1.3 Abbreviations and definitions
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 flight rules.
VFR Visual flight rules.
ISA International standard atmosphere.
MAC Mean aerodynamic chord.
VTU Vertical tail unit (fin with rudder).
HTU Horizontal tail unit (stabilizer with elevator).
VADesigned manoeuvring velocity.
VSO Stalling velocity in landing configuration.
VS1 Stalling velocity with flaps up.
VNE Never exceed velocity.
VFE Maximum velocity with flaps fully extended
VF0 Maximum velocity for flap extending and retracting.
RWY Runway
POH Pilot Operating handbook
LSA Light sport aircraft
Note: Unless otherwise stated, the indicated airspeeds in the manual are
CAS.