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Federal Register / Vol. 86, No. 138 / Thursday, July 22, 2021 / Proposed Rules The FAA must receive comments on this proposed AD by September 7, 2021.

DATES:

You may send comments by any of the following methods:
Federal eRulemaking Docket: Go to https www.regulations.gov. Follow the online instructions for sending your comments electronically.
Fax: 202 4932251.
Mail: Send comments to the U.S.
Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200
New Jersey Avenue SE, Washington, DC
205900001.
Hand Delivery: Deliver to the Mail address between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this proposed rule, contact Airbus Helicopters, 2701 North Forum Drive, Grand Prairie, TX 75052; telephone 972 6410000 or 800 2320323; fax 972 6413775; or at https
www.airbus.com/helicopters/services/
technical-support.html. You may view the referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX
76177.

ADDRESSES:

Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0197; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
The AD docket contains this NPRM, the European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD, any comments received, and other information. The street address for Docket Operations is listed above.
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:
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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.
FAA20210197; Project Identifier 2018SW107AD at the beginning of your comments. The most helpful
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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 NPRM.
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 Worth, TX 76177; telephone 817 222
5110; email rao.edupuganti@faa.gov.
Any commentary that the FAA receives which 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 20180263, dated December 7, 2018 EASA AD
20180263, to correct an unsafe condition for Airbus Helicopters Model EC 155 B and EC 155 B1 helicopters.
EASA advises that after an accident on a Model EC225 helicopter, an investigation revealed the failure of an MGB second stage planet gear. EASA
states that one of the two types of planet gear used in the MGB epicyclic module is subject to higher outer race contact pressures and therefore is more susceptible to spalling and cracking.

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EASA AD 20180263 consequently requires repetitive inspections of the MGB magnetic plugs, the MGB filer, and the oil sump for particles, and depending on the results of those inspections, removing or replacing certain parts. EASA AD 20180263 also requires reducing the life limit of Type Z planet gear assemblies. EASA AD
20180263 also requires, if certain gear assemblies are installed, either replacing the MGB or replacing the epicyclic reduction gear. Finally EASA AD 2018
0263 prohibits installing a Type Y
planet gear assembly or an MGB with a Type Y planet gear assembly on any helicopter.
FAAs Determination These helicopters have been approved by EASA and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the European Union, EASA has notified the FAA of the unsafe condition described in its AD. The FAA is proposing this AD
after evaluating all known relevant information and determining that an unsafe condition is likely to exist or develop on other products of the same type designs.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Airbus Helicopters Alert Service Bulletin ASB No. EC155
05A034, Revision 5, dated December 4, 2018 ASB EC15505A34 Rev 5 for Model EC 155 helicopters, which specifies periodic inspections of the MGB magnetic plugs, the MGB filter, and the oil sump for particles. ASB
EC15505A34 Rev 5 also specifies identifying the type of gear assembly installed in the MGB and replacing any Type Y planet gear assembly within 50
hours time-in-service TIS. For Type Z
gear assemblies that have logged less than 1,800 hours TIS since new, this service information specifies replacing the gear assembly before exceeding 1,800 total hours TIS, and for Type Z
gear assemblies that have logged 1,800
or more total hours TIS, replacing the gear assembly within 600 hours TIS.
The FAA also reviewed Airbus Helicopters Service Bulletin SB No.
EC15563016, Revision 4, dated July 26, 2018, for Model EC 155 helicopters.
This service information specifies procedures for replacing the MGB
epicyclic reduction gear without removing the MGB.
This service information 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.

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