The definition of the service ceiling is the height above sea level at which an aircraft with normal-rated load is unable to climb faster than 100 feet per minute under standard air conditions.
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All aircraft have a specified 'service ceiling' that defines the maximum height at which it should be operated. For most modern commercial jets today, this is around 41,000 feet.
According to the International Civil Aviation Organization (ICAO), ceiling is the height above ground level (AGL) of the lowest cloud base (bottom of the cloud) that is below 20,000 ft (6,000 m) that is covering MORE than half the sky (i.e. cloud coverage amount is 5/8 or greater; namely, is either broken or ...
From FAA pilot handbook: The service ceiling is the altitude at which the aircraft is unable to climb at a rate greater than 100 feet per minute (fpm). The cruise ceiling, on the other hand, is the altitude at which the maximum climb rate is 300 fpm, though I've not seen it used much.
When it comes to the original crop of the Airbus A320 family, these twinjets have a service ceiling of between 39,100 ft and 41,000 ft. This is between 11,917 m and 12,497 m.
What is the difference between Service Ceiling and Absolute Ceiling? Service Ceiling is the height at which the maximum rate of climb reduces to 100 fpm.Absolute Ceiling is the height at which the rate of climb is reduced to zero (0).
Most commercial aircraft are approved to fly at a maximum of around 42,000 feet, with this maximum figure also being known as a 'service ceiling. ' For example, for the double-decker Airbus A380' superjumbo' quadjet, the service ceiling is 43,000 feet.