SUBJECT: FABRICATION OF AIRCRAFT
PARTS BY MAINTENANCE PERSONNEL
Date: 3/24/06
Initiated By: AFS-307
AC No: 43-18
Change:
1. PURPOSE.
a. The purpose of this advisory circular (AC) is to ensure that parts fabricated during
maintenance and alteration have an equivalent level of safety to those parts produced under the
original design holder’s production certificate. This AC provides one means of complying with
the requirements of Title 14 of the Code of Federal Regulations (14 CFR) part 21 and part 43 for
the design and fabrication of parts by persons performing maintenance and alterations using
methods, techniques, and practices acceptable to the Administrator. As required by regulation,
such parts fabrication and their implementation must be accomplished “in such a manner… that
the condition of the aircraft, airframe, aircraft engine, propeller, or appliance worked on will be
at least equal to its original or properly altered condition.”
b. This AC is not mandatory and does not constitute a regulation. It is issued for guidance
and to outline one method of compliance with the rules. In lieu of following without deviation
the method prescribed herein, a person may elect to follow an alternative method, provided the
Federal Aviation Administration (FAA) finds the alternative method to be an acceptable means
of complying with the applicable requirements of 14 CFR.
2. REGULATIONS AND GUIDANCE MATERIAL.
a. Regulations. Refer to the following regulations in 14 CFR generally applicable to
satisfying or making a finding of compliance.
(1) Part 1, Definitions and Abbreviations.
(2) Part 21, Certification Procedures for Products and Parts.
(3) Part 23, Airworthiness Standards: Normal, Utility, Acrobatic, and Commuter
Category Airplanes.
(4) Part 25, Airworthiness Standards: Transport Category Airplanes.
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