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BEECHCRAFT
Oebonair
C33
Bonanza
E33
and F33
Sectionl
General
METEOROLOGICAL TERMINOLOGY
ISA
OAT
'lndicated
Pressure
Altitude
Pressure
Altitude
August
1982
International Standard Atmosphere
in
which
(1
l 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
in
Hg. ( 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
inflight
temperature indica-
tions adjusted
for
instru ment
error and compressibility effects,
or
ground meteorological sources.
The number actuallv read
from
an
altimeter
when
the barometric sub-
scale has been set to
29.92
in
Hg.
( 1013.2 millibars).
Altitude measured
from
standard
sea-level pressure (29.92 in. Hg) by
a pressure or barometric altimeter.
lt
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 Graph.
1-15
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