ABBREVIATIONS AND TERMS
For the purpose of this manual, the following abbreviations and terms apply. See appropriate technical manuals for
additional terms and abbreviations.
B-1. Airspeed Terminology.
Calibrated airspeed is indicated airspeed corrected for position and instrument
Feet per minute.
Ground speed, though not an airspeed, is directly calculable from true airspeed if
the true wind speed and direction are known.
Indicated airspeed is the speed as shown on the airspeed indicator and assumes
True airspeed is calibrated airspeed corrected for temperature, pressure, and
Maneuvering speed is the maximum speed at which application of full available
aerodynamic control will not overstress the aircraft.
Design flap speed is the highest speed permissible at which wing flaps may be
Maximum flap extended speed is the highest speed permissible with wing flaps in
a prescribed extended position.
Maximum landing gear extended speed is the maximum speed at which an
aircraft can be safely flown with the landing gear extended.
Maximum landing gear operating speed is the maximum speed at which the
landing gear can be safely extended or retracted.
Lift off speed (takeoff airspeed).
The minimum flight speed at which the aircraft is directionally controllable as
determined in accordance with Federal Aviation Regulations. Aircraft certification
conditions include one engine becoming inoperative and windmilling; a 5 bank
towards the operative engine; takeoff power on operative engine; landing gear
up; flaps up; and most rearward CG. This speed has been demonstrated to
provide satisfactory control above power off stall speed (which varies with weight,
configuration, and flight attitude).
Maximum operating limit speed.
Never exceed speed.