1.4 - Abbreviations and Terminology
Meteorological Terminology
ISA
International Standard Atmosphere
IMC
Instrument Meteorological Conditions
VMC
Visual Meteorological Conditions
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.
Standard
temperature
15 °C (59 °F) at sea level pressure altitude, decreasing by 2 °C
(3.6 °F) for each 1,000 ft of altitude.
Pressure
altitude
The altitude read from an altimeter when the altimeter's
barometric scale has been set to 29.92 inches of mercury
(1,013.2 hPa).
General Airspeed Terminology and Symbols
KCAS
Knots Calibrated Airspeed
: 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
: the speed shown on the airspeed
indicator and expressed in knots.
KTAS
Knots True Airspeed
: the airspeed expressed in knots relative
to undisturbed air which is KCAS corrected for altitude and
temperature.
V
A
Maneuvering Speed
: the maximum speed at which full or
abrupt control movements may be used.
V
FE
Maximum Flap Extended Speed
: the highest speed
permissible with wing flaps in a prescribed extended position.
V
LE
Maximum Landing Gear Extended Speed
: the maximum
speed at which an airplane can be safely flown with the landing
gear extended.
V
LO
Maximum Landing Gear Operating Speed
: the maximum
speed at which the landing gear can be safely extended or
retracted.
Section 1
General
Pilot's Information Manual
PIM TBM 960 - Edition 0
Rev. 00
Page 1.4.1
PIM - DO NOT USE FOR FLIGHT OPERATIONS