FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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How many vents must be used in multiengine fuel systems to avoid simultaneous plugging?

Two
Three
Four
One

The correct answer is: Two

Multiengine fuel systems require at least two vents to avoid simultaneous plugging. This is because fuel tanks in these systems are interconnected, so if there is only one vent, an increase in pressure in one tank can cause the other tank to become pressurized as well. This can cause fuel to back up and potentially create a dangerous situation. Having at least two vents allows for proper ventilation and prevents simultaneous plugging. Option B, three vents, is not necessarily incorrect, but it is not required for all multiengine fuel systems and may be excessive. Option C, four vents, would also be excessive and could potentially cause issues with fuel flow. Option D, one vent, is incorrect as it does not allow for proper ventilation and could lead to simultaneous plugging.