SOURCE DOD FLIGHT INFORMATION HANDBOOK
(
https://164.214.2.62/dafif/dafif_0404_ed6/plan/fih.pdf)
3. TEMPERATURE ERRORS (AFFSA/AFFSA LTR)
a. Pressure altimeteres are calibrated to indicate true altitudes under
International
Standard Atmospheric (ISA) conditions. Any deviation from these
standard conditions will result in
an erroneous reading on the altimeter. This error becomes important
when considering obstacle
clearances in temperatures lower than standard since the aircraft’s
altitude is below the figure
indicated by the altimeter.
b. The error is proportional to the difference between actual and ISA
temperature and the
height of the aircraft above the altimeter setting source. Height
above altimeter source is
considered to be published HAT or HAA for the approach. The amount of
error is approximately 4
feet per thousand feet for each degree Celsius of difference.
c. Corrections will only be made for Decision Heights (DHs), Minimum
Descent Altitudes
(MDAs), and other altitudes inside, but not including, the Final
Approach Fix (FAF). The same
correction made to DHs and MDAs can be applied to the other altitudes
inside the FAF.
TEMPERATURE CORRECTION CHART (FEET)
AIRPORT
TEMP °C
0 0 20 20 20 40 40 40 40 60 80 90 110 120 140 180 240
300
-5 10 20 30 30 50 50 60 60 80 110 120 150 160 180 240 320
400
-10 20 20 40 40 60 60 80 80 100 130 150 180 200 230 300
400 500
-15 20 30 50 50 70 80 90 100 120 160 180 220 240 280 360
480 600
-20 20 40 60 60 80 100 100 120 140 180 210 250 280 320 420
560 700
-25 30 50 60 70 90 110 120 140 160 210 240 290 320 370 480
640 800
-30 40 60 60 80 100 120 140 160 180 240 270 330 360 410 540
720 900
-35 40 60 70 90 110 130 150 180 200 260 300 360 400 460 600
800 1000
-40 40 60 80 100 120 140 160 200 220 290 330 400 440 510 660
880 1100
-45 50 70 90 110 140 160 180 210 240 310 360 430 480 550 720
960 1200
-50 60 80 100 120 160 180 200 220 260 340 390 470 520 600 780
1040 1300
200 300 400 500 600 700 800 900 1000 1300 1500 1800 2000 2300 3000 4000
5000
HAT/HAA
NOTE: Must round interpoldated values to nearest 10 feet.
On Sun, 2 May 2004 13:50:02 -0500, smf wrote:
My Altimeter is accurate when on the ground or at lower alt. When I
climb up
to 7k and above and check it against GPS and approach controls read out
it
is about 300+ feet off.
Is it the altimeter I'm having problems with?
Steve
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