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

The repair of fuel leaks on most integral fuel tanks typically involves methods that effectively restore the integrity of the tank without compromising its safety and performance. Riveting and resealing is an appropriate method because it allows for the secure attachment of patches or additional material to the tank structure. Resealing is crucial in ensuring that the seams and joints do not allow fuel to escape.

When integral fuel tanks, which are often built into the structure of the aircraft, develop leaks, it's essential to utilize repair techniques that maintain the strength and functionality of the tank. Riveting provides a mechanical fastening solution that can hold patch materials in place securely, while resealing involves applying materials designed specifically for fuel resistance, preventing further leaks.

Both epoxy and sealant could be effective for small leaks but may not provide the structural reinforcement that riveting does. Similarly, techniques such as welding or soldering may not be safe for repairs on materials that could be affected by the heat during such processes, especially in aircraft tanks where integrity is vital. Heat shrinking and patching might also not be suitable for the high-stress environments that integral fuel tanks experience. Therefore, riveting and resealing emerges as a reliable method for ensuring effective and safe repairs on integral fuel tanks.