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Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Rules and Regulations
applying torque, installing lock wire, and re-identifying the M/R slip ring.
This AD also prohibits the installation of certain M/R slip rings. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 3, 2021.
The Director of the Federal Register approved the incorporation by reference of certain documents listed in this AD
as of August 3, 2021.
ADDRESSES: For Leonardo Helicopters and Moog service information identified in this final rule, contact Leonardo S.p.A. Helicopters, Emanuele Bufano, Head of Airworthiness, Viale G.Agusta 520, 21017 C.Costa di Samarate Va Italy; telephone +390331225074; fax +390331229046; or at https
www.leonardocompany.com/en/home.
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. Service information that is incorporated by reference is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0304.

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210304; 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 European Aviation Safety Agency now European Union Aviation Safety Agency EASA ADs, 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:
Steven Warwick, Aerospace Engineer, Certification Section, Fort Worth ACO
Branch, Compliance & Airworthiness Division, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817 222
5225; email steven.r.warwick@faa.gov..
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to Leonardo S.p.a. Type Certificate previously held by Agusta S.p.A. Model AB139 and AW139
helicopters and Leonardo S.p.a. Type Certificate previously held by
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AgustaWestland S.p.A. Model AW189
helicopters with an M/R slip ring part number P/N 4G6220V00151 with a serial number S/N up to and including S/N 0141, except those marked with an L following the S/N, installed. The NPRM published in the Federal Register on April 19, 2021 86 FR
20338. In the NPRM, the FAA proposed to require, with the M/R slip ring removed, inspecting each screw and double-twist lock wire of the upper connecter end and lower pigtail or standpipe end fasteners of the M/R slip ring. Depending on the outcome, the NPRM proposed to require marking the M/R slip ring; removing the M/R slip ring from service; or removing screws and washers, lock wire, and ferrule ended safety cable from service, installing new screws and washers, applying torque, installing double-twist lock wire, and marking the M/R slip ring. The NPRM also proposed to prohibit the installation of an affected M/R slip ring unless the proposed requirements have been completed. The NPRM was prompted by EASA AD
20170083, dated May 10, 2017 EASA
AD 20170083, to correct an unsafe condition for Leonardo S.p.A. formerly Finmeccanica S.p.A, AgustaWestland S.p.A., Agusta S.p.A, AgustaWestland Philadelphia Corporation formerly Agusta Aerospace Corporation Model AB139 and AW139 helicopters, and EASA AD 20170087, dated May 12, 2017 EASA AD 20170087, to correct the same unsafe condition for Leonardo S.p.A. Helicopters formerly Finmeccanica S.p.A, AgustaWestland S.p.A. Model AW189 helicopters, each issued by EASA, which is the Technical Agent for the Member States of the European Union. EASA advises of reports of missing lock wire and loose fasteners found during inspections of the M/R slip ring of Model AW139
helicopters. EASA also advises that the same part-numbered M/R slip ring may also be installed on Model AW189
helicopters. Model AB139 helicopters may also be affected by this unsafe condition due to having the same type design as Model AW139 helicopters.
EASA ADs 20170083 and 20170087
require a one-time visual inspection of the M/R slip ring fastener installation, and depending on the outcome, replacing the M/R slip ring, replacing fasteners, applying torque, installing lock wire, and re-identifying the M/R
slip ring. EASA ADs 20170083 and 20170087 also prohibit installation of an affected M/R slip ring. EASA states, this condition, if not detected and corrected, could lead to failure of the M/
R slip ring bearing inner race, possibly
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resulting in damage to drive system components and subsequent reduced control of the helicopter.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.
Conclusion 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 about the unsafe condition described in its ADs. 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 helicopters. 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 Leonardo Helicopters Alert Service Bulletin ASB
No. 139472, dated May 9, 2017 ASB
139472, for Model AB139 and AW139
helicopters, and Leonardo Helicopters ASB No. 189138, dated May 12, 2017
ASB 189138, for Model AW189
helicopters. ASB 139472 and ASB
189138 specify inspecting the M/R slip ring by following the procedures in Moog Service Bulletin SB 1601, Revision 5, undated SB 1601, which is attached as Annex A to both ASB
139472 and ASB 189138. ASB 139
472 and ASB 189138 are incorporated by reference in this AD. SB 1601 is not incorporated by reference in this AD.
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.
Other Related Service Information The FAA also reviewed SB 1601, which specifies procedures to visually inspect the M/R slip ring upper connecter end and lower pigtail or standpipe end fastener screws and double-twist lock wire.
Differences Between This AD and the EASA ADs EASA ADs 20170083 and 20170087
include the compliance time of at the next M/R slip ring removal, whereas this AD does not because it could be difficult to track. This AD has a shorter compliance time for all affected M/R
slip rings that have accumulated 900 or
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