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Federal Register / Vol. 86, No. 154 / Friday, August 13, 2021 / Proposed Rules
www.regulations.gov by searching for and locating Docket No. FAA2021
0663; 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 NPRM, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Sanjay Ralhan, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax 2062313223; email sanjay.ralhan@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210663; Project Identifier MCAI202001618T at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this proposed AD.

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Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI

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should be sent to Sanjay Ralhan, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198; telephone and fax 2062313223; email sanjay.ralhan@
faa.gov. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA issued AD 20161712, Amendment 3918625 81 FR 58823, August 26, 2016 AD 20161712, for all Airbus SAS Model A318 series airplanes; Model A319111, 112, 113, 114, 115, 131, 132, and 133
airplanes; Model A320211, 212, 214, 231, 232, and 233 airplanes; and Model A321111, 112, 131, 211, 212, 213, 231, and 232 airplanes.
AD 20161712 requires inspecting certain THSAs to determine the number of total flight cycles the THSA has accumulated, and replacing the THSA if necessary. The FAA issued AD 2016
1712 to address premature wear of the carbon friction disks on the no-back brake NBB of the THSA, which could lead to reduced braking efficiency in certain load conditions, and, in conjunction with the inability of the power gear train to keep the ball screw in its last commanded position, could result in uncommanded movements of the trimmable horizontal stabilizer and loss of control of the airplane.
Actions Since AD 20161712 Was Issued Since the FAA issued AD 201617
12, new investigations determined that the compliance time for removal from service and replacement of certain THSA NBB disks must be reduced. This task was required by AD 20161712, and the task and newly reduced compliance time have now been incorporated into Airbus A318/A319/
A320/A321 Airworthiness Limitations Section ALS Part 4 Variation 7.1, dated October 5, 2020. The FAA has therefore determined that new or more restrictive airworthiness limitations are necessary.
EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20200270, dated December 7, 2020 EASA AD
20200270 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus SAS
Model A318111, 112, 121, and 122
airplanes; Model A319111, 112, 113, 114, 115, 131, 132, 133, 151N, 153N, and 171N airplanes; Model A320211, 212, 214, 216, 231, 232, 233, 251N, 252N, 253N,
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271N, 272N, and 273N airplanes;
and Model A321111, 112, 131, 211, 212, 213, 231, 232, 251N, 251NX, 252N, 252NX, 253N, 253NX, 271N, 271NX, 272N, and 272NX
airplanes. Model A320215 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.
Airplanes with an original airworthiness certificate or original export certificate of airworthiness issued after October 5, 2020, must comply with the airworthiness limitations specified as part of the approved type design and referenced on the type certificate data sheet. However, Airbus A318/A319/A320/A321
Airworthiness Limitations Section ALS Part 4 Variation 7.1 specifies that replacements can be accomplished in accordance with certain service information, while this proposed AD
would require accomplishing those replacements in accordance with certain service information. To ensure all maintenance or inspection programs incorporate the revised task, including the revised replacement requirements, this proposed AD would therefore require all operators to revise their existing maintenance or inspection program to include either the revised task including the revised provisions for replacement, or the revised provisions for replacement, depending on when the original airworthiness certificate or original export certificate of airworthiness was issued.
EASA AD 20200270 specifies that it requires a task limitation already required by EASA AD 20200034, dated February 25, 2020 which corresponds to FAA AD 20202110, Amendment 3921283 85 FR 65190, October 15, 2020 AD 20202110 and invalidates terminates prior instructions for that task. This proposed AD would terminate the ALS limitation for task 274000
000041E for the THSAs, as required by paragraph i of AD 20202110, for Model A318111, 112, 121, and 122
airplanes; Model A319111, 112, 113, 114, 115, 131, 132, 133, 151N, and 153N airplanes; Model A320211, 212, 214, 216, 231, 232, 233, 251N, 252N, 253N, 271N, 272N, and 273N airplanes; and Model A321
111, 112, 131, 211, 212, 213, 231, 232, 251N, 251NX, 252N, 252NX, 253N, 253NX, 271N, 271NX, 272N, and 272NX airplanes; with an original airworthiness certificate or original export certificate of airworthiness issued on or before November 7, 2019, only.

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