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Federal Register / Vol. 86, No. 111 / Friday, June 11, 2021 / Rules and Regulations manufacturer determined the fan blades experienced cracks that originated on the internal surface of the convex airfoil and propagated to the point of failure.
The cracks originated in a microtexture area that can result in a low-cycle fatigue debit that may allow a crack to initiate and propagate to failure. The FAA issued AD 20192513 to prevent failure of the fan blade.
Actions Since AD 20192513 Was Issued Since the FAA issued AD 201925
13, the manufacturer performed analysis of a fractured LPC 1st-stage fan blade and determined the fracture resulted from a fatigue crack. The manufacturer determined that repetitive ultrasonic inspection for cracks on the LPC 1ststage fan blade convex airfoil is necessary to decrease the risk of fracture event. As a result of this analysis, the manufacturer published EA Alert Service Bulletin SB EAGP7A72444, dated November 18, 2020. This service information specifies lower initial inspection thresholds for performing ultrasonic inspections of affected LPC
1st-stage fan blades and contains procedures for performing repetitive ultrasonic inspections of affected LPC
1st-stage fan blades. The FAA is issuing this AD to address the unsafe condition on these products.
FAAs Determination The FAA is issuing this AD because the agency determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed EA Alert SB
EAGP7A72444, dated November 18, 2020. The Alert SB describes the inspection thresholds and procedures for performing an ultrasonic inspection of the LPC 1st-stage fan blades. 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 initial and repetitive ultrasonic inspections of the affected LPC 1st-stage fan blades and replacement of any LPC 1st-stage fan blade that fails the inspection.
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.
The FAA has found the risk to the flying public justifies waiving notice and comment prior to adoption of this rule because no domestic operators use this product. It is unlikely that the FAA
will receive any adverse comments or useful information about this AD from any U.S. operator. Accordingly, notice and opportunity for prior public comment are unnecessary, pursuant to 5
U.S.C. 553b3B. In addition, for the foregoing reason, the FAA finds that good cause exists pursuant to 5 U.S.C.
553d for making this amendment effective in less than 30 days.
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. FAA20210445
and Project Identifier AD202100268
E 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 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 Stephen Elwin, 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 0 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
Perform ultrasonic inspection for one set of 1ststage LPC blades.

8 work-hours $85 per hour = $680

The FAA estimates the following costs to do any necessary replacements
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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

Cost on U.S.
operators
$680

no way of determining the number of
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$0