Saturday, October 31, 2026 · Captain's Challenge
The Captain's Challenge.
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At what aerodrome temperature must published minimum IFR altitudes on a Canadian instrument approach be corrected for cold temperature?
The answer
30°C, or 10°C where the MDA or DA is 1,000 ft HAA or higher
Explanation
TC AIM RAC 9.17.1: the published minimum IFR altitudes — MSA/TAA, the initial, intermediate, final and missed approach segments, "including the MDA/DA" — "must be adjusted when the ambient temperature on the surface is much lower than that predicted by the standard atmosphere. As a general rule this is considered to be 0°C or, when MDAs/DAs are 1 000 ft HAA or higher, it begins at 10°C." Corrections come from the Altitude Correction Chart in the CAP, reproduced as RAC Table 9.1, and are added to the published altitude.
Memory tip: Correct from 0°C — and from 10°C when the MDA/DA is 1,000 ft HAA or higher.
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