Engine records audit: the documents that decide an engine's value

What the audit covers

• Engine identity and status: model, ESN, current TSN/CSN, time and cycles since last shop visit.
• Life-limited parts: the LLP status sheet, back-to-birth traceability for every part, and the cycles remaining to each limit.
• Shop visit history: every shop visit report with the workscope actually performed, parts replaced, and the release.
• Airworthiness directives and service bulletins: the compliance list and the evidence behind each entry.
• Accessories: the accessory list with a release tag (FAA 8130-3 or EASA Form 1) for each unit.
• Performance: the last test cell or MPA run, and the EGT margin trend.
• Inspection history: borescope reports and any open repetitive inspections.
• Configuration: the QEC or EBU inventory and modification status.
• Statements: non-incident statement, preservation records if stored, lease transfer documents.

How it is done

The auditor works from a checklist, builds a gap list, samples entries against source documents and cross-checks the records against the physical engine — data plates, LLP part and serial numbers, accessory serials. The output is a report ranking each gap by its effect on value and airworthiness, with what it takes to close it.

The gaps that cost the most

A break in LLP traceability, because a part without a trace has no life left on paper. Shop visit reports with no workscope. Missing release tags on accessories. An AD compliance list that stops two years ago. Each of these turns into either a price reduction or a delay at redelivery.

Remote or on site

Most of the audit can be done from scanned records; the physical cross-check needs someone at the engine. Records retrieval and imaging — scanning paper archives into a searchable set — is often the first step for older engines.