Discussion
Assertion (A): Thrust reversers are stowed above a specified ground speed rather than held to a stop.
Reason (R): Below that speed the reversed efflux can be re-ingested by the inlet.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason is why the limit exists. As the aircraft slows it no longer outruns its own reversed efflux, so the hot gas curls forward and can be drawn back into the inlet.
Re-ingestion raises inlet temperature, distorts the flow into the compressor and risks a surge; the same flow field lifts debris from the runway towards the engine. Stowing at a specified ground speed avoids both, at the cost of giving up the last of the reverse thrust when it is least effective anyway.
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