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Information Manual
1-9
Cirrus Design
Section 1
SR22
General
Meteorological Terminology
V
SO
Stalling Speed is the minimum steady flight speed at which
the aircraft is controllable in the landing configuration (100%
flaps) at the most unfavorable weight and balance.
V
X
Best Angle of Climb Speed is the speed at which the
airplane will obtain the highest altitude in a given horizontal
distance. The best angle-of-climb speed normally increases
slightly with altitude.
V
Y
Best Rate of Climb Speed is the speed at which the
airplane will obtain the maximum increase in altitude per unit
of time. The best rate-of-climb speed decreases slightly with
altitude.
IMC
Instrument Meteorological Conditions are meteorological
conditions expressed in terms of visibility, distance from
cloud, and ceiling less than the minima for visual flight
defined in FAR 91.155.
ISA
International Standard Atmosphere (standard day) is an
atmosphere where (1) the air is a dry perfect gas, (2) the
temperature at sea level is 15
C, (3) the pressure at sea
level is 29.92 in.Hg (1013.2 millibars), and (4) the
temperature gradient from sea level to the altitude at which
the temperature is -56.5
C is -0.00198
C per foot and zero
above that altitude.
MSL
Mean Sea Level is the average height of the surface of the
sea for all stages of tide. In this Handbook, altitude given as
MSL is the altitude above the mean sea level. It is the
altitude read from the altimeter when the altimeter’s
barometric adjustment has been set to the altimeter setting
obtained from ground meteorological sources.
OAT
Outside Air Temperature is the free air static temperature
obtained from inflight temperature indications or from ground
meteorological sources. It is expressed in either degrees
Celsius or degrees Fahrenheit.
March 2010