M
ETEOROLOGICAL TERMS
ISA I
NTERNATIONAL
S
TANDARD
A
TMOSPHERE
,
IN WHICH
:
-
T
HE AIR IS DRY PERFECT GAS
-
T
HE TEMPERATURE AT SEA LEVEL IS
15°C
-
T
HE TEMPERATURE GRADIENT FROM SEA LEVEL TO THE
ALTITUDE AT WHICH THE OUTSIDE AIR TEMPERATURE IS
-56.5°C
IS
-0.00198°C
PER FOOT AND ZERO ABOVE THAT
ALTITUDE
.
MSL
M
EAN
S
EA
L
EVEL
.
OAT
O
UTSIDE
A
IR
T
EMPERATURE
;
F
REE AIR STATIC TEMPERATURE
,
O B TA I N E D E I T H E R F R O M O N B O A R D T E M P E R AT U R E
INDICATORS OR GROUND METEOROLOGICAL SOURCES
.
QNH
T
H E O R E T I C A L AT M O S P H E R I C P R E S S U R E AT
M S L ,
CALCULATED FROM THE ELEVATION OF THE MEASURING
POINT ABOVE
MSL
AND THE ACTUAL ATMOSPHERIC
PRESSURE AT THE MEASURING POINT
.
P
RESSURE
A
LTITUDE
A
LTITUDE ABOVE
MSL
INDICATED BY A BAROMETRIC
ALTIMETER SET TO STANDARD PRESSURE
(1013.25
H
P
A
),
CORRECTED FOR INSTRUMENT ERRORS
.
D
ENSITY
A
LTITUDE
P
RESSURE ALTITUDE CORRECTED FOR TEMPERATURE
S
TATION
P
RESSURE
A
CTUAL ATMOSPHERIC PRESSURE AT FIELD ELEVATION
.
W
IND
W
IND VELOCITIES USED AS VARIABLES IN THIS MANUAL ARE
TO BE REGARDED AS HEAD OR TAILWIND COMPONENTS OF
THE REPORTED WINDS
.
Van’s RV7
Aircraft Flight
Manual
Rev 0.1
S/N 74141
Aircraft Flight
Manual
I-MKLK
GENERAL
I-MKLK AIRCRAFT FLIGHT MANUAL 1.0 10