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Federal Register / Vol. 86, No. 37 / Friday, February 26, 2021 / Proposed Rules
of the European Union, has issued EASA AD No. 20200171, dated July 28, 2020 EASA AD 20200171, to correct an unsafe condition for all Airbus Helicopters, Eurocopter, Eurocopter France, Aerospatiale, Sud Aviation Model SA 330 J helicopters.
This proposed AD was prompted by the newly developed MGB fan rotor shaft bearing design. The FAA is proposing this AD to prevent rotor burst of the MGB fan, damage to the hydraulic lines and flight controls, and subsequent loss of control of the helicopter. See the EASA AD for additional background information.
Further, since the FAA issued AD
20101651, Eurocopter France changed its name to Airbus Helicopters. This proposed AD reflects that change.

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Related Service Information Under 1
CFR Part 51
For MGB fan rotor shaft bearings both rear and front part number P/N
704A33651114 manufacturer P/N MP/
N 205FFTX74K6G33 and MGB fan rotor shaft bearings both rear and front P/N 704A33651268 MP/N 594918, EASA AD 20200171 describes procedures for inspecting for play a gap between the MGB fan rotor blade and the upper section of the guide vane bearing housing. If there is play that does not meet the minimum requirement, the EASA AD requires replacing the affected MGB fan rotor shaft bearings with MGB fan rotor shaft bearings both rear and front P/N
704A33651268 MP/N 594918.
This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
FAAs Determination and Requirements of This Proposed AD
These products have been approved by the aviation authority of another country, and are approved for operation in the United States. Pursuant to the bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the EASA AD referenced above. The FAA is proposing this AD
after evaluating all the relevant information and determining the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Explanation of Retained Requirements Although this proposed AD does not explicitly restate the requirements of AD
20101651, this proposed AD would retain a certain requirement of AD
20101651. This requirement is
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referenced in EASA AD 20200171, which, in turn, is referenced in paragraph g of this proposed AD.
Proposed AD Requirements This proposed AD would require accomplishing the actions specified in EASA AD 20200171 described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this AD and except as discussed under Differences Between this Proposed AD and the EASA AD.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA AD
20200171 will be incorporated by reference in the FAA final rule. This proposed AD would, therefore, require compliance with EASA AD 20200171
in its entirety, through that incorporation, except for any differences identified as exceptions in the regulatory text of this proposed AD.
Using common terms that are the same as the heading of a particular section in the EASA AD does not mean that operators need comply only with that section. For example, where the AD
requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in the EASA AD. Service information specified in EASA AD
20200171 that is required for compliance with EASA AD 20200171
will be available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210092 after the FAA final rule is published.
Differences Between This Proposed AD
and the EASA AD
The EASA AD applies to all Model SA 330 J helicopters, whereas this proposed AD applies to certain Model SA330J helicopters instead. The EASA
AD refers to flight hours, whereas this proposed AD uses hours time-in-service.
The EASA AD requires inspecting for play, whereas this proposed AD requires inspecting for a gap instead. The EASA
AD requires returning certain parts, whereas this proposed AD requires
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removing the parts from service instead.
The EASA AD requires completing a response form, whereas this proposed AD does not.
Interim Action The FAA considers this proposed AD
interim action. If final action is later identified, the FAA might consider further rulemaking then.
Costs of Compliance The FAA estimates that this AD
affects 15 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates that operators may incur the following costs in order to comply with this proposed AD.
Inspecting for a gap between the MGB
fan rotor blade and the upper section of the guide vane bearing housing would take about 2 work-hours for an estimated cost of $170 per helicopter and $2,550 for the U.S. fleet, per inspection cycle.
Replacing a set of two bearings would take about 6 work-hours and parts would cost up to about $1,665 for an estimated cost of up to $2,175 per helicopter.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government.

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