U.S. Department
of Transportation
Federal Aviation
Administration
Advisory
Circular
Date: 12/20/94 AC No. 33-6Subject:
Weld Repair of Aluminum
Crankcases and Cylinders of
Piston Engines
Initiated by:
ANE-110
Change:
1. PURPOSE. This advisory circular provides guidelines for the
development of repair procedures for weld repairs on crankcases
and cylinders of piston engines.
a. It addresses development of weld repairs which are not
contained in the engine manufacturer's "Instructions for
Continued Airworthiness" (Maintenance Manual). It provides
guidance to clarify the areas which should be addressed by an
applicant's repair procedure, and/or substantiating data when
seeking an approval for weld repair on crankcases or cylinders.
b. This advisory circular also includes information on
critical areas of welding, qualifications of welder's, inspection
techniques, the thermal processes, and technical data required.
This advisory circular references industry and military
specifications which are acceptable for use by repair stations as
approved data.
2. RELATED FAR SECTIONS.
a. FAR Part 21, Certification Procedures for Products and
Parts.
b. FAR Part 33, Airworthiness Standards: Aircraft Engines.
c. FAR Part 43, Maintenance, Preventive Maintenance,
Rebuilding, and Alteration; particularly sections 43.9 and 43.13.
(1) Section 43.9 describes the maintenance records
required to approve a part for return to service. These records
shall include "a description (or reference to data acceptable to
the Administrator) of the work performed." This should indicate
what work was performed and the manner in which it was
accomplished. References to documents containing the description
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