Preventive Maintenance (Owner/Operator)

Preventive maintenance is a defined, limited category of aircraft maintenance that a certificated pilot may legally perform on an aircraft they own or operate, without holding a mechanic certificate. It is not a loose concept of "small jobs" — it is a specific list. The list lives in 14 CFR Part 43 Appendix A, paragraph (c), and the authority to do it comes from 14 CFR 43.3(g): the holder of a pilot certificate issued under Part 61 may perform preventive maintenance on any aircraft owned or operated by that pilot, provided the aircraft is not used under Part 121, 129, or 135. Two conditions therefore have to be met at once — the person must hold at least a pilot certificate, and must own or operate the aircraft — and the aircraft must be outside scheduled and on-demand air-carrier operations.

Appendix A(c) enumerates roughly three dozen tasks. Familiar examples include: removing, installing, and repairing landing-gear tires; replacing elastic shock absorber cords; servicing landing-gear shock struts by adding oil, air, or both; lubricating items not requiring disassembly other than removal of non-structural covers; replenishing hydraulic fluid; changing engine oil and cleaning or replacing oil filters or screens; cleaning, gapping, or replacing spark plugs; replacing and servicing batteries; replacing safety belts; replacing bulbs, reflectors, and lenses of position and landing lights; replacing side windows where the work does not interfere with structure or controls; replacing seats or seat parts with approved replacement parts; making small simple repairs to fairings and non-structural cover plates; replacing prefabricated fuel lines and hoses; replacing safety wiring; and applying preservative or protective material. The defining characteristic is that these are simple or minor operations, involving small standard parts and no complex assembly, that a diligent owner can perform without special training. If a task is not on the Appendix A(c) list, it is not preventive maintenance — it is maintenance, and it requires an appropriately rated mechanic.

Doing the work is only half of the requirement. Every preventive-maintenance task must be documented with a maintenance record entry under 14 CFR 43.9. The entry must describe the work performed, give the date it was completed, and include the signature, certificate number, and kind of certificate held by the person doing the work. When a pilot-owner performs and signs off preventive maintenance, that signature approves the aircraft for return to service — the pilot is both the person doing the work and the person releasing it. (Because owners cannot approve work done by others, the record does not carry the separate return-to-service statement that a mechanic's entry would; the pilot's signature on the description is the approval.) An undocumented oil change is not a completed task; it is an open discrepancy waiting to be found in the logbook.

The limits deserve emphasis because they are where owners get into trouble. Preventive maintenance authority does not extend to aircraft operated under Part 121, 129, or 135 — the moment an aircraft enters air-carrier service, this owner privilege disappears and the work must be done under the operator's approved maintenance program. It does not turn a pilot into a mechanic for anything beyond the Appendix A(c) list. And it does not relax the parts and data requirements: replacement parts must be approved, and the work must meet the performance rules of 14 CFR 43.13. EASA has an analogous but distinctly structured concept. Under Part-ML, a Pilot-owner may carry out limited "pilot-owner maintenance" on certain non-commercial, lighter aircraft, with the tasks and conditions specified in the Part-ML rules rather than in a Part 43 appendix. The idea — empowering a qualified owner to do simple upkeep and log it — is shared across both systems, but the eligible aircraft, the task lists, and the recording rules differ, and an operator cannot assume the FAA list and the EASA list are interchangeable.

For a flight school or a leaseback owner, preventive maintenance sits on a fault line: it can save real money and turnaround time, or it can quietly create a compliance problem, depending on how carefully the two conditions are respected. The most common trap is the aircraft's operational status. A pilot-owner may perform Appendix A(c) tasks on a personal aircraft used for Part 91 flying — but a training aircraft operated for hire, and certainly one flown under Part 135, changes the picture. Aircraft in air-carrier operations under Part 121, 129, or 135 are outside the owner privilege entirely, and even for-hire Part 91 training operations should be run with clear internal rules about who is authorized to touch which aircraft, so that a well-meaning oil change does not become an unauthorized maintenance entry.

The second trap is the paperwork. Because preventive maintenance feels informal — it is, after all, the kind of task an owner does in their own hangar — the 14 CFR 43.9 record entry is the step most often skipped. But an undocumented task is indistinguishable, on audit, from a task never performed, and a logbook with gaps where routine servicing should be recorded undermines confidence in the whole record. For leaseback fleets in particular, where an investor-owner may perform preventive maintenance on their own aircraft while the school operates it, the entries need to flow into the same maintenance record the school relies on for dispatch decisions — otherwise the operator is flying an aircraft whose recent maintenance history they cannot fully see.

Aviatize's Maintenance Execution module gives preventive-maintenance tasks the same structured record as any other maintenance event: the person performing an Appendix A(c) task records the work description, the date, and their certificate number and kind of certificate, satisfying 14 CFR 43.9 and creating a durable, searchable entry rather than a handwritten note that may never make it into the book. That keeps owner-performed servicing — oil changes, tire and spark-plug replacements, battery service — inside the aircraft's official maintenance history.

Aviatize's Maintenance Control module keeps that history visible to the people making dispatch decisions, so a school operating a leaseback aircraft can see the owner's recent preventive-maintenance entries alongside the inspection status before releasing the aircraft for a flight. The Compliance & Auditing module makes the same records available on demand for FSDO surveillance or a pre-purchase review, so routine owner maintenance is an asset in the audit trail rather than a set of gaps someone has to explain.