Absolute Ceiling
Along with service ceiling and combat ceiling, absolute ceiling is a term used to describe the maximum density altitude that a particular aircraft can operate under Standard Air conditions.
ABSOLUTE CEILING - A less often used term - the highest altitude an airplane can sustain level flight, or altitude above which the cabin pressurization system can no longer maintain a sufficient oxygen level for passengers and crew, ...
ABSOLUTE CEILING - The maximum altitude above sea level at which an aircraft can maintain level flight under Standard Air conditions.
ACCELERATED STALL - Any stall made to occur at other than 1g.
Absolute ceiling. The greatest height which can be reached by an aerodyne or aerostat in Standard Atmosphere. The theoretical height at which the rate of climb is zero.
ABSOLUTE CEILING - The maximum altitude above sea level at which a heavier-than-air craft can be maintained in level flight.
ACLS - (I) Air cushion landing system, or (II) automatic carrier landing system.
Absolute ceiling is the maximum altitude an aircraft can attain. At this point the cruise speed, best climb speed and stall speed all equalize. The aircraft becomes unstable and controls are unable to stabilize flight.
For one thing, it is based on the assumption that all “personal” airplanes have the same absolute ceiling at standard temperature. That's nowhere near true.
At a certain altitude climb performance will reach 100 ft/min on the VSI, the aircraft is then said to have reached its service ceiling. Absolute ceiling will be reached when the RoC is 0 ft/min.
Maximum Rate of Climb, VY ...
The aim of the climb performance experiment is to determine the maximum rates of climb, and the corresponding speeds at different altitudes, and to extrapolate the service and absolute ceilings for airplane.
An aircraft's service ceiling is the density altitude (which see) at which its maximum rate of climb is no greater than 100 feet per minute. Its absolute ceiling is the highest altitude at which it can maintain level flight.
 See also: Flight, Absolute, Weight, Power, Plane
  
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