Embraer 175 - Definitions; Temperatures; Indicated Airspeed - Kias; Calibrated Airspeed - Kcas

PERFORMANCE
AIRPLANE
FLIGHT
MANUAL
5-01 CTA APPROVED
Page 2 code 01 REVISION 2
AFM-1385
DEFINITIONS
TEMPERATURES
OUTSIDE AIR TEMPERATURE - OAT or SAT
Free static air (ambient) temperature.
INTERNATIONAL STANDARD ATMOSPHERE - ISA
As accepted by the International Civil Aviation Organization.
ISA DEVIATION - rrISA
Temperature deviation from the standard temperature defined for ISA,
at the specified altitude. Positive rISA means higher temperatures
than the standard.
AIRSPEED
INDICATED AIRSPEED - KIAS
It is reading on the airspeed indicator (knots), as installed in the
airplane, uncorrected for the anemometric system position error. Zero
instrument error is assumed by the CAFM.
CALIBRATED AIRSPEED - KCAS
It is the indicated airspeed corrected for the anemometric system
position error.
EQUIVALENT AIRSPEED - EAS
It is the calibrated airspeed corrected for adiabatic compressible flow
for the particular altitude. At sea level, the equivalent airspeed is equal
to the calibrated airspeed.
TRUE AIRSPEED - TAS
It is the airplane speed in relation to the air and equal to the equivalent
air speed corrected for air density. At sea level, ISA, the true airspeed
is equal to the equivalent airspeed.
GROUND SPEED - GS
It is the airplane speed in relation to the ground. It is the true airspeed
corrected by the wind speed.