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Old 8th Sep 2015, 07:52
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vapilot2004
 
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To my thinking, that's actually not quite true.

Thrust reversers are effective down past 75 some knots, but the risk of FOD increases once we are below that, depending on aircraft and engine design. There is truth in that we do know thrust reduction along with stalls or surges are less likely to occur with the same level of reverse on a high bypass engine (mostly fan air) as opposed to a lesser ratio engine.

Brake wear costs are minor compared to maintaining, carrying the weight, and the use of thrust reversers. Early in the landing when the kinetic energy of the aircraft is very high, reverse is most effective when also considering airport noise requirements, maintenance, and fuel costs.
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