AIRPLANE
OPERATIONS
MANUAL
PERFORMANCE
REVISION 35
1-04-05
Page
5
Code
01
GEOMETRIC HEIGHT TO PRESSURE HEIGHT
Pressure altimeters are calibrated to indicate true altitude under
International Standard Atmosphere (ISA) conditions. Any deviation
from ISA will therefore result in an erroneous reading on the altimeter.
In the case when the temperature is higher than ISA the true altitude
will be higher than the figure indicated by the altimeter, and the true
altitude will be lower when the temperature is lower than ISA. The
altimeter error may be significant under conditions of extremely cold
temperature (ICAO PANS-OPS Vol I 3.5.4.5.2).
AERODROME
TEMP.
(
o
C)
HEIGHT ABOVE THE ELEVATION OF THE
ALTIMETER SETTING SOURCE
(feet)
(ft) 200 300 400 500 600 700 800
0 0 20 20 20 20 20 40
-10 202040404060 60
-20 204040608080100
-30 40 60 60 80 100 120 140
-40 40 60 80 100 140 160 180
-50 60 80 100 140 160 200 220
AERODROME
TEMP.
(
o
C)
HEIGHT ABOVE THE ELEVATION OF THE
ALTIMETER SETTING SOURCE
(feet)
(ft) 900 1000 1500 2000 3000 4000 5000
0 40 40 60 80 120 160 200
-10 80 80 120 160 240 320 400
-20 100 120 180 240 360 500 620
-30 160 160 260 340 500 680 860
-40 200 220 320 440 660 880 1100
-50 240 280 400 540 820 1100 1380
NOTE: The tables above are based on aerodrome elevation of 2000 ft;
however, they can be used operationally at any aerodrome.
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