Meteorological - Beechcraft C23 SUNDOWNER 180 Pilot Operating Handbook

Section I BEECH CRAFT Sundowner 180
General
-
C23 (M-1285 and After)
METEOROLOGICAL TERMINOLOGY
ISA International
Standard
Atmosphere
in 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
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.
OAT
Outside Air
Temperature
is
the free air
static temperature,
obtained
either
from
inflight
temperature
indica-
tions adjusted
for
instrument
error and compressibility
effects
or ground
meteorological
sources.
Indicated
The number actually read from an
Pressure altimeter
when the
barometric
sub-
Altitude
scale
has been
set
to
29.92
in
Hg. (1013.2 millibars).
Pressure Altitude measured
from standard
Altitude
sea-level
pressure
(29.92
in. Hg) by
a pressure or 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 Graph.
1-14
February
1979