[Federal Register Volume 89, Number 218 (Tuesday, November 12, 2024)]
[Proposed Rules]
[Pages 88908-88910]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-26092]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-2423; Project Identifier AD-2024-00320-E]
RIN 2120-AA64


Airworthiness Directives; International Aero Engines AG Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain International Aero Engines (IAE AG) Model V2522-A5, V2524-
A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, 
V2531-E5, and V2533-A5 engines. This proposed AD was prompted by 
further analysis of an event involving an IAE AG Model V2533-A5 engine 
that had an uncontained failure of a high-pressure turbine (HPT) 1st-
stage hub that resulted in high-energy debris penetrating the engine 
cowling. This proposed AD would require revising the airworthiness 
limitations section (ALS) of the existing maintenance manual or 
instructions for continued airworthiness and the existing approved 
maintenance or inspection program, as applicable, to include new 
inspections of certain critical rotating parts. The FAA is proposing 
this AD to address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by December 
27, 2024.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
    <bullet> Federal eRulemaking Portal: Go to regulations.gov. Follow 
the instructions for submitting comments.
    <bullet> Fax: (202) 493-2251.
    <bullet> Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590.
    <bullet> Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2024-2423; 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: Carol Nguyen, Aviation Safety 
Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198 phone: 
(781) 238-7655; email: <a href="/cdn-cgi/l/email-protection#cba8aab9a4a7e5a5acbeb2aea58badaaaae5aca4bd"><span class="__cf_email__" data-cfemail="f49795869b98da9a93818d919ab4929595da939b82">[email protected]</span></a>.

SUPPLEMENTARY INFORMATION:

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 the ADDRESSES section. Include ``Docket No. FAA-2024-2423; 
Project

[[Page 88909]]

Identifier AD-2024-00320-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 revise 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 
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 Carol 
Nguyen, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des 
Moines, WA 98198. 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 an event involving an IAE AG Model 
V2533-A5 engine that experienced an uncontained HPT 1st-stage hub 
failure that resulted in high-energy debris penetrating the engine 
cowling. Further analysis shows that new inspections of the HPT 1st-
stage hub and HPT 2nd-stage hub should be added for certain IAE AG 
Model V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, 
V2528-D5, V2530-A5, V2531-E5, and V2533-A5 engines to prevent failure 
of the HPT 1st-stage hub and HPT 2nd-stage hub. This condition, if not 
addressed, could result in an uncontained hub failure, release of high-
energy debris, damage to the engine, damage to the airplane, and loss 
of the airplane.

FAA's 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.

Proposed AD Requirements in This NPRM

    This proposed AD would require revising the ALS of the existing 
approved engine maintenance manual or instructions for continued 
airworthiness and the existing approved maintenance or inspection 
program, as applicable, to include new inspections of the HPT 1st-stage 
hub and HPT 2nd-stage hub.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 1,514 engines installed on airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Revise the ALS........................  1 work-hour x $85 per                 $0             $85        $128,690
                                         hour = $85.
----------------------------------------------------------------------------------------------------------------

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII: Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    The FAA is issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701: General requirements. 
Under that section, Congress charges the FAA with promoting safe flight 
of civil aircraft in air commerce by prescribing regulations for 
practices, methods, and procedures the Administrator finds necessary 
for safety in air commerce. This regulation is within the scope of that 
authority because it addresses an unsafe condition that is likely to 
exist or develop on products identified in this rulemaking action.

Regulatory Findings

    The FAA determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on the States, on the relationship 
between the national government and the States, or on the distribution 
of power and responsibilities among the various levels of government.
    For the reasons discussed above, I certify this proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Would not affect intrastate aviation in Alaska, and
    (3) Would not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

International Aero Engines AG: Docket No. FAA-2024-2423; Project 
Identifier AD-2024-00320-E.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by December 27, 2024.

(b) Affected ADs

    None.

[[Page 88910]]

(c) Applicability

    This proposed AD applies to International Aero Engines (IAE AG) 
Model V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, 
V2528-D5, V2530-A5, V2531-E5, and V2533-A5 engines.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7250, Turbine Engine 
Compressor Sections.

(e) Unsafe Condition

    This AD was prompted by further analysis of an event involving 
an IAE AG model V2533-A5 engines that experienced an uncontained 
high-pressure turbine (HPT) 1st-stage hub failure that resulted in 
high-energy debris penetrating the engine cowling. The FAA is 
issuing this AD to prevent failure of the HPT 1st-stage hub and HPT 
2nd-stage hub. The unsafe condition, if not addressed, could result 
in an uncontained hub failure, release of high-energy debris, damage 
to the engine, damage to the airplane, and loss of the airplane.

(f) Compliance

    Comply with this proposed AD within the compliance times 
specified, unless already done.

(g) Required Action

    Within 90 days after the effective date of this AD; revise the 
``Maintenance Scheduling'' paragraph of the Airworthiness 
Limitations Section (ALS) of the existing approved engine 
maintenance manual (EMM) or instructions for continued airworthiness 
and your existing approved maintenance or inspection program, as 
applicable; by incorporating the information specified in table 1 to 
paragraph (g) of this AD, as applicable.

          Table 1 to Paragraph (g)--ALS Additional Inspections
------------------------------------------------------------------------
                                                    Inspection (engine
      Part nomenclature            Part No.          manual reference)
------------------------------------------------------------------------
HPT Stage 1 Hub.............  2A5001............  TASK 72-45-11-200-006.
HPT Stage 2 Hub.............  2A4802............  TASK 72-45-11-200-009.
------------------------------------------------------------------------

(h) Provisions for Alternative Actions

    After the action required by paragraph (g) of this AD has been 
done, no alternative actions are allowed unless they are approved as 
specified in the provisions of paragraph (i) of this AD.

(i) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, AIR-520 Continued Operational Safety Branch, 
FAA, has the authority to approve AMOCs for this AD, if requested 
using the procedures found in 14 CFR 39.19. In accordance with 14 
CFR 39.19, send your request to your principal inspector or local 
Flight Standards District Office, as appropriate. If sending 
information directly to the manager of the AIR-520 Continued 
Operational Safety Branch, send it to the attention of the person 
identified in paragraph (j) of this AD and email to: <a href="/cdn-cgi/l/email-protection#d99894969a99bfb8b8f7beb6af"><span class="__cf_email__" data-cfemail="5514181a16153334347b323a23">[email protected]</span></a>.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.

(j) Additional Information

    For more information about this AD, contact Carol Nguyen, 
Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, 
WA 98198; phone: (781)238-7655; email: <a href="/cdn-cgi/l/email-protection#a3c0c2d1cccf8dcdc4d6dac6cde3c5c2c28dc4ccd5"><span class="__cf_email__" data-cfemail="741715061b185a1a13010d111a341215155a131b02">[email protected]</span></a>.

(k) Material Incorporated by Reference

    None.

    Issued on November 4, 2024.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft 
Certification Service.
[FR Doc. 2024-26092 Filed 11-8-24; 8:45 am]
BILLING CODE 4910-13-P


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