# 14 CFR Part 43: Maintenance, preventive maintenance, rebuilding, and alteration

> Who may perform and approve maintenance, and what the records must say.

Source: https://www.aerscheduler.com/regulations/part-43
Full text of Part 43: https://www.ecfr.gov/current/title-14/part-43

- [14 CFR 43.3: Who may perform maintenance](https://www.aerscheduler.com/regulations/43-3.md): Maintenance may be done by certificated mechanics and repairmen, repair stations, air carriers and manufacturers, and by people working under a mechanic's direct supervision. A pilot may do preventive maintenance on an aircraft they own or operate, as long as it is not used under Parts 121, 129 or 135.
- [14 CFR 43.7: Who may approve a return to service](https://www.aerscheduler.com/regulations/43-7.md): Only certain people may sign an aircraft back into service after maintenance: mechanics and Inspection Authorization holders within Part 65, repair stations, manufacturers for their own work, air carriers, and a private pilot or higher after preventive maintenance they did themselves.
- [14 CFR 43.9: What a maintenance logbook entry must say](https://www.aerscheduler.com/regulations/43-9.md): Whoever does maintenance, preventive maintenance or an alteration makes a logbook entry with a description of the work, the date it was completed, the name of who did it, and the signature, certificate number and kind of certificate of whoever approved it. Major repairs and alterations also need a Form 337.
- [14 CFR 43.11: What an inspection logbook entry must say](https://www.aerscheduler.com/regulations/43-11.md): After an annual, 100-hour or other required inspection, the inspector logs the type and extent of the inspection, the date and total time, their signature and certificate, and a statement that the aircraft is airworthy or that a list of discrepancies was given to the owner.
- [14 CFR Part 43, Appendix A: Major repairs, major alterations and preventive maintenance](https://www.aerscheduler.com/regulations/43-appendix-a.md): Appendix A defines three lists: major alterations, major repairs, and preventive maintenance. The preventive maintenance list in paragraph (c) is the work a pilot may do on an aircraft they own or operate, such as tire changes, spark plugs, oil and fuel filters, batteries and simple fabric patches.
- [14 CFR Part 43, Appendix D: What an annual and 100-hour inspection must cover](https://www.aerscheduler.com/regulations/43-appendix-d.md): Appendix D lists the minimum an annual or 100-hour inspection must cover. The inspector opens and cleans the aircraft, then checks each group, from fuselage, cabin, engine and landing gear to wings, tail, propeller and radios, for the defects the appendix names.