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Federal Register / Vol. 86, No. 94 / Tuesday, May 18, 2021 / Proposed Rules
include those airplanes in the applicability.
This proposed AD was prompted by reports of incorrect installation of the lower attachment parts of the THSA.
The FAA is proposing this AD to address incorrect installation of the THSA lower attachment parts, which could lead to the loss of THSA primary load path and consequent activation of THSA secondary load path which is designed to withstand full loads only for a limited period of time, and possibly result in reduced controllability of the airplane. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20210033 describes procedures for doing a detailed inspection of the THSA lower attachment parts for discrepancies i.e., incorrect installation and corrective actions which includes detailed inspections of the horizontal stabilizer, the assembly of the trim actuating arms, the support fittings, and the upper and lower attachment plates for any cracks, dents and scratches, corrosion, deterioration of the structure, and the condition of the fasteners and bearings, and repair; and re-installing or replacing the THSA lower attachment parts if necessary. EASA AD 20210033 also prohibits using earlier versions of certain AMM tasks. 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 and Requirements of This Proposed AD
This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI referenced above. The FAA is proposing this AD
because the FAA evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Proposed AD Requirements This proposed AD would require accomplishing the actions specified in EASA AD 20210033 described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this AD.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance
with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA AD
20210033 will be incorporated by reference in the FAA final rule. This proposed AD would, therefore, require compliance with EASA AD 20210033
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 the EASA AD 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 the EASA AD. Service information specified in EASA AD
20210033 that is required for compliance with EASA AD 20210033
will be available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210371 after the FAA final rule is published.
Costs of Compliance The FAA estimates that this proposed AD affects 120 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
2 work-hours $85 per hour = $170

$0

$170

$20,400

The FAA estimates the following costs to do any necessary on-condition actions that would be required based on
the results of any required actions. The FAA has no way of determining the
number of aircraft that might need these on-condition actions:

ESTIMATED COSTS OF ON-CONDITION ACTIONS
Labor cost
Parts cost
Cost per product
25 work-hours $85 per hour = $2,125

$821,060

$823,185

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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
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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.

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