Where to look for altitude corrections based on temperature?

• A. ICAO Cold Temperature Error Table
• B. FAA Temperature Corrections Chart
• C. ISA Correction Table
• D. NWS Cold Temperature Corrections

Answer: (A)

Temperature affects how far off your altimeter can be from your true altitude. When air is colder than standard (ISA), the true altitude tends to be lower than what the altimeter indicates. To stay safe and maintain required terrain or obstacle clearance, you apply cold-temperature corrections to your indicated altitude. The ICAO Cold Temperature Error Table is the official, internationally recognized reference for calculating these corrections. It provides the amount to add (or adjust) to your indicated altitude based on the altitude and the temperature deviation from ISA, so you can determine the true altitude you’ll actually be at. The other options aren’t the standard source used for these corrections in aviation practice; they either don’t provide a universally adopted correction method or are not the instrument-altitude correction reference used in flight planning and operations.