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Federal Register / Vol. 86, No. 137 / Wednesday, July 21, 2021 / Rules and Regulations
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210544; Project Identifier AD202100642E; Amendment 3921646; AD 20211419
RIN 2120AA64

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

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Examining the AD Docket
The FAA is adopting a new airworthiness directive AD for certain International Aero Engines AG IAE
V2500 model turbofan engines. This AD
was prompted by a review of investigative findings from an event involving an uncontained failure of a high-pressure turbine HPT 1st-stage disk that resulted in high-energy debris penetrating the engine cowling. This AD
requires performance of an ultrasonic inspection USI of the HPT 1st-stage disk and HPT 2nd-stage disk and, depending on the results of the inspections, replacement of the HPT 1ststage disk or HPT 2nd-stage disk with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 5, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of August 5, 2021.
The Director of the Federal Register approved the incorporation by reference of certain other publications listed in this AD as of July 13, 2021 86 FR
30380, June 8, 2021.
The FAA must receive comments on this AD by September 7, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this final rule, contact International SUMMARY:

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Aero Engines AG, 400 Main Street, East Hartford, CT 06118; phone: 800 565
0140; email: help24@pw.utc.com;
website: http fleetcare.pw.utc.com.
You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA
01803. For information on the availability of this material at the FAA, call 781 2387759. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210544.
You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210544; 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:
Alberto Hernandez, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387329; fax: 781 238
7199; email: Alberto.J.Hernandez@
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 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 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 and AD 20210103 on January 6, 2021 86 FR 458 to remove from service HPT 1st-stage and HPT
2nd-stage disks identified as having the highest risk of failure.
Based on the root cause analysis performed since that event, the manufacturer identified a population of HPT 1st-stage disks and HPT 2nd-stage disks that require inspection and possible removal from service. In response, the FAA published AD 2021
1115 on June 8, 2021 86 FR 30380 to require performance of a USI on affected HPT 1st-stage disks and HPT 2nd-stage disks and, depending on the results of the USI, removal of the affected HPT
disks from service. Compliance time for performance of the USI in AD 202111

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15 is based on the specific IAE V2500
model turbofan engine on which the HPT 1st-stage or 2nd-stage disk is installed and is required to be performed at the next engine shop visit or between 3,2006,700 flight cycles FCs, depending on the model turbofan engine, after the effective date of the AD, whichever occurs first.
Based on the review of investigative findings from this March 2020 event, the manufacturer identified a high-risk subpopulation of parts that require urgent inspection. The FAA, therefore, published Emergency AD 20211151
on May 21, 2021 followed by publication in the Federal Register on July 2, 2021, as a Final Rule, Request for Comments 86 FR 35217 requiring performance of a USI within 10 FCs on the highest-risk HPT 1st-stage disks and HPT 2nd-stage disks and, depending on the results of the USI, removal of the affected HPT disks from service. The FAA is now publishing this AD to require performance of a USI on the remaining high-risk subpopulation of affected HPT 1st-stage disks and HPT
2nd-stage disks and, depending on the results of the USI, removal of the affected HPT disks from service.
Compliance time is between 100 and 620 FCs after the effective date of this AD and is based on the specific V2500
IAE turbofan engine model on which the affected disks are, or have been, installed.
This condition, if not addressed, could result in uncontained HPT disk 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.
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.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Pratt & Whitney P&W Special Instruction SI No.
112F21, dated May 24, 2021. The SI
identifies the affected HPT 1st-stage disks and HPT 2nd-stage disks installed on IAE V2522A5, V2524A5, V2525
D5, V2527A5, V2527EA5, V2527M
A5, V2528D5, V2530A5, and V2533
A5 model turbofan engines.
The FAA reviewed P&W SI No. 114F
21, dated May 24, 2021. The SI
identifies the affected HPT 2nd-stage disks installed on IAE V2531E5 model turbofan engines.
The FAA reviewed IAE NMSB No.
V2500ENG720713, Revision 1, dated
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