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Federal Register / Vol. 86, No. 42 / Friday, March 5, 2021 / Rules and Regulations NARA. For information on the availability of this material at NARA, email fedreg.legal@
nara.gov, or go to: https www.archives.gov/
federal-register/cfr/ibr-locations.html.
Issued on February 9, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202104350 Filed 3421; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210132; Project Identifier MCAI202000947E; Amendment 3921466; AD 20210522
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: Final rule; request for comments.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Safran Helicopter Engines, S.A. Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, Arriel 1D1, Astazou XIV B, and Astazou XIV H model turboshaft engines. This AD was prompted by the detection of positive segregation freckles on Stage 2 high-pressure turbine HPT disks and Stage 3 turbine wheels. This AD requires removal from service of certain Stage 2 HPT disks for Safran Helicopter Engines Arriel 1B, 1C, 1C2, and 1D1 model turbofan engines and affected Stage 3 turbine wheels for Safran Helicopter Engines Astazou XIV
B and XIV H model turbofan engines.
The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective March 22, 2021.
The FAA must receive comments on this AD by April 19, 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: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.

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SUMMARY:

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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 final rule, contact Safran Helicopter Engines, S.A., Avenue du 1er Mai, Tarnos, France; phone: +33 0 5 59 74
45 11. 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.
FAA20210132.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210132; 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 street address for the 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:
Background The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20200151E, dated July 9, 2020, for Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1
model turboshaft engines, and AD
20200161E, dated July 17, 2020, for Safran Helicopter Engines Astazou XIV
B and Astazou XIV H model turboshaft engines to address an unsafe condition for the specified products. EASA AD
20200151E states:
Positive segregation freckles was detected on Stage 2 HP turbine discs manufactured from a certain block of material. Other parts manufactured from that same block of material may also be affected by this nonconformity.
This condition, if not corrected, could lead to HP turbine disc failure and result in highenergy debris release, with consequent damage to, and reduced control of, the helicopter.
To address this unsafe condition, SAFRAN
issued the MSB, as defined in this EASA
AD, to identify affected HP turbine discs and provide instructions for replacement.

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For the reason described above, this EASA AD requires replacement of affected parts with serviceable parts, and prohibits reinstallation of affected parts.

EASA AD 20200161E states:
Positive segregation freckles was detected on Stage 3 turbine wheels manufactured from a certain block of material. Other parts manufactured from that same block of material may also be affected by this nonconformity.
This condition, if not corrected, could lead to turbine wheel failure and result in highenergy debris release, with consequent damage to, and reduced control of, the helicopter.
To address this unsafe condition, SAFRAN
issued the MSB, as defined in this EASA
AD, to identify affected turbine wheels and provide instructions for replacement.
For the reason described above, this EASA AD requires replacement of affected parts with serviceable parts, and prohibits reinstallation of affected parts.

You may obtain further information by examining the MCAIs in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210132.
FAAs Determination This product has been approved by EASA and is approved for operation in the United States. Pursuant to our bilateral agreement with the European Community, EASA has notified us of the unsafe condition described in the MCAI. The FAA is issuing this AD
because the agency evaluated all the relevant information provided by EASA
and has determined that the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Related Service Information The FAA reviewed Safran Mandatory Service Bulletin MSB 292 72 0860, Version A, dated July 9, 2020 MSB 292
72 0860. MSB 292 72 0860 identifies affected Stage 2 HPT disks and describes procedures for removing and replacing affected Stage 2 HPT disks on Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1
model turbofan engines. The FAA also reviewed Safran MSB 283 72 0814, Version A, dated July 16, 2020 MSB
283 72 0814. MSB 283 72 0814
describes procedures for replacing the Stage 3 turbine wheel on Safran Helicopter Engines Astazou XIV B and Astazou XIV H model turbofan engines.
AD Requirements This AD requires the removal from service and replacement of affected Stage 2 HPT disks for Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1 model turbofan engines.

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