Certified Professional Controller (CPC) Knowledge Test

What is 'coffin corner' and which aircraft type is most susceptible?

A narrow speed range at high altitude between stall speed and MMO where there is little margin; affects high-altitude jets An area of airspace near mountains with no escape route The low-speed, high-drag regime during approach; affects all aircraft A difficult visual approach segment; affects large aircraft

Correct Answer:

A narrow speed range at high altitude between stall speed and MMO where there is little margin; affects high-altitude jets

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