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Federal Register / Vol. 86, No. 3 / Wednesday, January 6, 2021 / Rules and Regulations searching for and locating Docket No.
FAA20201168; 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 street address for the Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Nicholas Paine, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387116; fax: 781 238
7199; email: nicholas.j.paine@faa.gov.
SUPPLEMENTARY INFORMATION:
Background On March 18, 2020, an Airbus Model A321231 airplane, powered by IAE
V2533A5 model turbofan engines, experienced an uncontained HPT 1ststage disk failure that resulted in highenergy debris penetrating the engine cowling. Based on a preliminary analysis of this event, on March 21, 2020, the FAA issued Emergency AD
20200751, which requires the removal from service of certain HPT 1ststage disks installed on IAE V2522A5, V2524A5, V2525D5, V2527A5, V2527EA5, V2527MA5, V2528D5, V2530A5, and V2533A5 model turbofan engines.
Since the FAA issued AD 202007
51, the manufacturer conducted a root cause analysis and identified a different population of HPT 1st-stage and HPT
2nd-stage disks that are affected by the unsafe condition and require removal from service. This condition, if not addressed, could result in failure of the HPT, uncontained HPT failure, damage to the engine, damage to the airplane, and loss of the airplane. The FAA is issuing this AD to address the unsafe condition on these products.

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FAAs Determination The FAA is issuing this AD because the agency has determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
AD Requirements This AD requires the removal from service of certain HPT 1st-stage and HPT 2nd-stage disks installed on IAE
V2500A1, V2522A5, V2524A5, V2525D5, V2527A5, V2527EA5, V2527MA5, V2528D5, V2530A5, V2531E5, and V2533A5 model turbofan engines.
Interim Action The design approval holder is currently developing a modification to address the unsafe condition identified in this AD. Once this modification is
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developed, the FAA might consider additional rulemaking.
Justification for Immediate Adoption and Determination of the Effective Date Section 553b3B of the Administrative Procedure Act APA 5
U.S.C. 551 et seq. authorizes agencies to dispense with notice and comment procedures for rules when the agency, for good cause, finds that those procedures are impracticable, unnecessary, or contrary to the public interest. Under this section, an agency, upon finding good cause, may issue a final rule without providing notice and seeking comment prior to issuance.
Further, section 553d of the APA
authorizes agencies to make rules effective in less than thirty days, upon a finding of good cause.
An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption.
The FAA has found that the risk to the flying public justifies foregoing notice and comment prior to adoption of this rule. On March 18, 2020, an Airbus Model A321231 airplane, powered by IAE V2533A5 model turbofan engines, experienced an uncontained HPT 1ststage disk failure that resulted in an aborted takeoff. The uncontained failure of the HPT 1st-stage disk resulted in high-energy debris penetrating the engine cowling. The FAA published Emergency AD EAD 20200751 on March 21, 2020 followed by publication in the Federal Register on April 13, 2020, as a Final Rule, Request for Comments 85 FR 20402, to remove from service HPT 1st-stage disks identified as having the highest risk of failure. Based on the root cause analysis performed since that event, the manufacturer has identified a different population of affected HPT 1st-stage and HPT 2nd-stage disks that are affected by the same unsafe condition and require removal from service. These HPT disks have the highest risk of failure and require removal within 50 flight cycles or 30 days after the effective date of this AD, whichever comes first, to prevent additional HPT disk failures and maintain an acceptable level of safety.
This unsafe condition may result in loss of the airplane.
The FAA considers removal of certain HPT 1st-stage and HPT 2nd-stage disks to be an urgent safety issue.
Accordingly, notice and opportunity for prior public comment are impracticable and contrary to the public interest pursuant to 5 U.S.C. 553b3B. In addition, the FAA finds that good cause exists pursuant to 5 U.S.C. 553d for making this amendment effective in less
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than 30 days, for the same reasons the FAA found good cause to forego notice and comment.
Comments Invited The FAA invites you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under ADDRESSES.
Include the docket number FAA2020
1168 and Project Identifier AD2020
01568E at the beginning of your comments. The most helpful comments reference a specific portion of the final rule, 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 this final rule 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 final rule.
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 AD 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 AD, 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 AD. Submissions containing CBI
should be sent to Nicholas Paine, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Regulatory Flexibility Act The requirements of the Regulatory Flexibility Act RFA do not apply when an agency finds good cause pursuant to 5 U.S.C. 553 to adopt a rule without prior notice and comment. Because FAA
has determined that it has good cause to adopt this rule without prior notice and comment, RFA analysis is not required.

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