Coffin Corner occurs at an aircraft’s Absolute Ceiling, where the aircraft can neither slow down without stalling nor speed up without exceeding the aircraft’s maximum operating speed. In other words, this is where the stall speed is equal to the max operating speed. It is the only speed, at that certain altitude, that allows a steady and level flight.
A blog run by a group of IFATC that educates Infinite Flight air traffic controllers and pilots about controlling and flying.
