ALTIMETER TEMPERATURE CORRECTIONS
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Joined: Jan 2000
Aviation Qualifications: ATP+Mil
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From: Norfolk
ALTIMETER TEMPERATURE CORRECTIONS
Having done a Google search and studied the ICAO tables, I was wondering whether any PPruner knows a good rule of thumb for calculating altimeter error in extremely cold temperatures. Thanks in advance.
Joined: Aug 2000
Posts: 3,648
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From: UK
Originally Posted by Hofmeister
Having done a Google search and studied the ICAO tables, I was wondering whether any PPruner knows a good rule of thumb for calculating altimeter error in extremely cold temperatures. Thanks in advance.
Joined: Feb 2005
Posts: 30
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From: france
Delta Alt true = Delta Alt ind +/- (4 x ( T - T std) x Delta Alt ind) / 1000
Delta Alt is the air layer from wich you have to correct the temperature
( ie if the aircraft is at 2000 ft sea level but at 1000ft over the ground, you wil have to correct 1000ft)
+ if temp over std
- if temp below std
Ex: Aircraft 2000ft above the groun on std - 25 ( indicated temp at 2000ft= -14 deg cel) => true alt = 2000 - (4 x 25 x 2000) / 1000 = 1800 ft
Delta Alt is the air layer from wich you have to correct the temperature
( ie if the aircraft is at 2000 ft sea level but at 1000ft over the ground, you wil have to correct 1000ft)
+ if temp over std
- if temp below std
Ex: Aircraft 2000ft above the groun on std - 25 ( indicated temp at 2000ft= -14 deg cel) => true alt = 2000 - (4 x 25 x 2000) / 1000 = 1800 ft
