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Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Rules and Regulations
prompted by reports of incorrect installation of the lower attachment parts of the trimmable horizontal stabilizer actuator THSA. This AD
requires doing a detailed inspection of the THSA lower attachment parts for discrepancies and corrective action if necessary, and prohibits using earlier versions of certain airplane maintenance manual AMM tasks, as specified in a European Union Aviation Safety Agency EASA AD, which is incorporated by reference. The FAA is issuing this AD
to address the unsafe condition on these products.
DATES: This AD is effective September 9, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of September 9, 2021.
ADDRESSES: For material incorporated by reference IBR in this AD, contact EASA, Konrad-Adenauer-Ufer 3, 50668
Cologne, Germany; telephone +49 221
8999 000; email ADs@easa.europa.eu;
internet www.easa.europa.eu. You may find this IBR material on the EASA
website at https ad.easa.europa.eu.
You may view this IBR material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
It is also available in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0371.
Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0371; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of
Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Vladimir Ulyanov, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax: 2062313229; email vladimir.ulyanov@faa.gov.
SUPPLEMENTARY INFORMATION:
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20210033, dated January 25, 2021 EASA AD
20210033 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus SAS
Model A330200, 200 Freighter, 300, 800, and 900 series airplanes; and Model A340200 and 300 series airplanes. Model A330743L airplanes are not certificated by the FAA and are not included on the U.S. type certificate data sheet; this AD therefore does not include those airplanes in the applicability.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all Airbus SAS Model A330
200, 200 Freighter, 300, 800, and 900 series airplanes; and Model A340
200 and 300 series airplanes. The NPRM published in the Federal Register on May 18, 2021 86 FR 26855.
The NPRM was prompted by reports of incorrect installation of the lower attachment parts of the THSA. The NPRM proposed to require doing a detailed inspection of the THSA lower attachment parts for discrepancies and corrective action if necessary, and to prohibit using earlier versions of certain AMM tasks, as specified in EASA AD
20210033.
Comments The FAA gave the public the opportunity to participate in developing
this final rule. The FAA has considered the comment received. The Air Line Pilots Association, International ALPA
indicated its support for the NPRM.
Conclusion The FAA reviewed the relevant data, considered the comment received, and determined that air safety and the public interest require adopting this final rule as proposed, except for minor 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.
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, 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.
Costs of Compliance The FAA estimates that this AD
affects 120 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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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
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the results of any required actions. The FAA has no way of determining the
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number of aircraft that might need these on-condition actions:

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