aircraft systemsFAA-published sample question (FIA, Aug 2021)
During preflight, the fuel vent system should always be checked
A
to ensure the vent is closed.
B
to ensure the vent is open.✓ Correct Answer
C
to ensure the vent system pressure is in the green range.
Explanation
Fuel tanks are vented so air can replace fuel as it is used; a blocked vent can create a vacuum that stops fuel flow. The preflight check is therefore to make sure the vent is open and unobstructed. Vents are not closed, and they have no pressure gauge.
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