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Federal Register / Vol. 86, No. 171 / Wednesday, September 8, 2021 / Rules and Regulations
4 You may view this service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110.
5 You may view this service information that is incorporated by reference at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email: fr.inspection@nara.gov, or go to:
https www.archives.gov/federal-register/cfr/
ibr-locations.html.
Issued on August 13, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202119243 Filed 9721; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210450; Project Identifier 2017SW100AD; Amendment 3921680; AD 20211617
RIN 2120AA64

Airworthiness Directives; Airbus Helicopters Deutschland GmbH AHD
Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for Airbus Helicopters Deutschland GmbH AHD
Model MBBBK 117 D2 helicopters.
This 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. This AD requires determining the total hours time-inservice TIS of a certain part-numbered rotor mast nut and re-identifying a certain part-numbered rotor mast nut.
This AD also requires establishing a life limit for a certain part-numbered rotor mast nut and helical gear support, and removing each part from service before reaching its life limit. Additionally, this AD requires replacing a certain partnumbered main gearbox MGB with a not affected MGB as specified in a European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD, which is incorporated by reference IBR. The FAA is issuing this AD to address the unsafe condition on these products.

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SUMMARY:

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DATES:

This AD is effective October 13, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of October 13, 2021.
ADDRESSES: For EASA material incorporated by reference IBR in this AD, contact the EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; telephone +49 221 8999 000;
email ADs@easa.europa.eu; internet www.easa.europa.eu. You may find this material on the EASA website at https
ad.easa.europa.eu. 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. For information on the availability of this material at the FAA, call 817 2225110. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210450.

BK 117 D2 helicopters, with an affected MGB or affected rotor mast nut as identified in Note 1 of EASA AD
20170037. The NPRM published in the Federal Register on June 7, 2021 86 FR
30218. The NPRM 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 NPRM proposed to 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 AD and except as discussed under Differences Between this AD and EASA AD 20170037. The FAA is issuing this AD to address an unsafe condition on these products. See EASA AD 20170037 for additional background information.

Examining the AD Docket
Discussion of Final Airworthiness Directive
You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210450; 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, any comments received, and other information. The street 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: 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:
Background EASA AD 20170037, dated February 22, 2017 EASA AD 20170037, issued by EASA, which is the Technical Agent for the Member States of the European Union, 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.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to Airbus Helicopters Deutschland GmbH AHD Model MBB

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Comments The FAA received no comments on the NPRM or on the determination of the costs.
Conclusion These helicopters 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
about the unsafe condition described in its AD. 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.
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 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
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