Quiero saber acerca de...

Federal Register / Vol. 86, No. 36 / Thursday, February 25, 2021 / Rules and Regulations these inspections. The EASA AD
requires inspecting the threads of nut P/
N MS178257 for damage, but does not state what to do if the threads have damage. This AD requires inspecting for damage to the threads of the nut indicated by uneven threads, missing threads, or cross-threading, and if the nut has any damaged threads, removing the nut from service.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Leonardo EASB
No. 119105, Revision A, dated June 3.
2020 EASB 119105 Rev A, which specifies a one-time inspection of the tightening torque of T/R plug P/N 129
016045103, and a one-time inspection for correct installation of the inboard and outboard faces of T/R duplex bearing P/N 129016011103, for damage to the threads of the T/R plug and nut P/N MS178257, and of the T/
R duplex bearing for roughness, ease of rotation, and presence of brinelling, spalling, chipping, and flaking or traces of overheating of bearing balls, and general damage to races.
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.
Other Related Service Information The FAA also reviewed EASB 119
100, which specifies the same procedures as EASB 119105 Rev A, except EASB 119100 also specifies repeating the inspection for correct installation of the inboard and outboard faces of T/R duplex bearing P/N 129
016011103, for damage to the threads of the T/R plug and nut P/N MS17825
7, and of the T/R duplex bearing for roughness, ease of rotation, and presence of brinelling, spalling, chipping, and flaking or traces of overheating of bearing balls, and general damage to races in conjunction every 200 hours TIS or at any removal, installation, or disassembly of the T/R
duplex bearing.
The FAA also reviewed Leonardo Helicopters EASB No. 119105, dated May 18, 2020, which contains the same procedures as EASB 119105 Rev A, except EASB 119105 Rev A applies to additional serial-numbered helicopters.
Costs of Compliance The FAA estimates that this AD
affects 89 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.

VerDate Sep<11>2014

16:18 Feb 24, 2021

Jkt 253001

Inspecting the tightening torque of the T/R plug takes about 0.5 work-hour for an estimated cost of $43 per helicopter and $3,827 for the U.S. fleet.
Inspecting for correct installation of the outboard and inboard faces of the T/
R duplex bearing and the condition of the T/R duplex bearing, T/R plug threads, and nut threads takes about 2
work-hours for an estimated cost of $170 per helicopter and $15,130 for the U.S. fleet, per inspection cycle.
Assembling and installing the T/R
duplex bearing assembly takes about 2
work-hours for an estimated cost of $170 per helicopter and $15,130 for the U.S. fleet, per inspection cycle.
If required, the parts for replacing the T/R duplex bearing, internal spacer, external spacer, bearing liner assembly, and T/R control rod cost about $4,200, and parts for replacing the T/R plug cost about $171.
The FAA has included all known costs in this cost estimate. However, according to Leonardo, some of the costs of this 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.
Regulatory Findings The FAA has determined that 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,
PO 00000

Frm 00023

Fmt 4700

Sfmt 4700

11409

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:
a. Removing Airworthiness Directive AD 20201302, Amendment 39
21147 85 FR 37551, June 23, 2020; and b. Adding the following new AD:

20210315 Leonardo S.p.a.: Amendment 3921418; Docket No. FAA20201026;
Project Identifier MCAI202000745R.
a Applicability This airworthiness directive AD applies to Leonardo S.p.a. Model A119 and AW119
MKII helicopters, certificated in any category, with a tail rotor T/R duplex bearing part number P/N 129016011103 T/R duplex bearing installed.
b Unsafe Condition This AD defines the unsafe condition as structural failure of the T/R assembly, possibly due to an incorrect installation. This condition could result in loss of T/R pitch change control and subsequent loss of control of the helicopter.
c Affected ADs This AD replaces AD 20201302, Amendment 3921147 85 FR 37551, June 23, 2020 AD 20201302.
d Effective Date This AD becomes effective April 1, 2021.
e 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.
f Required Actions 1 Within 10 hours time-in-service TIS, remove the lockwire that secures the T/R
plug P/N 129016045103 T/R plug to the bearing liner assembly P/N 109013516101
bearing liner assembly. Without loosening the T/R plug first, inspect the tightening
E:FRFM25FER1.SGM

25FER1