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Federal Register / Vol. 86, No. 47 / Friday, March 12, 2021 / Rules and Regulations
and replacing the bearing, repetitive replacements of the bearing; and modifying the helicopter by replacing the TGB.
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.

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.

The FAA is issuing this AD to address damage to the bearing, which could result in end play, loss of tail rotor pitch control, and subsequent loss of control of the helicopter. See the MCAI for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.

Related Service Information Under 1
CFR Part 51

Update to the Costs of Compliance The FAA has updated the costs for the new required actions and on-condition actions based on data received since the NPRM was issued.
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
Explanation of Retained Requirements
EASA AD 20170125 describes procedures for modifying the helicopter by replacing TGB control shaft guide bushes, repetitive inspections checks of the oil level of the tail rotor gearbox and, if necessary, filling the oil to the maximum level, repetitive inspections of the TGB magnetic plug for the presence of particles and corrective actions if necessary corrective actions include removing the TGB, complying with certain work cards to address particles and other conditions such as abrasions, scales, flakes, and splinters,
Although this AD does not explicitly restate the requirements of AD 2016
2305, this AD retains certain requirements of AD 20162305. Those requirements are referenced in paragraphs 2 and 5 of EASA AD
20170125, which, in turn, is referenced in paragraph g of this AD.
Costs of Compliance The FAA estimates that this AD
affects 52 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
Retained actions from AD 20162305.
New actions

17 work-hours $85 per hour = $1,445

$1,125

$2,570

$133,640.

71 work-hours $85 per hour = $6,035

Up to $155,300

Up to $161,335

Up to $8,389,420.

ESTIMATED COSTS FOR OPTIONAL ACTIONS
Labor cost
Parts cost
Cost per product
Up to 8 work-hours $85 per hour = $680

$0

$680

Labor cost
Parts cost
Cost per product
Up to 4 work-hours $85 per hour = $340

Up to $1,395

Up to $1,735

ESTIMATED COSTS OF ON-CONDITION ACTIONS

According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected operators. The FAA does not control warranty coverage for affected operators.
As a result, the FAA has included all known costs in this cost estimate.
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.

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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
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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.

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