11.5 Documentation, Maintenance Records, and Data Discipline

Paperwork Is Part of the Maintenance Action

Documentation is not clerical cleanup performed after the 'real' maintenance — it is part of the maintenance action and part of the aircraft's airworthiness. The record tells the next mechanic, inspector, owner, or pilot what was done, what data supported it, and who took responsibility for approving it. An aircraft can be physically repaired and still not be legally airworthy if the required record entry is missing or incomplete.

Two regulations dominate records questions, and the DME expects you to know the split:

• 14 CFR 43.9 — content, form, and disposition of records for maintenance, preventive maintenance, rebuilding, and alteration (the everyday repair and alteration entries).
• 14 CFR 43.11 — content, form, and disposition of records for inspections conducted under Part 91 and others, including the annual and 100-hour inspections.

A quick way to remember it: 43.9 is for work performed, 43.11 is for inspections completed. Both end in a record entry, but the required elements differ, and an inspection entry must additionally state the type and extent of the inspection and the aircraft total time in service.

Documentation also has a permanence dimension the DME may probe. Routine maintenance and 100-hour/annual inspection records are retained until the work is superseded or for one year, while certain records — total time in service, current inspection status, status of life-limited parts, and AD compliance — must be retained and transferred with the aircraft because they establish ongoing airworthiness.

A mechanic who treats the logbook as disposable scratch paper misunderstands that these entries follow the aircraft for its entire life and are relied on by every future owner and inspector. Advisory Circular AC 43-9 provides FAA guidance on acceptable maintenance record-making practices and is the document to cite when a DME asks how records should be written.

What a Compliant Entry Must Contain

Under 43.9, a maintenance entry approving an item for return to service must contain, at minimum:

1. A description of the work performed (or a reference to data acceptable to the Administrator, such as a work order on file).
2. The date the work was completed.
3. The name of the person who performed the work, if different from the person approving it.
4. The signature, certificate number, and kind of certificate held by the person approving the aircraft, airframe, engine, propeller, appliance, or component part for return to service.

That fourth element is where mechanics most often fall short. Signing your name is not enough — the entry must show your certificate number and that you hold a mechanic certificate with the appropriate rating.

For inspections under 43.11, the entry adds the type of inspection and a brief description of its extent, the date and aircraft total time in service, and a specific return-to-service statement. If the inspection found discrepancies that make the aircraft unairworthy, the person must instead make a disapproval entry and provide the owner a signed list of those discrepancies.

Performing vs. Approving, and the Data Behind It

The DME frequently probes the distinction between performing maintenance and approving an aircraft or appliance for return to service, because they carry different responsibility. A mechanic might perform a task under supervision yet not personally hold the privilege to approve the result; the record must reflect who did each. This is also where the Part 65 privileges in 11.6 connect — only an appropriately rated and current mechanic may sign the return-to-service approval.

Every entry should be traceable to approved or acceptable maintenance data: the manufacturer's Instructions for Continued Airworthiness (ICA) / maintenance manual, applicable Airworthiness Directives (ADs), Type Certificate Data Sheets, and acceptable methods such as AC 43.13-1B/2B when no manufacturer data exists. AD compliance in particular must be recorded — the AD number, method of compliance, date, and recurring interval if applicable — because an uncomplied AD renders the aircraft unairworthy regardless of physical condition.

When a candidate is unsure what the required entry or approval is, the correct move is the same one that governs the whole certificate: consult the applicable regulation and the maintenance data before signing. A defensible records answer in the oral names the regulation (43.9 or 43.11), lists the required elements, identifies the supporting data, and states who holds the approval authority — exactly the structure that proves you understand records as airworthiness, not bureaucracy.

Major work raises the bar further. A major repair or major alteration (defined in Part 43, Appendix A) cannot be cleared by an ordinary logbook entry alone; it requires FAA Form 337, Major Repair and Alteration, and the approving signature of an appropriately authorized person — commonly a mechanic holding an Inspection Authorization (IA), or work performed and approved by a certificated repair station under its own data. 9) from a major one (Form 337 plus the right authority).

Misclassifying a major alteration as minor and signing it off with a simple entry is both a paperwork failure and an airworthiness failure, because the work was never approved on the data the FAA requires.