In most modern airliners, its use is banned in the air because it could lead to undesirable flight characteristics that might cause a loss of control. The reverse thrust of an aircraft is normally used after landing as a means of braking.
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A: Some of the early generation jets, such as the DC-8, allowed for in-flight reversing of the inboard engines. No modern jets have this feature. Airplanes have safety locks that prevent reverse thrust from being activated in flight.
Most airlines deploy thrust reversers on every landing. The thrust reverser operating guidelines are well established and are typically based on inputs from the airframe manufacturer. Although most airlines deploy thrust reversers on every landing, the level of reverse thrust used is left to the pilots discretion.
In addition to reversers and wheel brakes, ground spoilers are deployed to 'dump lift', and effectively secure the aircraft on the runway. Whilst it's not required to use reverse thrust in some circumstances, most large passenger aircraft will deploy it on landing.
A380s are designed to come to a complete stop using their brakes alone. Ultimately the decision was made to put reverse thrust on two engines to help minimize the risk of aquaplaning. But it was also decided that reverse thrust on all four of the A380 engines was definitely overkill.
Effectiveness. The amount of thrust and power generated are proportional to the speed of the aircraft, making reverse thrust more effective at high speeds. For maximum effectiveness, it should be applied quickly after touchdown. If activated at low speeds, foreign object damage is possible.
The A320 thrust reversers contribute to both the aircraft and propulsion system performance: they are aerodynamic, robust, and contribute to the braking process of the aircraft. An after-sales service is available 24/7.
Because of its vast size, crossing the Pacific Ocean requires a staggering quantity of fuel. However, most commercial aircraft do not fly directly over the Pacific Ocean; instead, they choose what are known as 'curved paths'. These paths offers a faster, more efficient route given the curved nature of the earth.
Lauda Air Flight NG 004, OE-LAVA Boeing Model 767-300ER, powered by Pratt and Whitney PW4000 engines and operated by Lauda Air, experienced an uncommanded thrust reverser deployment of the left engine during climb out from Bangkok International Airport in Bangkok, Thailand.
Reverse thrust is typically applied immediately after touchdown, often along with spoilers, to improve deceleration early in the landing roll when residual aerodynamic lift and high speed limit the effectiveness of the brakes located on the landing gear.
Fighter jets are designed with maneuverability and speed in mind. A thrust reversal system comes with a mass penalty. This can reduce both the speed and maneuverability. They also increase the complexity of the maintenance process.
Among other things, this means descending to a lower altitude and, potentially, reducing the airplane's speed. If all of an airplane's engines fail simultaneously, the pilot will perform an emergency landing.
The Concorde supersonic airliner could use reverse thrust in the air to increase the rate of descent. Only the inboard engines were used, and the engines were placed in reverse idle only in subsonic flight and when the aircraft was below 30,000 ft (9,100 m) in altitude.