Reversing systems.

CFR · 2024-01-01 · US · Title 14

(a) For turbojet reversing systems— (1) Each system intended for ground operation only must be designed so that during any reversal in flight the engine will produce no more than flight (i) Each operable reverser can be restored to the forward thrust position; and (ii) The airplane is capable of continued safe flight and landing under any possible position of the thrust reverser. (2) Each system intended for inflight use must be designed so that no unsafe condition will result during normal operation of the system, or from any failure (or reasonably likely combination of failures) of the reversing system, under any anticipated condition of operation of the airplane including ground operation. Failure of structural elements need not be considered if the probability of this kind of failure is extremely remote. (3) Each system must have means to prevent the engine from producing more than idle thrust when the reversing system malfunctions, except that it may produce any greater forward thrust that is shown to allow directional control to be maintained, with aerodynamic means alone, under the most critical reversing condition expected in operation. (b) For propeller reversing systems— (1) Each system intended for ground operation only must be designed so that no single failure (or reasonably likely combination of failures) or malfunction of the system will result in unwanted reverse thrust under any expected operating condition. Failure of structural elements need not be consider

official document · source cfr-2024 · id 14:§ 25.933