Aircraft systems and instrumentsQuestion 653 of 934

When should the pilot drain the fuel strainer and take fuel samples?

  1. Only after an oil change
  2. Only after refueling from drums
  3. Before each flight
  4. Once each week
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Correct answer: Before each flight

The pilot should check samples visually for water and contaminants.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Fuel Systems — Fuel Strainers, Sumps, and Drains, page 187

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Questions last reviewed: 18 October 2026