Repairs and alterations are classified as either major or minor. 14 CFR part 43, Appendix A, describes the alterations and repairs considered major. Major repairs or alterations shall be approved for return to service on FAA Form 337, Major Repairs and Major Alterations, by an appropriately rated certificate repair station, an FAA certificate A&P mechanic holding an Inspection Authorization, or a representative of the Administrator.
Minor repairs and minor alterations may be approved for return to service with a proper entry in the maintenance records by an FAA certificate A&P mechanic or an appropriately certificate repair station.
For modifications of experimental aircraft, refer to the operating limitations issued to that aircraft.
Modifications in accordance with FAA Order 8130.2, Airworthiness Certification of Aircraft and Related Products, may require the notification of the issuing authority.
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