FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Which gas is used for purging an aircraft fuel tank?

  1. Nitrogen

  2. Oxygen

  3. Carbon dioxide

  4. Helium

The correct answer is: Carbon dioxide

Carbon dioxide is used for purging an aircraft fuel tank because it is an inert gas. This means that it does not react with the fuel or other materials in the tank, reducing the risk of fire or explosion during maintenance tasks. Oxygen (Option B) is not used for purging fuel tanks as it supports combustion. Nitrogen (Option A) is also commonly used for purging fuel tanks but carbon dioxide is more frequently used due to its availability. Helium (Option D) is an inert gas as well but is not typically used for purging aircraft fuel tanks.

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