When a jet aircraft captain
decides to fly at an altitude very close to the operational ceiling of the
aircraft, the risks are increased due to the environment of this flight being
within the area called the "coffin corner", which is formed by the
apexes of the stall speed curves and the Mach number curve.
Look in the image showing the
two Cartesians’ curves almost joining at the top of the curves.
All it takes is gusty
turbulence, a steep curve, ice formation, or an incorrect speed adjustment can
push the plane against one of the curves, what means very high possibility to lose
the jet plane flight controls.
You must descend gradually [around 1500 feet per minute] to flight level around 25,000 feet to keep the plane at the safety zone of the envelope formed by the two: stall speed and Mach number Cartesian’s curves.
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