737's landing and initiate a go-around. They pushed so hard on the throttles that Miles fractured his thumb. [6]
[citation needed] The NTSB determined that the probable cause was the pilots' failure to use available reverse thrust promptly to safely decelerate or stop after landing, which resulted in a runway overrun. This failure occurred because the pilots' first experience and lack of familiarity with the airplane's autobrake system distracted them ...
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In addition, a micro-switch, activated by the aircraft's main landing gear leaving the ground, disables the thrust reverser operating circuitry, preventing inadvertent operation of the thrust reverser in flight. Rolls-Royce Tay 650-15 on a Fokker 100 of a type similar to the accident aircraft, with thrust reverser actuated.
After extending the landing gear, the propeller speed began to increase, startling the crew due to the audible noise. The aircraft's speed and altitude then rapidly dropped. The crew realised that the reverse thrust had been deployed in mid-flight and tried to save the aircraft.
Japan Airlines Flight 350, a DC-8, crashed in 1982 short of the runway in Tokyo, after the captain attempted suicide during the final approach phase of the flight by putting the inboard engines into reverse thrust. Of the 174 people aboard, 24 died.