TM 1-1510-223-10
Vs
Power off stalling speed or
the minimum steady flight
speed at which the aircraft is
controllable.
Vso
Stalling speed or the mini-
mum steady flight speed in
the landing configuration.
Vyse
The safe one-engine inopera-
tive speed selected to provide
a reasonable margin against
the occurrence of an uninten-
tional stall when making
intentional engine cuts.
Vyse
The best single-engine rate of
climb speed.
B-2. METEOROLOGICAL TERMINOLOGY.
Altimeter Setting
Barometric pressure corrected
to sea level.
°C
Degrees Celsius.
°F
Degrees Fahrenheit
FAT
Free air temperature is the
free air static temperature,
obtained either from ground
meteorological sources or
from inflight temperature
indications adjusted for com-
pressibility effects.
Indicated Pressure Alti- The number actually read
tude
from an altimeter when, the
barometric scale (Kollsman
window) has been set to
29.92 inches of mercury
(1013 millibars).
ISA
International Standard Atmo-
sphere in which:
a. The air is a dry perfect gas.
b. The temperature at sea
level is 59 degrees Fahren-
heit, 15 degrees Celsius.
c. The pressure at seal level is
29.92 inches Hg.
d. The temperature gradient
from sea level to the altitude
at which the temperature is
-69.7 degrees Fahrenheit is
-0.003566 Fahrenheit per foot
and zero above that altitude.
Pressure Altitude
Indicated pressure altitude
corrected for altimeter error.
SL
Sea leveL
Wind
The wind velocities recorded
as variables on the charts of
this manual are to be under-
stood as the headwind or tail-
wind components of the
actual winds at 50 feet above
runway surface (tower
winds).
B-3. POWER TERMINOLOGY.
Cruise Climb
Is the maximum power
approved for normal climb.
This power is torque or tem-
perature (IGT) limited.
Ground Fine
The region of the power lever
control which is aft of the idle
stop and forward of reversing
range where blade pitch angle
and gas generator RPM can
be changed.
High Idle
Obtained by placing the con-
dition lever in the HIGH
IDLE position.
Low Idle
Obtained by placing the con-
dition lever in the LOW IDLE
position.
Maximum Cruise PowerIs the highest power rating for
cruise and is not time limited.
Maximum Power
The maximum power avail-
able from an engine for use
during an emergency opera-
tion.
Normal Rated Climb
The maximum power avail-
Power
able from an engine for con-
tinuous normal climb opera-
tions.
Normal Rated Power
The maximum power avail-
able from an engine for con-
tinuous operation in cruise
(with lower TGT limit than
normal rated climb power).
B-2