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Federal Register / Vol. 86, No. 34 / Tuesday, February 23, 2021 / Rules and Regulations ACTION:

Final rule.

The FAA is adopting a new airworthiness directive AD for all Airbus SAS Model A350941 and 1041
airplanes. This AD was prompted by a report that certain retaining rings could cause damage to frame forks, brackets and edge frames, and their surface protection; subsequent investigation showed that the depth of the frame fork spotfacing on structural parts is inadequate to accommodate the retaining ring. This AD requires repetitive inspections of certain areas of each cargo door for damage and corrective action. This AD also provides an optional terminating modification, 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 March 30, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of March 30, 2021.
ADDRESSES: For material incorporated by reference IBR in this AD, contact the 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. FAA2020
0969.
SUMMARY:

Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for
10773

The FAA is issuing this AD to address inadequate frame fork spotfacing depth for the retaining rings, which could reduce the structural integrity of the airplane. See the MCAI for additional background information.

and locating Docket No. FAA2020
0969; 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, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Kathleen Arrigotti, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax 2062313218; email kathleen.arrigotti@faa.gov.
SUPPLEMENTARY INFORMATION:

Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.
Conclusion The FAA reviewed the relevant data 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.

Discussion The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20200144, dated June 29, 2020 EASA
AD 20200144 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus SAS
Model A350941 and 1041 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 A350
941 and 1041 airplanes. The NPRM
published in the Federal Register on October 26, 2020 85 FR 67696. The NPRM was prompted by a report that certain retaining rings could cause damage to frame forks, brackets and edge frames, and their surface protection; subsequent investigation showed that the depth of the frame fork spotfacing on structural parts is inadequate to accommodate the retaining ring. The NPRM proposed to require repetitive inspections of certain areas of each cargo door for damage and corrective action. The NPRM also proposed to provide an optional terminating modification, as specified in an EASA AD.

Related Service Information Under 1
CFR Part 51
EASA AD 20200144 describes procedures for repetitive inspections of the edge frames, brackets, frame forks, and the access cover on the internal side of each cargo door for damage including cracks and corrosion and corrective actions. Corrective actions include repair or rework. EASA AD
20200144 also describes procedures for an optional modification of each affected cargo door, which terminates the repetitive inspections. 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 13 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
24 work-hours $85 per hour = $2,040

$0

$2,040

$26,520

ESTIMATED COSTS FOR OPTIONAL ACTIONS
Labor cost
Parts cost
9 work-hours $85 per hour = $765

Up to $8,570

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Cost per product Up to $9,335.