ORLI
Č
AN M-8 EAGLE
PILOT'S OPERATING
REVISION NO. 05
DATE OF ISSUE: MAY 02,
TERMINOLOGY
PAGE
OF
10
14
3. TERMINOLOGY
3.1. GENERAL AIRSPEED TERMINOLOGY AND SYMBOLS
CAS
Calibrated Airspeed is indicated airspeed corrected for position and instrument error.
Calibrated airspeed is equal to true airspeed (TAS) in standard atmosphere at sea level.
KCAS
Calibrated Airspeed expressed in “knots”.
IAS
IndicatedAirspeedisthespeedshownontheairspeed indicator
KIAS
Indicated Airspeed expressed in “knots”.
TAS
True Airspeed is the airspeed relative of an airplane to undisturbed air which is the CAS
corrected for altitude, temperature and compressibility.
GS
Ground Speed is the speed of an airplane relative to the ground.
V
A
Design Maneuvering Speed is the maximum speed at which application of full available
aerodynamic control will not overstress the airplane.
V
0
Maximum Operating Maneuvering Speed is the maximum speed the airplane maybe stalled
without exceeding structural limitations.
V
FE
Maximum Flap Extended Speed is the highest speed permissible with wing flaps in a
prescribed extended position.
V
N0
Maximum Structural Cruising Speed is the speed that should not be exceeded except in
smooth air and then only with caution.
V
NE
Never Exceed Speed is the speed limit that may not be exceeded at any time.
V
S
Stalling Speed or the minimum steady flight speed is the minimum speed at which the
airplane is controllable.
V
S0
Stalling Speed or the minimum steady flight speed at which the airplane is controllable in the
landing configuration at the most forward center of gravity.
V
X
Best Angle of Climb Speed is the airspeed which delivers the greatest gain of altitude in the
shortest possible horizontal distance.
V
Y
Best Rate of Climb Speed is the airspeed which delivers the greatest gain in altitude in the
shortest possible time.
3.2. METEOROLOGICAL TERMINOLOGY
OAT
Outside Air Temperature is the free air static temperature obtained from inflight temperature
indications or from ground meteorological sources. It may be expressed in either degrees
Celsius or degrees Fahrenheit.
ST
Standard Temperature is 15°C at sea level pressure altitude and decreases by 2°C for each
1000 feet of altitude.
PA
Pressure Altitude is the altitude read from an altimeter when the altimeter's barometric scale
has been setto 29.92 inches of mercury (1013 mb).
IMC
Instrument Meteorological Conditions are meteorological conditions expressed in terms of
visibility, distance from cloud, and ceiling less than the minima for visual flight defined in FAR
91.155.
VMC
Visual Meteorological Conditions
ISA
International Standard Atmosphere (standard day) is an atmosphere in which
(1) The air is a dry perfect gas,
(2) The temperature at sea level is 15° C (59 °F),
(3) The pressure at sea level is 29.92 InHg (1013.2 mb),
(4) The temperature gradient from sea level to the altitude at which the temperature is -56.5° C (-69,7
°F) is - 0.00198° C (- 0.003564 °F) per foot and zero above that altitude.
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