Beechcraft Duchess 76 - Airspeed Terminology

section I
General
BEECHCRAFT
Duchess 76
AIRSPEED TERMINOLOGY
lAS Indicated Airspeed is the speed of an
airplane
as shown on its airspeed indi-
cator.
As used within this handbook lAS
assumes
no instrument error.
CAS
TAS
GS
YMCA
1-12
Calibrated Airspeed is the indicated air-
speed of
an airplane, corrected for posi-
tion and instrument error. Calibrated
airspeed
is equal to true airspeed in
standard atmosphere at sea level.
True Airspeed is the airspeed of an air-
plane relative to undisturbed air which
is the CAS corrected for altitude, tem-
perature, and compressibility.
Ground Speed is the speed of
an air-
plane relative to the ground.
Air Minimum Control Speed is the
minimum flight speed
at which the air-
plane
is directionally controllable as de-
termined
in accordance with Federal
Aviation Regulations. The airplane cer-
tification conditions include one engine
becoming inoperative and windmilling,
a 5-degree bank towards the operative
engine, take-off power
on operative en-
gine, landing gear up, flaps in take-off
position,
and most rearward C.G. For
some conditions of weight and altitude,
stall
can be encountered at speeds
above YMCA
as established by the cer-
tification procedure described above, in
which event stall speed must be re-
garded
as the limit of effective direc-
tional control.
January 1978
)