SECTION 1
GENERAL
TBM
700 PILOT’S OPERA TING HANDBOOK
Page 1.4.1
Rev. 2
1.4 -- ABBREVIATIONS AND TERMINOLOGY
METEOROLOGICAL TERMINOLOGY
ISA : International standard atmosphere
OAT : Outside air temperature is the free air static temperature. It
is expressed in either degrees Celsius or degrees
Fahrenheit.
SAT : Static air temperature
IOAT : Indicated outside air temperature
QFE : Atmospheric pressure at the airport reference point.
QNH : QFE value corrected according to the airport altitude.
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 :
Is the altitude read from an altimeter when the altimeter’s
barometric 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.
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