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Federal Register / Vol. 86, No. 160 / Monday, August 23, 2021 / Rules and Regulations
the inspection requirements of AD
20201911, and revises the compliance time and applicability. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective September 27, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of September 27, 2021.
ADDRESSES: For 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 +39
0331225074; fax +390331229046; or at https
customerportal.leonardocompany.com/
en-US/. 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. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210373.

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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.
FAA20210373; 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 Union Aviation Safety Agency EASA AD, 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: 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 The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20201911, Amendment 3921254 85 FR 59404, September 22, 2020 AD 20201911.
AD 20201911 applied to Leonardo S.p.a. Model A119 and AW119 MKII
helicopters with TGB part number P/N
109044006101 or P/N 109044006

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105 having serial number S/N 167, 169
through 172 inclusive, 215 through 225
inclusive, 227, 230, 232, 233, AW268, K3, K16, M47, or L29, installed. The NPRM published in the Federal Register on May 21, 2021 86 FR 27538.
In the NPRM, the FAA proposed to retain certain requirements of AD 2020
1911, revise the compliance time for the repetitive inspections from intervals not to exceed 100 hours time-in-service TIS or 6 months to only intervals not to exceed 6 months, and revise the applicability paragraph by adding certain serial-numbered TGB shafts. The NPRM was prompted by EASA AD
20200206, dated September 30, 2020
EASA AD 20200206, issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for Leonardo S.p.A. Helicopters, formerly Finmeccanica S.p.A., AgustaWestland S.p.A., Agusta S.p.A.;
and AgustaWestland Philadelphia Corporation, formerly Agusta Aerospace Corporation. EASA advises that additional parts may be susceptible to similar occurrences and some TGB
shafts could have been reinstalled on a TGB other than the one on which they were initially installed. This condition, if not addressed, could result in failure of the tail rotor, possibly resulting in reduced control of the helicopter.
Accordingly, EASA AD 20200206
retains the inspection requirements of EASA AD 20180156, dated July 24, 2018, which prompted AD 20201911, for certain part-numbered TGB shafts and revises the definition of an affected part by adding certain serial-numbered TGB shafts.
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 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 helicopters.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Leonardo Helicopters Alert Service Bulletin No.

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119090, Revision A, dated September 14, 2020. This service information specifies procedures for conducting an endoscope inspection of the internal surface of the TGB output shaft for corrosion. This service information also specifies replacing the TGB if corrosion is found.
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.
Interim Action The FAA considers this AD to be an interim action.
Differences Between This AD and the EASA AD
EASA AD 20200206 uses flight hours to describe one compliance time, whereas this AD uses hours TIS. EASA
AD 20200206 requires using an endoscope for inspection, whereas this AD requires inspecting with a borescope. EASA AD 20200206 defines the affected part as the 90-degree TGB
shaft installed on TGB P/N 1090440
0601101, whereas the applicability paragraph of this AD includes TGB P/
N 109044006101 instead.
Costs of Compliance The FAA estimates that this AD
affects 134 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates the following costs to comply with this AD.
Borescope inspecting the TGB output shaft takes about 3 work-hours for an estimated cost of $255 per helicopter and $34,170 for the U.S. fleet per inspection cycle.
Replacing a TGB takes about 18 workhours and parts cost about $49,000
overhauled TGB for an estimated cost of $50,530 per helicopter.
The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under
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