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Federal Register / Vol. 86, No. 108 / Tuesday, June 8, 2021 / Rules and Regulations
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210129; Project Identifier AD202001597E; Amendment 3921577; AD 20211115
RIN 2120AA64

Airworthiness Directives; International Aero Engines AG Turbofan Engines Federal Aviation Administration FAA, DOT.
ACTION: Final rule.

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AGENCY:

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:
Nicholas Paine, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387742; fax: 781 238
7199; email: nicholas.j.paine@faa.gov.
SUPPLEMENTARY INFORMATION:

Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
SUMMARY: The FAA is adopting a new part 39 by adding an AD that would airworthiness directive AD for certain apply to certain IAE V2522A5, V2524
International Aero Engines AG IAE
A5, V2525D5, V2527A5, V2527EA5, V2500 model turbofan engines. This AD V2527MA5, V2528D5, V2530A5, was prompted by an analysis performed V2531E5, and V2533A5 model by the manufacturer after an event turbofan engines. The NPRM published involving an uncontained failure of a in the Federal Register on March 8, high-pressure turbine HPT 1st-stage 2021 86 FR 13225. The NPRM was disk that resulted in high-energy debris prompted by an event involving an penetrating the engine cowling. This AD uncontained failure of an HPT 1st-stage requires the performance of an disk that resulted in high-energy debris ultrasonic inspection USI of the HPT
penetrating the engine cowling. On 1st-stage disk and HPT 2nd-stage disk March 18, 2020, an Airbus Model A321
and, depending on the results of the 231 airplane, powered by IAE V2533
inspections, replacement of the HPT 1stA5 model turbofan engines, experienced stage disk or HPT 2nd-stage disk. The an uncontained HPT 1st-stage disk FAA is issuing this AD to address the failure that resulted in an aborted unsafe condition on these products.
takeoff. The uncontained failure of the HPT 1st-stage disk resulted in highDATES: This AD is effective July 13, energy debris penetrating the engine 2021.
cowling. The FAA published Emergency The Director of the Federal Register approved the incorporation by reference AD 20200751 on March 21, 2020
followed by publication in the Federal of certain publications listed in this AD
Register on April 13, 2020, as a Final as of July 13, 2021.
Rule, Request for Comments 85 FR
ADDRESSES: For service information 20402 and AD 20210103 on January identified in this final rule, contact 6, 2021 86 FR 458, to remove from International Aero Engines AG, 400
service HPT 1st-stage and HPT 2ndMain Street, East Hartford, CT 06118;
stage disks identified as having the phone: 800 5650140; email: help24@
highest risk of failure. Based on the root pw.utc.com; website: http
fleetcare.pw.utc.com. You may view this cause analysis performed since that event, the manufacturer identified a service information at the FAA, population of HPT 1st-stage disks and Airworthiness Products Section, Operational Safety Branch, 1200 District HPT 2nd-stage disks that require inspection and possible removal from Avenue, Burlington, MA 01803. For service. In the NPRM, the FAA
information on the availability of this proposed to require the performance of material at the FAA, call 781 238
a USI of the HPT 1st-stage disk and HPT
7759. It is also available at https
2nd-stage disk and, depending on the www.regulations.gov by searching for results of the inspections, replacement and locating Docket No. FAA2021
of the HPT 1st-stage disk or HPT 2nd0129.
stage disk. The FAA is issuing this AD
Examining the AD Docket to address the unsafe condition on these products.
You may examine the AD docket at https www.regulations.gov by Discussion of Final Airworthiness searching for and locating Docket No.
Directive FAA20210129; or in person at Docket Comments Operations between 9 a.m. and 5 p.m., The FAA received comments from Monday through Friday, except Federal three commenters. The commenters holidays. The AD docket contains this were Cathay Pacific Airways Cathay, final rule, any comments received, and
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IAE, and an individual commenter. One commenter requested clarification on the compliance time for inspection.
Another commenter requested clarification regarding additional inspections that are needed when parts are removed for piece part inspections.
One commenter requested clarification regarding the definition of a part eligible for installation as well as the installation prohibition. An individual commenter supported the proposal without change. The following presents the comments received on the NPRM
and the FAAs response to each comment.
Request To Clarify USI Interval for Different Thrust Ratings Cathay asked for clarification of the interval for performing the USI for any HPT 1st-stage disk or HPT 2nd-stage disk that has operated in different thrust ratings, such as from 27K to 33K, or 33K
to 27K. Cathay reasoned that during the IAE V2500 Customer Council Call in December 2020, IAE used thrust ratings to indicate when to perform the inspections of the HPT 1st-stage disk or HPT 2nd-stage disk.
The FAA reviewed IAE NonModification Service Bulletin NMSB
No. V2500ENG720713, Revision 1, dated January 26, 2021 IAE NMSB
V2500ENG720713, Revision 1. This revised NMSB was published after the IAE V2500 Customer Council Call in December 2020. The revised NMSB
removed references to thrust ratings in the Compliance section. Therefore, this AD does not distinguish inspection intervals based on thrust ratings.
Request To Clarify Piece-Part Opportunity Inspection Requirements IAE requested clarification on whether an HPT 1st-stage disk and HPT
2nd-stage disk with fewer than 100
flight cycles FCs since the last piecepart fluorescent penetrant inspection FPI need to undergo another FPI if the same parts were removed for the piecepart opportunity USI in accordance with IAE NMSB V2500ENG720713, Revision 1. IAE reasoned that the V2500
Maintenance Scheduling section of the Airworthiness Limitations Section ALS requires an FPI at each piece-part opportunity.
The FAA clarifies that when an HPT
1st-stage disk or an HPT 2nd-stage disk is removed for piece-part inspection, the ALS of the manufacturers Instructions for Continued Airworthiness may require additional inspections not required by this AD. The FAA refers the commenter to the ALS, which indicates that additional inspections are not required unless the part has more than
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