Which documentation is typically required to close an overhaul work order?

• A. Work order, component histories, NDT reports, measurement records, test data, and sign-offs from authorized personnel.
• B. Only the work order.
• C. Customer approval.
• D. Photos of the engine.

Answer: (A)

The key idea is that closing an overhaul work order requires a complete, traceable documentation package that proves every required step was carried out correctly and that the engine meets airworthiness standards. This means the work order itself as the master record, plus component histories to show the life and previous actions on each part, NDT reports to confirm structural integrity, measurement records to prove parts and clearances stay within specified limits, test data to verify functional performance, and sign-offs from authorized personnel who performed or supervised the work. Collectively, these elements provide auditable evidence that the overhaul meets the agreed scope and quality requirements and is safe for service.

Relying only on the work order omits essential verification like inspection results, measurements, and functional testing. Customer approval may be part of the process in some contexts, but it does not substitute for the technical validation and regulatory release. Photos of the engine show appearance but not the substantive technical evidence needed to close the work order.