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Federal Register / Vol. 86, No. 184 / Monday, September 27, 2021 / Rules and Regulations ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Torque check

1 work-hour $85 per hour = $85

The FAA estimates the following costs to do any necessary on-condition actions that are required based on the
Cost per product
Parts cost
results of any required actions. The FAA
has no way of determining the number
$0

Cost on U.S.
operators
$85

$8,330

of helicopters that might need these oncondition actions:

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Action
Labor cost
Repetitive torque check

1 work-hour $85 per hour = $85, per cycle

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.

lotter on DSK11XQN23PROD with RULES1

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.
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.

VerDate Sep<11>2014

16:20 Sep 24, 2021

Jkt 253001

Parts cost
Cost per product $0

$85, per cycle.

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

address tail rotor gearbox assemblies found loose on the gearbox support. The unsafe condition, if not addressed, could result in structural damage and possible loss of control of the helicopter.

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

f Compliance Comply with this AD within the compliance times specified, unless already done.

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:

20211816 Bell Textron Canada Limited Type Certificate Previously Held by Bell Helicopter Textron Canada Limited:
Amendment 3921717; Docket No.
FAA20210513; Project Identifier 2018SW116AD.
a Effective Date This airworthiness directive AD is effective November 1, 2021.
b Affected ADs None.
c Applicability This AD applies to Bell Textron Canada Limited type certificate previously held by Bell Helicopter Textron Canada Limited Model 429 helicopters, certificated in any category, serial numbers 57001 and subsequent.
d Subject Joint Aircraft Service Component JASC
Code: 6500, Tail Rotor Drive System; and 6520, Tail Rotor Gearbox.
e Unsafe Condition This AD was prompted by reports of tail rotor gearbox assemblies found loose on the gearbox support. The FAA is issuing this AD

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g Required Actions Within 12 months after the effective date of this AD; or at the next scheduled 200hours time-in-service TIS or 12-month inspection, whichever occurs first, do a torque check of the tail rotor gearbox attachment hardware, in accordance with the Accomplishment Instructions, paragraph 2., of Bell Alert Service Bulletin 4291841, dated July 24, 2018. Repeat the torque check thereafter at intervals not to exceed 200 hours TIS or 12 months, whichever occurs first.
h Corrective Actions If, during any torque check required by paragraph g of this AD, any tail rotor gearbox attachment moves during any torque check, repeat the torque check specified in paragraph g of this AD at intervals no less than 10 hours TIS and not to exceed 25 hours TIS until the torque stabilizes on all the nuts.
Stabilization has occurred when, at the next torque check, the value has remained within the specified acceptable limits 160 to 200
inch-pounds in-lbs or 19 to 22 newton meters Nms, inclusive, preventing movement of the gearbox housing. After the torque stabilizes on all the nuts, the repetitive torque checks specified in paragraph g of this AD are still required.
i Credit for Previous Actions This paragraph provides credit for the initial torque check required by paragraph g of this AD, if that action was done before the effective date of this AD as required by paragraph f2 of AD 20181651, Amendment 3919421 83 FR 53171, October 22, 2018.
j Alternative Methods of Compliance AMOCs 1 The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the
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