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SECTION I
GENERAL
PIPER AIRCRAFT CORPORATION
PA-28R-201, ARROW
1.19 SYMBOLS, ABBREVIATIONS, AND TERMINOLOGY (continued)
(b) Meteorological Terminology
(
ISA
OAT
Indicated
Pressure Altitude
Pressure Altitude
Station Pressure
Wind
REPORT: VB-1365
1-8
International Standard Atmosphere
In
which:
(I) The air is a dry perfect gas.
(2) The temperature at sea level is 15° Celsi-
us (59
0
Fahrenheit).
.
(3) The pressure at sea level is 29.92 inches
Hg (1013.2mb).
(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
(-0.003564° F) per foot and zero above
that altitude.
Outside Air Temperature is the free air
static temperature, obtained either from
inflight temperature indications or ground
meteorological sources, adjusted for in-
(
strument error and compressibility effects.
The number actually read from an
altimeter when the barometric subscale has
been set to 29.92 inches of mercury (1013.2
millibars).
Altitude measured from standard sea-level
pressure (29.92 in. H g) 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.
Actual
atmospheric
pressure at field
elevation.
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: SEPTEMBER 15, 1988
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