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Federal Register / Vol. 86, No. 107 / Monday, June 7, 2021 / Proposed Rules information. The street address for Docket Operations is listed above.
Comments will be available in the AD
docket shortly after receipt.
FOR FURTHER INFORMATION CONTACT: Rao Edupuganti, Aerospace Engineer, Dynamic Systems Section, Technical Innovation Policy Branch, Policy &
Innovation Division, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225110; email rao.edupuganti@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210450; Project Identifier 2017SW100AD at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend this proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this proposal.

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Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Rao Edupuganti, Aerospace Engineer, Dynamic Systems Section, Technical Innovation Policy Branch, Policy & Innovation Division, FAA, 10101 Hillwood Pkwy., Fort
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Worth, TX 76177; telephone 817 222
5110; email rao.edupuganti@faa.gov.
Any commentary that the FAA receives that is not specifically designated as CBI
will be placed in the public docket for this rulemaking.
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20170037, dated February 22, 2017 EASA AD
20170037, to correct an unsafe condition for Airbus Helicopters Deutschland GmbH formerly Eurocopter Deutschland GmbH, Airbus Helicopters Inc. formerly American Eurocopter LLC Model MBBBK 117
D2 and MBBBK117 D2m helicopters.
This proposed AD was prompted by the discovery that certain parts that are approved for installation on multiple helicopter models are life limited parts when installed on Model MBBBK 117
D2 helicopters and some helicopter delivery documents excluded the life limit information. The FAA is proposing this AD to address an unsafe condition on these products. See EASA AD 2017
0037 for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20170037 requires establishing a life limit for rotor mast nut part number P/N D632K1133201
and helical gear support P/N
D632K1113201, and replacing these parts before exceeding their life limit.
EASA AD 20170037 also requires replacing each rotor mast nut P/N
D632K1133201 for which the hours time-in-service TIS are unknown and replacing certain part-numbered rotor mast nuts before accumulating 3,708
hours TIS since first installation on a helicopter. EASA AD 20170037
requires re-identifying each rotor mast nut P/N 1171213301 to P/N
D632K1133201 by following the specified service information. EASA AD
20170037 requires replacing any MGB
P/N D632K1001051 with serial number S/N D20001 up to D20108 inclusive, D20123, D20126, D20127, or D2
0130 up to D20136 inclusive with a not affected MGB before the affected MGB
accumulates 3,708 hours TIS. EASA AD
20170037 also prohibits installing an affected rotor mast nut or an affected MGB that has accumulated more than 3,708 hours TIS since first installation on a helicopter. Additionally, EASA AD
20170037 requires revising the Aircraft Maintenance Program AMP.
This material is reasonably available because the interested parties have access to it through their normal course
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of business or by the means identified in the ADDRESSES section.
Other Related Service Information The FAA reviewed Airbus Helicopters Alert Service Bulletin MBBBK117
D263A001, Revision 0, dated December 1, 2016 ASB 63A001, which is not incorporated by reference, which specifies procedures for reidentifying the rotor mast nut by using a vibrograph, crossing out the old P/N
and marking the new P/N on the outer surface, engraving the letter A behind the S/N of each part, and updating the historical record and log card to confirm compliance with ASB 63A001. ASB
63A001 also specifies during the next MGB overhaul, making an entry in the log card to confirm re-identification of the helical gear support, and annotating the S/N of the helical gear support.
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 EASA AD 20170037. 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.
Proposed AD Requirements This proposed AD would require accomplishing the actions specified in EASA AD 20170037, described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this proposed 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
20170037 will be incorporated by reference in the FAA final rule. This proposed AD would, therefore, require compliance with EASA AD 20170037

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