Rule2025-17066
Airworthiness Directives; International Aero Engines AG Engines
Primary source
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Published
September 5, 2025
Effective
October 10, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain International Aero Engines AG (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 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 AD requires 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 issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 90 Issue 170 (Friday, September 5, 2025)</title>
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[Federal Register Volume 90, Number 170 (Friday, September 5, 2025)]
[Rules and Regulations]
[Pages 42805-42807]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-17066]
[[Page 42805]]
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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;
Amendment 39-23126; AD 2025-17-16]
RIN 2120-AA64
Airworthiness Directives; International Aero Engines AG Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain International Aero Engines AG (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 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 AD requires 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 issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective October 10, 2025.
ADDRESSES: AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a>
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 final rule, any comments
received, and other information. The address for Docket Operations is
U.S. Department of Transportation, Docket Operations, M-30, West
Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE,
Washington, DC 20590.
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#fe9d9f8c9192d090998b879b90be989f9fd0999188"><span class="__cf_email__" data-cfemail="234042514c4f0d4d44565a464d634542420d444c55">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to 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. The NPRM was published in the
Federal Register on November 12, 2024 (89 FR 88908). The NPRM was
prompted by further analysis of an event involving an IAE AG Model
V2533-A5 engine that had an uncontained failure of an HPT 1st-stage hub
that resulted in high-energy debris penetrating the engine cowling. In
the NPRM, the FAA proposed to require revising the 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 the HPT 1st-stage hub and HPT 2nd-stage hub.
The FAA is issuing this AD to address the unsafe condition on these
products.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from seven commenters. The commenters
were the Air Line Pilots Association, International (ALPA); JetBlue
Airways (JetBlue); Lufthansa Technik AG (Lufthansa); Ryanair; SIA
Engineering Company (SIAEC); United Airlines (UAL); and an anonymous
commenter. ALPA supported the proposed AD without change. The following
presents the comments received on the NPRM and the FAA's response to
each comment.
Request To Update Task Reference
JetBlue, Lufthansa, Ryanair, SIAEC, UAL, and an anonymous commenter
requested that the FAA change one of the tasks in the ``Inspection
(Engine Manual Reference)'' column in table 1 to paragraph (g) of the
proposed AD from ``Task 72-45-11-200-009'' to ``Task 72-45-31-200-
009.'' UAL, JetBlue, and Ryanair noted that Task 72-45-11-200-009 does
not exist in the engine manual.
The FAA agrees and has updated the language in table 1 to paragraph
(g) of this AD as requested.
Request To Update Paragraph (g) of the Proposed AD
An anonymous commenter requested that the FAA update paragraph (g)
of the proposed AD to read as follows; ``Revise the Maintenance
Scheduling Section (MSS) of the Time Limits Manuals (TLM): T-V2500-1IA
Task 05-10-00-990-000-B00 (A5), T-V2500-3IA Task 05-10-00-990-000 (D5),
and T-V2500-[???] Task 05-10-00-990-000(?) (E5), and for air carrier
operations revise the approved continuous airworthiness maintenance
program; by incorporating the information specified in table 1 to
paragraph (g) of this AD, as applicable.'' The anonymous commenter
noted that the use of the word ``your'' to describe the existing
approved maintenance or inspection program is not clear and the
statement should be changed to clarify that the action relates to each
FAA certificated air carrier.
The FAA partially agrees. The FAA does not agree with the wording
proposed by the anonymous commenter because not all operators use the
term ``continuous airworthiness maintenance program.'' The FAA agrees
to meet the commenter's intent in paragraph (g)(1) and (2) of this AD
by updating those paragraphs as set forth in the AD section of this
rule.
Request To Clarify Responsibility for Required Actions
Lufthansa requested that the FAA reword paragraph (g) of the
proposed AD to ensure that parts are inspected during each qualifying
shop visit directly after the effective date of the proposed AD and to
clarify which requirements are to be done by the repair shops and which
must be done on-wing by the air carriers.
The FAA agrees and has updated the language in paragraph (g) of
this AD to specify required actions for air carrier operations and to
clarify that TASK 72-45-11-200-006 and TASK 72-45-31-200-009 are
located in paragraph B.1 of the Maintenance Scheduling section of the
applicable TLM, which is done at piece-part exposure.
Request To Clarify Inspection Task Requirement
An anonymous commenter requested that the FAA clarify that the
performance of each inspection task is not directly required by the
proposed AD, and that the only required actions are the one time update
to the (FAA Approved) Maintenance Scheduling sections for the V2500-A5,
V2500-D5, and V2500-D5 TLM, and the one time update to each FAA
Certificated Air Carrier's Continuous Airworthiness Maintenance
Program.
The FAA agrees to clarify. This AD requires an update to the
operator's ICA, which includes the Engine Maintenance Manual (EMM). The
operator's EMM will need to be updated to include TASK 72-45-11-200-006
and TASK 72-45-31-200-009 in the TLM in order to comply with this AD.
For some operators, this would be considered their Continuous
Airworthiness Maintenance Program. The performance of these tasks is
required by other FAA regulations that are then required upon
compliance with this AD. The FAA did
[[Page 42806]]
not change this AD as a result of this comment.
Request To Clarify Responsibility for EMM Revision
SIAEC requested that the FAA update paragraph (g) of this AD to
clarify who is responsible for revising the EMM. SIAEC notes that the
proposed AD requires a revision to the Maintenance Scheduling paragraph
of the ALS of the existing approved EMM, but an operator is unable to
revise the EMM because it is the responsibility of the original
equipment manufacturer (OEM).
