Which of the following may be used for the repair of fuel leaks on most integral fuel tanks?

The repair of fuel leaks on integral fuel tanks typically employs methods that ensure both strength and fuel integrity. Riveting and resealing is a commonly accepted practice because it provides a robust mechanical fix to secure leaks while allowing for the application of sealants designed to withstand the corrosive environment of aircraft fuel.

Riveting is a reliable method that creates a strong joint, which is essential for maintaining the structural integrity of the tank. After riveting, resealing with compatible sealants helps to prevent fuel from leaking through any gaps or porous areas that may still exist after the mechanical repair. This combination of mechanical fastening and chemical sealing is well-suited for the fuel tank environment, making it the preferred choice for repairs.

Additionally, the other methods mentioned, such as brazing, welding, or using epoxy and sealing tape, may not be as effective or suitable for integral fuel tanks due to the materials involved and the potential for introducing other issues, like changes in tank structure or thermo-chemical interactions that can arise from heat during welding or brazing.