AC 43.13-2C

Acceptable Methods, Techniques, and Practices – Aircraft Alterations

Revised Jul 29, 2026

Revision

C

Issued

Jul 29, 2026

Office

AFS-300

Supersedes

43.13-2B

Current 43.13-2C dated 2026-07-29, superseding 43.13-2B.

This AC contains methods, techniques, and practices acceptable to the Administrator for the inspection and alteration on nonpressurized areas of civil aircraft of 12,500 pounds gross weight or less. This data generally pertains to minor alterations. However, the alteration data herein may be used as approved data for major alterations when the AC chapter, page, and paragraph are listed in block 8 of Federal Aviation Administration (FAA) Form 337, Major Repair and Alteration (Airframe, Powerplant, Propeller, or Appliance), when the user has determined that it is appropriate to the product being altered, directly applicable to the alteration being made, and not contrary to the manufacturer’s…

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