Discussion
An airline reports that reverse thrust is being selected below the recommended stowing speed.
What is the principal hazard being risked?
Answer: C
Correct answer: Hot gas and debris being drawn back into the inlet
Below the stowing speed the aircraft is no longer outrunning its own reversed efflux, so the hot gas curls forward and is drawn back into the inlet. Re-ingestion raises the inlet temperature, distorts the flow and can stall the compressor; the same flow field also picks up loose debris from the runway.
The stowing speed exists precisely to prevent this. Directional control, nose gear loading and brake temperature are all real considerations elsewhere, but none is the hazard this limit guards against.
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