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Federal Register / Vol. 86, No. 93 / Monday, May 17, 2021 / Rules and Regulations
maintenance tasks before reaching their published periodicity, and performing unscheduled maintenance tasks when the engine meets certain conditions. As a terminating action, this AD requires operators to revise the airworthiness limitation section ALS of their existing approved aircraft maintenance program AMP by incorporating the revised airworthiness limitations and maintenance tasks. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective June 21, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of June 21, 2021.
ADDRESSES: For service information identified in this final rule, contact Safran Helicopter Engines, S.A., 64511
BordesCedex, France; phone: 33 05
59 74 40 00; fax: 33 05 59 74 45 15.
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. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20201038.

apply to all Safran Arriel 2D and Arriel 2E model turboshaft engines. The NPRM
published in the Federal Register on November 30, 2020 85 FR 76492. The NPRM was prompted by the manufacturer revising the maintenance and overhaul manuals to introduce new or more restrictive airworthiness limitations and maintenance tasks. In the NPRM, the FAA proposed to require the replacement of certain critical parts before reaching their published inservice life limits, performing scheduled maintenance tasks before reaching their published periodicity, and performing unscheduled maintenance tasks when the engine meets certain conditions specified in the applicable Safran Arriel maintenance manual MM chapter. As a terminating action, the NPRM
proposed to require operators to revise the ALS of their existing approved AMP
by incorporating the revised airworthiness limitations and maintenance tasks. The FAA is issuing this AD to address the unsafe condition on these products.
The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20180273, dated December 13, 2018 referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI states:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201038; 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 final rule, the mandatory continuing airworthiness information MCAI, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
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:

The airworthiness limitations and maintenance tasks for the SAFRAN ARRIEL
2D, ARRIEL 2E and ARRIEL 2N engines, which are approved by EASA, are currently defined and published in the SAFRAN
ARRIEL 2 Maintenance and Overhaul Manuals, as applicable. These instructions have been identified as mandatory for continued airworthiness.
Failure to accomplish these instructions could result in an unsafe condition.
SAFRAN recently revised the applicable Maintenance and Overhaul Manuals the applicable ALS, introducing new and/or more restrictive airworthiness limitations and maintenance tasks.
For the reason described above, this EASA AD requires accomplishment of the actions specified in the applicable ALS.

Background
Comments The FAA received no comments on the NPRM or on the determination of the costs.

The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would
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You may obtain further information by examining the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20201038.
Discussion of Final Airworthiness Directive
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Conclusion The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Section 051000, Airworthiness Limitations, of Chapter 05, Airworthiness Limitations FrequenciesInspections, of the Safran Helicopter Engines ARRIEL 2D
Maintenance Manual, Volume 1, No. X
292 R1 450 2, Update No. 20, dated June 15, 2020. Safran Helicopter Engines ARRIEL 2D Maintenance Manual No.
X292 R1 450 2 identifies the terms used in tables for limits and mandatory maintenance tasks, usage counters of the engine log book, life limits for lifelimited parts, and mandatory inspection tasks to be carried out to reach the airworthiness objectives on Safran Arriel 2D model engines.
The FAA reviewed Section 051000, Airworthiness Limitations, of Chapter 05, Airworthiness Limitations FrequenciesInspections, of the Safran Helicopter Engines ARRIEL 2E
Maintenance Manual No. X 292 R2 300
2, Update No. 16, dated June 15, 2020.
Safran Helicopter Engines ARRIEL 2E
Maintenance Manual No. X292 R2 300
2 identifies the terms used in tables for limits and mandatory maintenance tasks, usage counters of the engine log book, life limits for life-limited parts, and mandatory inspection tasks to be carried out to reach the airworthiness objectives on Safran Arriel 2E model engines.
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 ADDRESSES.
Costs of Compliance The FAA estimates that this AD
affects 426 engines installed on helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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