Aircraft systems and instrumentsQuestion 626 of 934

What is a wet-sump oil system?

  1. The oil is in a sump that is part of the engine
  2. The oil is in a separate tank away from the engine
  3. The oil pump is driven by an electric motor
  4. The oil system has no sump and no oil pump
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Correct answer: The oil is in a sump that is part of the engine

In a dry-sump system, the oil is in a separate tank.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Oil Systems, page 176

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Questions last reviewed: 18 October 2026