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Cold Temperature Altitude Corrections

 
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K.Haroon
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Joined: 11 Dec 2005
Posts: 1296

PostPosted: Thu Feb 07, 2008 2:30 am    Post subject: Cold Temperature Altitude Corrections Reply with quote

If outside air temperature (OAT) is different from standard atmospheric temperature (ISA), barometric altimeter errors result due to non-standard air density. Large temperature differences from standard result in large altimeter errors. If the temperature is warmer than ISA, true altitude is higher than indicated altitude and if the temperature is colder than ISA then true altitude is lower than indicated altitude. Extremely low temperatures create significant altimeter errors and greater potential for reduced terrain clearance. These errors increase with higher airplane altitudes above the altimeter source.

For Operators:

Operators should consider altitude corrections when altimeter errors become appreciable, especially where high terrain and/or obstacles exist near airports in combination with very cold temperatures i.e. -30 deg C or colder. Operators should also consider correcting en route minimum altitudes and/or flight levels where terrain clearance is a factor. In some cases corrections may be appropriate for temperatures between 0 deg and -30 deg C.

For Pilots:

Pilots should note that for very cold temperatures, when flying published minimum altitudes significantly above the airport, altimeter errors can exceed 1000 feet, resulting in potentially unsafe terrain clearance if no corrections are made.
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