Meteorological Terminology - Beechcraft Baron G58 Pilot Operating Handbook

Model G58

METEOROLOGICAL TERMINOLOGY

Flight in Icing
Conditions
Indicated
Pressure
Altitude
ISA
OAT
Pressure
Altitude
May, 2015
Flight when the OAT is 5°C (41°F) or colder,
and in the presence of visible moisture.
The number actually read from an altimeter
when the barometric subscale has been set
to 29.92 inches
millibars).
International Standard
which:
(1) The air is a dry perfect gas;
(2) The temperature at sea level is 15°
Celsius (59° Fahrenheit);
(3) The pressure at sea level is 29.92
inches of mercury (1013.2 millibars);
(4) The temperature gradient from sea level
to the altitude at which the temperature is -
56.5°C (-69.7°F) is
-0.00198°C (-0.003566°F) per foot and zero
above that altitude.
Outside Air Temperature is the free air static
temperature, obtained either from the
temperature indicator (IOAT) adjusted for
compressibility effects, or from ground
meteorological sources.
Altitude measured from standard sea-level
pressure (29.92 in. Hg/1013.2 millibars) by
a pressure (barometric) altimeter. It is the
indicated pressure altitude corrected for
position and instrument error. In this
handbook, altimeter instrument errors are
assumed to be zero. Position errors may be
obtained from the Altimeter Correction
graphs.
Section 1
General
of mercury (1013.2
Atmosphere in
1-19