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Federal Register / Vol. 86, No. 54 / Tuesday, March 23, 2021 / Proposed Rules 3 AMOCs approved for AD 790103 and AD 832003 are approved as AMOCs for the corresponding provisions of this AD.
k Related Information 1 For more information about this AD, contact Dan McCully, Aviation Safety Engineer, FAA, Atlanta ACO Branch, 1701
Columbia Avenue, College Park, GA 30337;
phone: 404 4745548; fax: 404 4745606;
email: william.mccully@faa.gov.
2 For service information identified in this AD, contact Piper Aircraft, Inc., 2926
Piper Drive, Vero Beach, FL 32960; phone:
772 5674361; website: www.piper.com.
You may view this service information at the FAA, Policy and Innovation Division, 901
Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call 816 3294148.
Issued on March 12, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202105584 Filed 32221; 8:45 am BILLING CODE 491013C

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, M
30, 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 NPRM, contact CFM International, S.A., Aviation Operations Center, 1
Neumann Way, M/D Room 285, Cincinnati, OH 45125; phone: 877
4323272; email: aviation.fleetsupport@
ge.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.

DEPARTMENT OF TRANSPORTATION

Examining the AD Docket
Federal Aviation Administration
You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210187; 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 NPRM, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Chris McGuire, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387120; fax: 781 238
7199; email: Chris.McGuire@faa.gov.
SUPPLEMENTARY INFORMATION:

14 CFR Part 39
Docket No. FAA20210187; Project Identifier AD202001664E
RIN 2120AA64

Airworthiness Directives; CFM
International, S.A. Turbofan Engines Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for certain CFM International, S.A. CFM
LEAP1A23, LEAP1A24, LEAP
1A24E1, LEAP1A26, LEAP1A26CJ, LEAP1A26E1, LEAP1A29, LEAP
1A29CJ, LEAP1A30, LEAP1A32, LEAP1A33, LEAP1A33B2, and LEAP1A35A model turbofan engines.
This proposed AD was prompted by a report of a manufacturing quality escape found during an inspection of a highpressure turbine HPT case. This proposed AD would require the removal from service of the affected HPT case.
The FAA is proposing this AD to address the unsafe condition on these products.

SUMMARY:

The FAA must receive comments on this proposed AD by May 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:
DATES:

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17:08 Mar 22, 2021

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Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210187; Project Identifier AD
202001664E 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 proposal 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

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www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.
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 NPRM
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 NPRM, 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 NPRM. Submissions containing CBI
should be sent to Chris McGuire, 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.
Background The FAA received a report of a manufacturing quality escape that identified certain HPT cases did not meet their approved type design. CFM
determined the nonconforming parts could lead to over-temperature of the HPT mid-seal and uncontained rotor failure. A review of several x-rays of the bleed ports of the HPT case showed 148
parts with nonconforming indications, 8
of which were significant enough to impact the life of the HPT case. This condition, if not addressed, could result in failure of the HPT case, uncontained rotor release, damage to the engine, and damage to the airplane.
FAAs Determination The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed CFM Service Bulletin SB LEAP1A72000421
01A930AD, Issue 001, dated October 22, 2020. This SB specifies procedures for replacing the affected HPT cases.
This service information is reasonably available because the interested parties
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