TM 55-1510-220-10
VSO
Stalling speed or the minimum steady flight speed in the landing configuration.
Vsse
The safe one-engine inoperative speed selected to provide a reasonable margin
against the occurrence of an unintentional stall when making intentional engine
cuts.
Vx
Best angle of climb speed.
Vxse
Best single-engine angle of climb speed.
Vy
Best rate of climb speed.
Vyse
The best single engine rate of climb speed.
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
compressibility effects.
Indicated
The number actually read from an altimeter when the barometric scale (Kollsman
Pressure
window) has been set to 29.92 inches of mercury 1013 millibars).
Altitude
ISA
International Standard Atmosphere in which:
a. The air is a dry perfect gas.
b. The temperature at sea level is 59 degrees Fahrenheit, 15 degrees Celsius.
c. The pressure at sea 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
understood as the headwind or tailwind components of the actual winds at 50 feet
above runway surface (tower winds).
3. POWER TERMINOLOGY.
Beta Range
The region of the power lever control which is aft of the idle stop and forward
of reversing range where blade pitch angle can be changed without a change
of gas generator RPM.
Cruise Climb
Is the maximum power approved for normal climb. This power is torque or
temperature (TGT) limited.
High Idle
Obtained by placing the condition lever in the HIGH IDLE position.
B-2
