Pilot's Operating Handbook
Section 1
General
Edition 1 - January 15, 2018
Rev. 0
Page 1.4.1
1.4 - Abbreviations and terminology
Met
eorological terminology
ISA : International standard atmosphere
OAT : Outside air temperature
SAT : Static air temperature
QFE : Atmospheric pressure at the airport reference point.
QNH : Atmospheric pressure at sea level, at airplane position.
● NOTE ●
On the ground, the altimeter will indicate zero if it is set to QFE. It will indicate
airport altitude if it is set to QNH.
●
Standard Temperature :
Is 15°C (59°F) at sea level pressure altitude and decreases by
2°C (3.6°F) for each 1000 ft of altitude.
Pressure altitude :
Isthealtituderead from an altimeter whenthe altimeter'sbarometric
scale has been set to 29.92 inches of mercury (1013.2 hPa).
General airspeed terminology and symbols
KCAS : Knots Calibrated Airspeed is the indicated airspeed expressed in
knots corrected for position and instrument error. Knots calibrated
airspeed is equal to KTAS in standard atmosphere at sea level.
KIAS : Knots Indicated Airspeed is the speed shown on the airspeed
indicator and expressed in knots.
KTAS : Knots True Airspeed is the airspeed expressed in knots relative to
undisturbed air which is KCAS corrected for altitude and
temperature.
V
A
: Maneuvering Speed is the maximum speed at which full or abrupt
control movements may be used.
V
FE
: Maximum Flap Extended Speed is the highest speed permissible
with wing flaps in a prescribed extended position.
V
LE
: Maximum Landing Gear Extended Speed is themaximum speed at
which an airplane can be safely flown with the landing gear
extended.
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