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Federal Register / Vol. 86, No. 33 / Monday, February 22, 2021 / Rules and Regulations
manufacturer monogram D or with an illegible manufacturer monogram installed on the forward T/R drive shaft and, depending on the inspection results, replacing the Ti-bolt. The EASA
AD also prohibits the reinstallation of these Ti-bolts.
Comments The FAA gave the public the opportunity to participate in developing this final rule, but the FAA did not receive any comments on the NPRM or on the determination of the cost to the public.
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 of the unsafe condition described in its AD. The FAA is issuing this AD
after evaluating all of the information provided by EASA and determining the unsafe condition exists and is likely to exist or develop on other helicopters of these same type designs and that air safety and the public interest require adopting the AD requirements as proposed.

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Differences Between This AD and the EASA AD
The EASA AD applies to Model EC135 P1, EC135 P2, EC135 P2+, EC135
P3, EC135 T1, EC135 T2, EC135 T2+, EC135 T3, EC635 P2+, EC635 P3, EC635
T1, EC635 T2+, and EC635 T3
helicopters and requires inspecting Tibolt P/N L535M2001203 marked with manufacturer monogram D or with an illegible manufacturer monogram installed on the forward T/R drive shaft.
This AD applies to Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, and EC135T3 helicopters with a Ti-bolt P/N
L535M2001203 marked with manufacturer monogram D or with an illegible manufacturer monogram installed on the forward T/R drive shaft instead. This AD does not apply to Model EC635 P2+, EC635 P3, EC635 T1, EC635 T2+, or EC635 T3 helicopters because these models are not FAA typecertificated. The EASA AD requires discarding the affected Ti-bolts, whereas this AD requires removing the affected Ti-bolts from service instead.
Related Service Information The FAA reviewed Airbus Helicopters Alert Service Bulletin ASB No. EC135
00A001, Revision 1, dated September 2, 2019, for Airbus Helicopters Deutschland GmbH Model EC135 T1, T2, T2+, T3, P1, P2, P2+, P3, 635 T1,
VerDate Sep<11>2014

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635 T2+, 635 T3, 635 P2+, and 635 P3
helicopters, and Airbus Helicopters ASB
No. EC135H00A001, Revision 1, dated September 2, 2019, for Airbus Helicopters Deutschland GmbH Model EC135, T3H, P3H, 635 T3H, and 635
P3H helicopters. This service information specifies inspecting the forward T/R drive shaft, distance plate of the 5B0.502.50PXN1 antenna, main rotor controls, FWD connection of ball bearing control, and AFT
connection of ball bearing control and yaw actuator for the installation of Tibolt P/N L535M2001203, EN3308
040020F, L221M1040201, EN3740
060020F, and EN3308060020F, marked with manufacturer monogram D or an illegible manufacturer monogram. If a specified Ti-bolt is installed, the service information specifies replacing the Tibolt and discarding the removed Ti-bolt.
Costs of Compliance The FAA estimates that this AD
affects 326 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates that operators may incur the following costs in order to comply with this AD.
Replacing a Ti-bolt takes about four work-hours and parts cost about $82 for an estimated cost of $422 per Ti-bolt.
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 helicopters 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
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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.
Adoption of the Amendment 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:

20210304 Airbus Helicopters Deutschland GmbH: Amendment 39
21407; Docket No. FAA20201037;
Project Identifier 2019SW077AD.
a Applicability This airworthiness directive AD applies to Airbus Helicopters Deutschland GmbH
Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, and EC135T3 helicopters, certificated in any category, with a Titanium Ti bolt part number L535M2001203 marked with manufacturer monogram D or with an illegible manufacturer monogram installed on the forward tail rotor drive shaft.
Note 1 to paragraph a: Helicopters with an EC135P3H designation are Model EC135P3 helicopters. Helicopters with an EC135T3H designation are Model EC135T3
helicopters.
b Unsafe Condition This AD defines the unsafe condition as failure of an affected Ti-bolt installed in a critical location, possibly resulting in reduced control of the helicopter.
c Effective Date This AD becomes effective March 29, 2021.
d Compliance You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.

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