Part145

Part 145 refers to the FAA regulation governing certification and operation of aviation maintenance organizations in the United States. It covers repair stations that perform maintenance, preventive maintenance, inspections, repairs, and alterations on civil aircraft, engines, propellers, and related components. A Part 145 repair station is authorized to return items to service after work, within the scope of its approved certificate and procedures.

Certification and scope are defined in the 14 CFR Part 145 rule. To obtain and maintain a Part 145 certificate, an organization must demonstrate adequate facilities, equipment, tooling, and a quality control system. The certificate specifies the scope of work the station is allowed to perform and the data and methods it may use. The organization must also designate an accountable manager, a maintenance supervisor, and qualified personnel who hold appropriate ratings and training.

Requirements and operations emphasize control and compliance. Part 145 repair stations must maintain an FAA-approved quality control system, written procedures, and a continuing training program. Work processes rely on approved data and methods, with documentation and traceability throughout all tasks. Personnel involved in maintenance and release to service must be properly certified and authorized, and there must be a responsible signatory who verifies the work.

Records and airworthiness: The station must generate and retain maintenance records, including work orders, inspections, and releases to service. The certificate is subject to FAA surveillance, periodic audits, and potential amendments or revocation. The Part 145 framework supports safe, verifiable maintenance practices and the proper return to service of aviation assets.

Global context: Many regions maintain similar maintenance organization regulations, such as EASA Part 145 in the European Union, with differences in scope and oversight. Part 145 remains a core element of aviation maintenance governance in the United States.