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42690

Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Rules and Regulations was prompted by reports of missing or disbonded pressure seals on two TR
translating cowls. The NPRM proposed to require a one-time inspection of each TR for damage, seal bonding rework, and replacement of translating cowl pressure seals if necessary, as specified in EASA AD 20210035.
The FAA is issuing this AD to address missing or disbonded TR translating cowl seal segments. In a case where all seal segments were missing, this condition, if not addressed, could lead to loss of thrust at maximum continuous thrust or at takeoff/go-around, possibly resulting in substantially reduced performance of the airplane. See the MCAI for additional background information.

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 20210035, dated January 25, 2021 EASA AD
20210035 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus SAS
Model A330841 and 941 airplanes.
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
841 and 941 airplanes. The NPRM
published in the Federal Register on May 10, 2021 86 FR 24790. The NPRM

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 20210035 describes procedures for inspecting each TR for damage including tears, cracks, unwanted sealant on the contact surface, missing pieces, worn-out seals, or glass or ceramic ply that is not impacted, reworking the pressure seal bonding, and replacing damaged translating cowl pressure seals.
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 8 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
7 work-hours $85 per hour = $595 per thrust reverser

$0

$595

$4,760

The FAA estimates the following costs to do any necessary on-condition action 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:

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ESTIMATED COSTS OF ON-CONDITION ACTION
Labor cost
Parts cost
Cost per product
22 work-hours $85 per hour = $1,870 per thrust reverser

$42,268

$44,138

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 the 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:

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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
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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 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.

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