Daily Rules, Proposed Rules, and Notices of the Federal Government
For legal questions concerning this action, contact Vincent Bennett, Federal Aviation Administration, Office of Regional Counsel, ANE-7, 12 New England Executive Park, Burlington, Massachusetts 01803-5299; telephone (781) 238-7044; fax (781) 238-7055; email
On July 5, 2012, the FAA published a Technical Amendment entitled, “Airworthiness Standards: Aircraft Engine” (77 FR 39623). In that technical amendment, the FAA intended to clarify vibration test requirements in § 33.83 of 14 Code of Federal Regulations Part 33. By letter dated August 3, 2012, the Modification and Replacement Parts Association (MARPA) asserts that the rule appears to be a substantive change that should have been open to public comment. The MARPA further asserts that had the rule been open for comment, it and others would have commented that the technical amendment undermines the existing regulatory system, rather than improving it, and that it imposes unnecessary burdens on the applicant and the government with no commensurate safety benefit. We do not agree with MARPA's assertion that the rule change was substantive. However, in the interest of transparency in the rulemaking process, we are changing the language of § 33.83(a) amendment 33-33 back to the language in § 33.83(a) of the previous amendment 33-17.
Aircraft, Aviation safety.
In consideration of the following, the Federal Aviation Administration corrects part 33 of Title 14, Code of Federal Regulations as follows:
49 U.S.C. 106(g), 40113, 44701-44702, 44704.
(a) Each engine must undergo vibration surveys to establish that the vibration characteristics of those components that may be subject to mechanically or aerodynamically induced vibratory excitations are acceptable throughout the declared flight envelope. The engine surveys shall be based upon an appropriate combination of experience, analysis, and component test and shall address, as a minimum, blades, vanes, rotor discs, spacers, and rotor shafts.