In this assembly, what tools are used to drive the lockbolts?

In aerospace assembly, lockbolts are a type of fastener that provides a high degree of strength and reliability. The correct option, which includes a rivet gun, bell die, and lockbolt puller, encompasses the essential tools used for this fastening process.

The rivet gun is crucial as it delivers the force necessary to drive the lockbolt's pin into place securely. The bell die, which is a special tool attached to the rivet gun, creates a uniform and precise deformation of the lockbolt's head. This is important for ensuring a strong connection and maintaining the structural integrity of the materials being joined.

The lockbolt puller is also vital because it is specifically designed to pull and set the lockbolt into its final position. It guarantees that the fastener is properly tensioned and secured, preventing any potential loosening during operation.

By utilizing all three tools, the assembly process achieves the necessary precision and reliability for safety-critical applications in aerospace contexts. The other options do not include the complete set of tools required or involve tools that are not suited for lockbolt installation.