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Aircraft systems and instrumentsQuestion 630 of 934

When is the air cooling system of a piston engine least effective?

  1. During takeoffs and ground operations
  2. During high-speed descents at low power
  3. During cruise at low power and high speed
  4. During long glides with the engine idling
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Correct answer: During takeoffs and ground operations

The cooling system is less effective in periods of high-power, low-airspeed operation.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Engine Cooling Systems, page 177

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026