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Federal Register / Vol. 86, No. 97 / Friday, May 21, 2021 / Proposed Rules TGB. EASA considered its AD an interim action and stated that further AD action may follow.
Actions Since AD 20201911 Was Issued Since the FAA issued AD 202019
11, EASA issued EASA AD 20200206, dated September 30, 2020 EASA AD
20200206, which supersedes EASA
AD 20180156. 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. Accordingly, EASA AD 20200206 retains the inspection requirements of EASA AD
20180156 for certain part numbered TGB shafts and revises the definition of an affected part by adding certain serialnumbered TGB shafts.
FAAs Determination 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 is proposing this AD after evaluating all known relevant information and determining that the unsafe condition described previously is likely to exist or develop on other products of the same type designs.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Leonardo Helicopters Alert Service Bulletin ASB
No. 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.

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Proposed AD Requirements in This NPRM
This proposed AD would retain certain requirements of AD 20201911.
This proposed AD would revise the compliance time for the repetitive inspections from intervals not to exceed 100 hours TIS or 6 months to only intervals not to exceed 6 months. This proposed AD would also revise the applicability paragraph by adding certain serial-numbered TGB shafts.

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Differences Between This Proposed AD
and the EASA AD
The EASA AD uses flight hours to describe one compliance time, whereas this proposed AD would use hours TIS.
The EASA AD requires using an endoscope for inspection, whereas this proposed AD would require inspecting with a borescope. The EASA AD defines the affected part as the 90-degree TGB
shaft installed on TGB P/N 1090440
0601101, whereas the applicability paragraph of this proposed AD would include TGB P/N 109044006101
instead.
Interim Action The FAA considers this proposed AD
an interim action.
Costs of Compliance The FAA estimates that this proposed AD would affect 134 helicopters of U.S.
Registry. The FAA estimates that operators may incur the following costs in order to comply with this proposed AD. Labor costs are estimated at $85 per work-hour.
Borescope inspecting the TGB output shaft would take 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 would take about 18
work-hours and parts would 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 proposed 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 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.

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Regulatory Findings The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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, I certify this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would 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 Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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:
a. Removing Airworthiness Directive AD 20201911, Amendment 39
21254 85 FR 59404, September 22, 2020; and b. Adding the following new AD:

Leonardo S.p.a: Docket No. FAA20210373;
Project Identifier MCAI202001352R.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD action by July 6, 2021.
b Affected ADs This AD replaces AD 20201911, Amendment 3921254 85 FR 59404, September 22, 2020; AD 20201911.
c Applicability This AD applies to Leonardo S.p.a. Model A119 and AW119 MKII helicopters, certificated in any category, with 90-degree tail rotor gearbox TGB part number P/N
109044006101 or 109044006105, and with TGB shaft P/N 109044303107 having a serial number S/N listed in Table 1 of Leonardo Helicopters Alert Service Bulletin No. 119090, Revision A, dated September 14, 2020 ASB 119090, installed.

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