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Federal Register / Vol. 86, No. 221 / Friday, November 19, 2021 / Rules and Regulations
helicopter model. During revisions to the Model A109E technical publications it was noted that the 90-degree tail rotor gearbox assembly, part number P/N
109044001115, is included in the illustrated parts catalog IPC for helicopters with serial numbers S/N
up to and including S/N 11160. The IPC
incorrectly identifies this part number as a replacement part for P/N 1090440
01119 or P/N 109044001121. The NPRM proposed to require replacement of each affected tail rotor gearbox assembly with a serviceable part, as specified in EASA AD 20210031.
The FAA is issuing this AD to address installation of tail rotor gearbox assembly P/N 109044001115 that is not approved for installation on Model A109E helicopters. Because P/N 109
044001115 is not part of the type design for Model A109E helicopters, there are no overhaul or life limits included in the applicable maintenance
manuals. If a tail rotor gearbox is not properly maintained it could fail, resulting in reduced control of the helicopter. See EASA AD 20210031 for additional background information.
Discussion of Final Airworthiness Directive Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.
Conclusion The FAA reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
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 20210031 requires replacement of a tail rotor gearbox assembly P/N 109044001115 with a serviceable part. EASA AD 20210031
also prohibits installation of tail rotor gearbox assembly P/N 109044001
115 on any Leonardo S.p.A. Model A109E helicopter.
This material 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.
Costs of Compliance The FAA estimates that this AD
affects 70 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Replacement

12 work-hours $85 per hour = $1,020

The FAA has included all known costs in its cost estimate. According to the manufacturer, however, some of the costs may be covered under warranty, thereby reducing the cost impact on affected operators.

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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 that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

Parts cost
substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES

Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a
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21:40 Nov 18, 2021

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1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.

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Cost per product
$82,500

39.13

$83,520

Cost on U.S.
operators $5,846,400

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20212210 Leonardo S.p.a.: Amendment 3921783; Docket No. FAA20210695;
Project Identifier MCAI202100096R.
a Effective Date This airworthiness directive AD is effective December 27, 2021.
b Affected ADs None.
c Applicability This AD applies to Leonardo S.p.a. Model A109E helicopters, certificated in any category, with an affected part as identified in European Union Aviation Safety Agency EASA AD 20210031, dated January 22, 2021 EASA AD 20210031 installed.
d Subject Joint Aircraft Service Component JASC
Code: 6520, Tail Rotor Gearbox.
e Unsafe Condition This AD was prompted by reports that certain tail rotor gearbox assemblies were installed on Model A109E helicopters and those parts are not approved for installation on that helicopter model. Because tail rotor gearbox assembly part number P/N 109
044001115 is not part of the type design for Model A109E helicopters, there are no overhaul or life limits included in the applicable maintenance manuals. The FAA is issuing this AD to address installation of tail
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