TM 55-1510-215-10
Vs
Power off stalling speed or the minimum steady flight speed at which the aircraft
is controllable.
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.
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 compressibility effects.
Indicated Pressure
The number actually read from an altimeter when, the barometric scale
Altitude
(Kollsman window) has been set to 29.92 inches of mercury (1013 millibars).
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 Centigrade;
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.
(press alt}
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).
B-2
