FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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How can internal leakage of a fuel valve be checked without removing it?

  1. By listening for leaks

  2. By using a pressure gauge

  3. Place the valve in the OFF position and monitor the strainer bowl

  4. Inspect visually for leaks

The correct answer is: Place the valve in the OFF position and monitor the strainer bowl

Placing the valve in the OFF position and monitoring the strainer bowl allows you to check for internal leakage without removing the fuel valve because it will not allow any fuel to flow through the valve. This method is more accurate than listening for leaks, which may be difficult to detect. Using a pressure gauge may also not accurately detect internal leakage, as it may only measure external leakage. Inspecting visually for leaks may not always be effective as the internal leakage may not be visible. Therefore, placing the valve in the OFF position and monitoring the strainer bowl is the best method to check for internal leakage without removing the valve.