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Federal Register / Vol. 86, No. 159 / Friday, August 20, 2021 / Rules and Regulations
4F5350A04152 and removing that part from service accordingly instead.
Costs of Compliance The FAA estimates that this AD
affects 4 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.
Replacing a tail gearbox fitting takes about 48 work-hours and parts cost about $30,000 for an estimated cost of $34,080 per helicopter and $136,320 for the U.S. fleet, per replacement cycle.
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 helicopters identified in this rulemaking action.

khammond on DSKJM1Z7X2PROD with RULES

Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a 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.

16:42 Aug 19, 2021

Jkt 253001

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

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

Authority for This Rulemaking
VerDate Sep<11>2014

The Amendment
20211716 Leonardo S.p.a.: Amendment 3921699; Docket No. FAA20210455;
Project Identifier 2018SW031AD.
a Effective Date This airworthiness directive AD is effective September 24, 2021.
b Affected ADs None.
c Applicability This AD applies to Leonardo S.p.a. Model AW189 helicopters, certificated in any category, with tail gearbox fitting part number P/N 4F5350A04152 installed.
d Subject Joint Aircraft Service Component JASC
Code: 6520, Tail Rotor Gearbox.

h Alternative Methods of Compliance AMOCs 1 The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the International Validation Branch, send it to the attention of the person identified in paragraph i1 of this AD.
Information may be emailed to: 9-AVS-AIR730-AMOC@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.
i Related Information 1 For more information about this AD, contact Kristi Bradley, Program Manager, COS Program Management Section, Operational Safety Branch, Compliance &
Airworthiness Division, FAA, 10101
Hillwood Pkwy., Fort Worth, TX 76177;
telephone 817 2225110; email kristin.bradley@faa.gov.
2 The subject of this AD is addressed in European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD 20180087, dated April 18, 2018.
You may view the EASA AD on the internet at https www.regulations.gov in Docket No.
FAA20210455.
j Material Incorporated by Reference None.

e Unsafe Condition This AD was prompted by fatigue testing and analyses. The FAA is issuing this AD to prevent parts from remaining in service beyond their fatigue life. The unsafe condition, if not addressed, could result in failure of a part, which could result in loss of control of the helicopter.

Issued on August 13, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.

f Compliance Comply with this AD within the compliance times specified, unless already done.

DEPARTMENT OF TRANSPORTATION

g Required Actions Before further flight after the effective date of this AD:
1 Determine the total hours time-inservice TIS and total number of landings of tail gearbox fitting P/N 4F5350A04152. For purposes of this AD, a landing is counted anytime a helicopter lifts off into the air and then lands again regardless of the duration of the landing and regardless of whether the engine is shutdown. If the total hours TIS
and total number of landings cannot be determined, before further flight, remove the part from service.
2 Remove any part from service that has reached or exceeded its life limit as follows.
Thereafter, remove any part from service on or before reaching its life limit as follows.
Tail gearbox fitting P/N 4F5350A04152:
14,600 total hours TIS or 57,300 total landings, whichever occurs first.

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FR Doc. 202117841 Filed 81921; 8:45 am BILLING CODE 491013P

Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210672; Project Identifier MCAI202100304R; Amendment 3921693; AD 20211710
RIN 2120AA64

Airworthiness Directives; Leonardo S.p.a Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Leonardo S.p.a. Model A109A, A109A
II, A109C, A109E, A109K2, A109S, and AW109SP helicopters, having a certain rotor brake kit installed. This AD was
SUMMARY:

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