What should be documented clearly in the repair process according to quality control standards?

Documenting all modifications and repairs made to the aircraft structure is critical for ensuring compliance with regulatory standards and maintaining the integrity of the aircraft's airworthiness. This documentation serves several purposes: it provides a clear record of the work performed and helps trace any issues that may arise in the future back to specific repairs or modifications.

In the context of quality control, such records are crucial as they provide validation that the repairs meet the necessary safety and operational standards. This documentation is also vital for inspections and audits, as it demonstrates adherence to proper procedures and facilitates transparency in maintenance practices. Overall, having a comprehensive log of all modifications and repairs is essential for ongoing aircraft safety and reliability, and is a cornerstone of effective quality control in aircraft maintenance.