Federal Register - December 1, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 228 / Wednesday, December 1, 2021 / Proposed Rules tail rotor shaft and the TGB bevel wheel.
The investigation is still on-going to identify the root cause of the tightening torque loss. The FAA is proposing this AD to address loss of tightening torque on the nut that attaches the TGB bevel wheel, which, if not corrected, could lead to structural failure of the TGB
drive, resulting in reduced, or loss of, control of the helicopter. See EASA AD
20210184R1 for additional background information.
in the United States. Pursuant to the FAAs bilateral agreement with the European Union, EASA has notified the FAA about the unsafe condition described in its AD. The FAA is proposing this AD after evaluating all known relevant information and determining that the unsafe condition described previously is likely to exist or develop on other helicopters of the same type design.
Related Service Information Under 1
CFR Part 51
EASA AD 20210184R1 requires repetitive inspections measurements of the angular clearances of the TGB, and, depending on the findings, additional repetitive inspections measurements of the angular clearances of the TGB at a reduced interval and replacement of the TGB with a serviceable TGB. EASA AD
20210184R1 provides terminating action for the repetitive inspections at the reduced interval for a helicopter if, during two consecutive inspections, the value of the measured angular clearance remains unchanged for that helicopter.
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.
FAAs Determination These helicopters have been approved by EASA and are approved for operation
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified in EASA AD 20210184R1, described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this proposed AD.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA developed a process to use some civil aviation authority CAA
ADs as the primary source of information for compliance with requirements for corresponding FAA
ADs. The FAA has been coordinating this process with manufacturers and CAAs. As a result, the FAA proposes to incorporate EASA AD 20210184R1 by reference in the FAA final rule. This proposed AD would, therefore, require compliance with EASA AD 2021
68167
0184R1 in its entirety through that incorporation, except for any differences identified as exceptions in the regulatory text of this proposed AD.
Using common terms that are the same as the heading of a particular section in EASA AD 20210184R1 does not mean that operators need comply only with that section. For example, where the AD
requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in EASA AD 20210184R1.
Service information referenced in EASA
AD 20210184R1 for compliance will be available at https www.regulations.gov by searching for and locating Docket No.
FAA20211018 after the FAA final rule is published.
Interim Action The FAA considers this proposed AD
would be an interim action. If final action is later identified, the FAA might consider further rulemaking then.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 38
helicopters of U.S. Registry. The FAA
estimates the following costs to comply with this proposed AD:
ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Inspection of TGB Clearance
2 work-hours $85 per hour = $170 per inspection cycle.
The FAA estimates the following costs to do any necessary on-condition action that would be required based on
Parts cost
Cost per product $0
the results of any required actions. The FAA has no way of determining the
$170 per inspection cycle.
Cost on U.S. operators $6,460 per inspection cycle.
number of helicopters that might need this on-condition action:
ESTIMATED COSTS OF ON-CONDITION ACTIONS
Action
Labor cost
Replacement of TGB
lotter on DSK11XQN23PROD with PROPOSALS1
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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33 work-hours $85 per hour = $2,805.
Parts cost Up to $410,000
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
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Cost per product Up to $412,805.
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 determined that this proposed AD would not have federalism
E:FRFM01DEP1.SGM
01DEP1
