Thursday, November 5, 2026 · Morning warm-up
Capt. Mike's Question of the Day.
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A pilot is 60 NM into a flight when weather forces a diversion to an alternate 45 NM away. Current groundspeed is 120 knots and fuel flow is 35 L/hr. How much fuel is required to reach the alternate (excluding reserve)?
The answer
213.1 L
Explanation
Time to the alternate = 45 NM ÷ 120 kt = 0.375 h (22.5 min), and fuel = 35 L/h × 0.375 h = 13.1 L. The 60 NM already flown has no bearing on the fuel needed from the diversion point. The reserve — 30 minutes at normal cruising speed for an aeroplane by day under CARs 602.88(3)(a)(i) — is added on top of this figure.
Memory tip: Fuel = Flow × Time. Time = Distance / GS. Always calculate in hours: 45/120 = 0.375 hrs. Then 35 × 0.375 = 13.1 L.
Source
TP 12880E Navigation — Navigation Computers: 5 Fuel consumption and conversions
Taught in: PPL › NavigationThis question is from the PPL course, which teaches every PPAER subject and drills it like this. Unlock all 7 chapters with their quizzes (105 questions), and 4 full-length PPAER mock exams.
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