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Federal Register / Vol. 86, No. 171 / Wednesday, September 8, 2021 / Rules and Regulations Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this final rule as proposed, except for minor editorial changes. The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the NPRM for addressing the unsafe condition; and Do not add any additional burden upon the public than was already proposed in the NPRM.

Related Service Information Under 1
CFR Part 51
EASA AD 20200282 requires a onetime inspection dimensional check to verify TRB conformity, and, depending on findings, replacement of each affected part classified as Category B
non-compliant TRB assembly. EASA
AD 20200282 also prohibits rework, repair, or modification of affected parts in the critical section affected area of the TRB assembly root.

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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 341 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
4 work-hours $85 per hour = $340

$0

$340

$115,940

The FAA estimates the following costs to do any necessary on-condition actions that would be required based on
the results of any required actions. The FAA has no way of determining the
number of helicopters that might need these on-condition actions:

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
Cost per product
10 work-hours $85 per hour = $850

$4,400

$5,250

jbell on DSKJLSW7X2PROD with RULES

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.
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.

VerDate Sep<11>2014

16:25 Sep 07, 2021

Jkt 253001

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.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

20211610 Airbus Helicopters Deutschland GmbH: Amendment 39
21672; Docket No. FAA20210380;
Project Identifier MCAI202001683R.
a Effective Date This airworthiness directive AD is effective October 13, 2021.
b Affected ADs None.
c Applicability This AD applies to Airbus Helicopters Deutschland GmbH Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, and EC135T3
helicopters, certificated in any category, with any of the tail rotor blade TRB part numbers specified in paragraphs c1 through 5 of this AD installed.
1 Part number P/N L642A2002101.
2 P/N L642A2002103.
3 P/N L642A2002104.
4 P/N L642A2002111.
5 P/N L642A2002112.

PART 39AIRWORTHINESS
DIRECTIVES

d Subject Joint Aircraft System Component JASC
Code 6410, Tail Rotor Blades.

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

e Unsafe Condition This AD was prompted by a report that during an investigation related to an accident on an Airbus Helicopters Model EC130B4
helicopter, geometrical non-conformities were observed in the TRB root section. The FAA is issuing this AD to address geometrical non-conformities in the TRB root section, which could lead to crack initiation

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

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

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