FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Question: 1 / 1030

What is the recommended practice for cleaning a fuel tank before welding?

Use a chemical solvent

Steam clean the tank interior

Steam cleaning is the recommended practice for cleaning a fuel tank before welding because it effectively removes all debris and flammable materials without the use of chemicals, which can cause harmful fumes. Chemical solvents (option A) can also leave residue and contaminate the tank. Rinsing with water (option C) may also leave water behind which can mix with residual fuel and cause a fire hazard. Blowing air inside the tank (option D) can stir up debris and create sparks, making it a safety hazard. Therefore, steam cleaning the tank interior is the safest and most efficient option for cleaning a fuel tank before welding.

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Rinse with water

Blow air inside the tank

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