Piper Turbo Saratoga PA-32-301T Pilot's Manual page 31

PIPER
AIRCRAFT
CORPORATION
SECTION 1
PA-32-301T, TURBO
SARATOGA GENERAL
(b)
Meteorological Terminology
ISA
International Standard Atmosphere in
which the air is a dry perfect
gas,
the
temperature
at sea level
is 15° Celsius
(59°
Fahrenheit),
the
pressure
at sea
level is
29.92 inches Hg
(1013.2
mb); 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
indications
or ground
meteorological
sources,
adjusted
for
instrument
error
and compressibility
effects.
Indicated Pressure
The
number actually reads from
an
Altitude
altimeter when the
barometric subscale has
been
set to
29.92 inches of mercury
(1013.2
milibars).
Pressure
Altitude Altitude
measured
from standard 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.
Station
Pressure
Actual atmospheric
pressure
at
field
elevation.
Wind The
wind velocities
recorded
as
variables
on
the
charts of this
handbook
are to
be
understood
as the headwind or tailwind
components
of the
reported
winds.
ISSUED:
JANUARY 10, 1980 REPORT: VB-1070
REVISED:
OCTOBER 10, 1983 1-9