The FAA disagrees that the revision to the EMM is solely the
responsibility of the OEM because an operator may not be required to
have the latest version of the OEM's EMM incorporated into their ICA.
This AD requires the operator to include the latest two inspection
tasks into the operator's EMM regardless of what version of the EMM
they are currently required to have. The operator will then update
their existing approved maintenance or inspection program, as
applicable. The FAA did not change this AD as a result of this comment.
Request To Refer to the ALS of the Approved TLM
Lufthansa requested that the FAA refer to the ALS of the approved
TLM in the proposed AD instead of the ALS of the approved EMM.
The FAA agrees and has updated the language in paragraph (g)(1) of
this AD as requested.
Request To Clarify Compliance With AD Requirements
SIAEC requested that the FAA clarify whether the incorporation of
TASK 72-45-11-200-006 and TASK 72-45-31-200-009 into the EMM
constitutes compliance with the requirement of the proposed AD and no
further action is required.
The FAA agrees to clarify. The incorporation of TASK 72-45-11-200-
006 and TASK 72-45-31-200-009 into the EMM only constitutes compliance
with the requirements of this AD for those that do not by regulation
have an existing approved maintenance or inspection program. For
operators that do have such program, there is an additional requirement
for operators to make changes to their existing approved maintenance or
inspection program. The FAA did not change this AD as a result of this
comment.
Request To Change the Proposed AD to a Supersedure
An anonymous commenter requested that the FAA designate the
proposed AD as a supersedure to AD 2004-12-08, Amendment 39-13667 (69
FR 34051, June 18, 2004) (AD 2004-12-08). The commenter noted that all
required actions of AD 2004-12-08 must have been completed within 90
days of July 23, 2004.
The FAA disagrees with the request to issue this final rule as a
supersedure AD. The ALS revisions required by AD 2004-12-08 include
enhanced inspections of certain life-limited parts at each piece-part
exposure while this AD requires the inclusion of two additional
inspections for only the HPT 1st-stage hub and HPT 2nd-stage hub at
piece-part exposure. The FAA has determined that a stand-alone AD is
appropriate because the only intent of this AD is to require updating
the existing ALS to add the two new inspections of the HPT 1st-stage
hub and HPT 2nd-stage hub at piece-part exposure. The FAA did not
change this AD as a result of this comment.
Request To Clarify Angle Ultrasonic Inspection (AUSI) Interval
SIAEC requested that the FAA clarify the inspection interval for
the AUSIs that are required for the HPT stage 1 hub having part number
(P/N) 2A5001 and HPT stage 2 hub having P/N 2A4802. SIAEC noted that
these parts are already listed in AMP section 18 and require
replacement before reaching 20,000 flight cycles, but the threshold for
the AUSI is not listed in the proposed AD, TASK 72-45-11-200-006 or
TASK 72-45-31-200-009.
The FAA agrees and has updated paragraph (g)(1) of this AD to
clarify that TASK 72-45-11-200-006 and TASK 72-45-31-200-009 are
located in paragraph B.1 of the Maintenance Scheduling section of the
applicable TLM, which is done at piece-part exposure.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, and
any other changes described previously, this AD is adopted as proposed
in the NPRM. None of the changes will increase the economic burden on
any operator.
Costs of Compliance
The FAA estimates that this AD affects 1,514 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Revise the ALS........................... 1 work-hour x $85 per hour $0 $85 $128,690
= $85.
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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
This AD will not have federalism implications under Executive Order
13132. This AD will 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 that this AD:
[[Page 42807]]
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will 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 Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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:
2025-17-16 International Aero Engines AG: Amendment 39-23126; Docket
No. FAA-2024-2423; Project Identifier AD-2024-00320-E.
(a) Effective Date
This airworthiness directive (AD) is effective October 10, 2025.
(b) Affected ADs
None.
(c) Applicability
This AD applies to International Aero Engines AG (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 AD within the compliance times specified,
unless already done.
(g) Required Action
(1) Within 90 days after the effective date of this AD, revise
paragraph B.1 of the Maintenance Scheduling section in the
airworthiness limitations section (ALS) of the Instructions for
Continued Airworthiness (ICA) located in the applicable existing
Time Limits Manual (TLM), as listed in paragraphs (g)(1)(i) through
(iii) of this AD, by incorporating the information specified in
table 1 to paragraph (g) of this AD:
(i) Part Number (P/N) 2A4408, TASK 05-10-00-990-000-B00
Instructions For Continued Airworthiness (V2500-A5);
(ii) P/N 2A4417, TASK 05-10-00-990-000 Instructions For
Continued Airworthiness (V2500-D5);
(iii) P/N 2A4384, TASK 05-10-00-990-000-A00 Instructions For
Continued Airworthiness (V2500-E5).
(2) For air carrier operations, within 90 days after the
effective date of this AD, revise the 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
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Part nomenclature Part No. Inspection (engine manual reference)
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HPT Stage 1 Hub............................ 2A5001 TASK 72-45-11-200-006.
HPT Stage 2 Hub............................ 2A4802 TASK 72-45-31-200-009.
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(h) Provisions for Alternative Actions
After the actions required by paragraph (g)(1) and (2) of this
AD have 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#17565a58545771767639707861"><span class="__cf_email__" data-cfemail="e4a5a9aba7a4828585ca838b92">[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#77141605181b591910020e12193711161659101801"><span class="__cf_email__" data-cfemail="f19290839e9ddf9f968488949fb1979090df969e87">[email protected]</span></a>.
(k) Material Incorporated by Reference
None.
Issued on August 28, 2025.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2025-17066 Filed 9-4-25; 8:45 am]
BILLING CODE 4910-13-P
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