Abbreviations and de nitions1.6.
CAS Calibrated airspeed. It is IAS corrected by errors due to instrument and pitot port errors. CAS is equivalent to
the true airspeed at zero level of international standard atmosphere.
IAS Indicated airspeed. It is the reading of the in-built airspeed indicator corrected by the instrument error.
TAS True airspeed. It is the aircraft velocity considering “undisturbed” air.
IFR Instrument fl ight rules.
VFR Visual fl ight rules.
ISA International standard atmosphere.
MAC Mean aerodynamic chord.
VTU Vertical tail unit (fi n with rudder).
HTU Horizontal tail unit (stabilizer with elevator).
V
S0
Minimal allowed velocity in landing confi guration.
V
S1
Stalling velocity with fl aps up.
V
F0
Maximum velocity for fl ap extending and retracting.
V
FE
Maximum velocity with fl aps fully extended.
V
A
Designed maneuvering velocity.
V
C
Velocity of cruising fl ight.
V
L0
Maximum velocity for landing gear extending and retracting.
V
H
Maximal speed of horizontal fl ight.
V
NE
Never exceed velocity.
RWY Runway
LG Landing gear
EPS Emergency Parachute System
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