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Proposed Rules
Federal Register Vol. 86, No. 179
Monday, September 20, 2021

This section of the FEDERAL REGISTER
contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210793; Project Identifier MCAI202100372E
RIN 2120AA64

Airworthiness Directives; Safran Helicopter Engines, S.A. Type Certificate Previously Held by Turbomeca S.A. Turboshaft Engines Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to supersede Airworthiness Directive AD
20051208, which applies to Safran Helicopter Engines, S.A. Safran Helicopter Engines Arrius 2B1, 2B1A, 2B1A1, and 2B2 model turboshaft engines. AD 20051208 requires replacing the software in the engine electronic control unit EECU. Since the FAA issued AD 20051208, the manufacturer determined that certain previously affected EECUs are not subject to the unsafe condition identified in AD 20051208. This proposed AD would retain the requirements of AD 20051208 for engines with a certain EECU part number P/N installed. This proposed AD would also prohibit installation of an affected EECU onto any engine. The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by November 4, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M
SUMMARY:

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30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Safran Helicopter Engines, S.A., Avenue du 1er Mai, 40220 Tarnos, France; phone: +33 0 5
59 74 45 00. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call 781 2387759.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210793; 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 mandatory continuing airworthiness information MCAI, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Wego Wang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
781 2387134; fax: 781 2387199;
email: wego.wang@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposed AD.
Send your comments to an address listed under ADDRESSES. Include Docket No. FAA20210793; Project Identifier MCAI202100372E 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 the 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

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www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact we receive about this proposed AD.
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 Wego Wang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA
01803. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA issued AD 20051208, Amendment 3914124 70 FR 34334, June 14, 2005, AD 20051208, for all Turbomeca S.A. Turbomeca Arrius 2B1, 2B1A, 2B1A1, and 2B2 model turboshaft engines. AD 20051208 was prompted by a report of simultaneous loss of automatic control of both engines of an Airbus Helicopters Deutschland formerly Eurocopter Deutschland EC135 helicopter during flight. AD
20051208 requires replacing the software in the EECU. The agency issued AD 20051208 to prevent simultaneous loss of automatic control of both engines and subsequent loss of control of the helicopter.
Actions Since AD 20051208 Was Issued Since the FAA issued AD 200512
08, the European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20210088, dated March 24, 2021.

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