Piper CHEROKEE ARCHER II Pilot Operating Handbook page 21

SECTION
I
cEf.IERAL
PIPER
AIRC
RAFT CORPORATION
PA.2&I8I,
CHEROKEE ARCHER
tr
(b)
Meteorological Terminology
ISA
OAT
Indicated
Pressure
Altitude
Prcssure
Altitude
Station
Pressure
Wind
lnternational Standard Atmosphere in
u'hich:
The
air
is a
drv
perfect
gas:
The temperature at
sea
lelel is l5o Celsius (59c Fahrenheit):
The pressure
at
sea
level is 29.92 inches hg. (1013.2 mb):
The temperature gradient from
sea
lerel
to
the altitude at uhich
the
temperature
is
-56.5o
C
(-69.7o
F) is
-0.00198o
C
(-0.003564' F) per foot and zero abore that altitude.
Outside
Air
Temperature
is
the
free
air
staiic
temperature,
obtained either
from inflight temperature indications
or
ground
meteorological sour@s, adjusted
for
instrument
error
and
c
ompressibility
e
ffects.
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
presure (29.92 in.Hg)
by
a pressure
or
barometric altimeter.
It
is the indicated pressure
altitude
corrected
for
position and instrument error.
[n
this
handbook, altimeter instnrment 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: JUNE
lt,
1976
REVISED:
MARCH
30,
l9t4
REPORT: vB-790
l-6