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Federal Register / Vol. 86, No. 137 / Wednesday, July 21, 2021 / Rules and Regulations January 26, 2021. The NMSB specifies procedures for a USI of the HPT 1ststage disk and HPT 2nd-stage disk.
The FAA reviewed IAE NMSB No.
V2500E5720015, dated December 15, 2020. The NMSB specifies procedures for a USI of the HPT 1ststage disk and HPT 2nd-stage disk.
The Director of the Federal Register approved IAE NMSB V2500ENG72
0713, Revision 1, dated January 26, 2021
and IAE NMSB V2500E5720015, dated December 15, 2020, for incorporation by reference as of July 13, 2021 86 FR 30380, June 8, 2021. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in ADDRESSES.
AD Requirements This AD requires the performance of a USI of the HPT 1st-stage disk and HPT
2nd-stage disk and, depending on the results of the inspections, replacement of the HPT 1st-stage disk or HPT 2ndstage disk with a part eligible for installation.
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. Based on a review of investigative findings performed since that event, the manufacturer has identified a high-risk population of affected HPT 1st-stage and HPT 2ndstage disks that are affected by the same unsafe condition and require USI and, depending on the results of the USI, removal from service.
The FAA considers the risk of an uncontained HPT disk failure to be an urgent safety issue. USI of the HPT 1ststage and 2nd-stage disks must be accomplished between 100 FCs and 620
FCs after the effective date of this AD to prevent additional HPT disk failures and maintain an acceptable level of safety. This unsafe condition, caused by an uncontained HPT 1st-stage disk and HPT 2nd-stage disk failure, may result in damage to the engine, damage to the airplane, and loss of the airplane.
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 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 Docket No. FAA20210544
and Project Identifier AD202100642
E 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.

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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 Alberto Hernandez, 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.
Costs of Compliance The FAA estimates that this AD
affects 112 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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ESTIMATED COSTS
Action
Labor cost
Ultrasonic inspection includes actions necessary to disassemble the engine.

204 work-hours $85 per hour = $17,340

The FAA estimates the following costs to do any necessary replacement
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that would be required based on the results of the inspection. The agency has
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Cost per product
Parts cost $0

$17,340

Cost on U.S.
operators $1,942,080

no way of determining the number of
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