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Absolute ceiling is not a fixed number and may change from flight to flight, and even within the same flight. It depends on conditions at altitude, loading of the aircraft, etc. A lightly loaded aircraft may be able to push the envelope higher than one that is heavily loaded. That is why the number that is published is the service ceiling, which is ...


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From prof. Wittenberg's half-a-century-old lecture book, paper copy only, translation and interpretation fully on my account. Way before any A320 family aeroplane... The pic is relevant for propeller aeroplanes, and indicates a theoretical ceiling (max climb speed = 0) that is about 5% higher than the service ceiling (max climb speed = 100 ft/min). The ...


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