Aviation Glossary - Integral Fuel Tank

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Integral Fuel Tank

A portion of the aircraft structure, usually a wing, which is sealed off and used as a fuel tank. When a wing is used as an integral fuel tank, it is called a “wet wing.”

source: FAA Airplane Flying Handbook (FAA-H-8083-3A)

A fuel tank which is formed by sealing off part of the aircraft structure and using it as a fuel tank. An integral wing tank is called a “wet wing.” Integral tanks are used because of their large weight saving. The only way of repairing an integral fuel tank is by replacing damaged sealant and making riveted repairs, as is done with any other part of the aircraft structure.

source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31)

An aircraft fuel tank made by sealing off part of the structure so fuel can be carried in the structure itself.

source: FAA Aviation Maintenance Technician Powerplant Handbook (FAA-H-8083-32)

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