Thursday, October 22, 2026 · Morning warm-up
Capt. Mike's Question of the Day.
Two questions for the Transport Canada pilot written exams every day: a morning warm-up and an evening Captain's Challenge. Each one answered, explained and cited, free. Tap your answer to see how you did.
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An airport is at 4,000 ft elevation. The altimeter setting is 29.92 in. Hg and the OAT is 35°C. What is the approximate density altitude, and what effect will this have on aircraft performance?
The answer
2About 7,300 ft — a longer takeoff roll and a reduced climb rate
Explanation
With the altimeter at 29.92, pressure altitude = 4,000 ft. ISA temperature at 4,000 ft = 15 − (4 × 2) = 7°C. OAT is 35°C, which is 28°C above ISA. TC AIM MET 8.4.3(d) adds 118.8 ft per °C above ISA: density altitude ≈ 4,000 + (118.8 × 28) = 4,000 + 3,326 ≈ 7,300 ft. At this density altitude, engine power output, propeller efficiency, and wing lift are all significantly reduced, causing a much longer takeoff roll and reduced climb rate.
Memory tip: 'Hot, High, Humid = High Density Altitude = Horrible Performance.' Add about 119 ft per °C above ISA to pressure altitude (TC AIM MET 8.4.3(d)).
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