Rule2026-01094
Airworthiness Directives; CFM International, S.A. Engines
Primary source
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Published
January 21, 2026
Effective
February 25, 2026
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is superseding Airworthiness Directive (AD) 2018-19-16 for all CFM International, S.A. (CFM) Model LEAP-1A23, -1A24, -1A24E1, -1A26, -1A26E1, -1A26CJ, -1A29, -1A29CJ, -1A30, -1A32, -1A33, -1A33B2, and -1A35A engines with certain full authority digital engine control (FADEC) and prognostic health monitoring (PHM) software installed. AD 2018-19-16 required removing certain FADEC and PHM software and installing versions eligible for installation. Since the FAA issued AD 2018-19-16, the manufacturer has developed a new pressure subsystem (PSS) with a heater element to evaporate potential moisture on the PSS manifold/transducer interface and prevent freezing at low temperature. This AD requires replacing certain FADEC and PHM software with new versions that are eligible for installation, replacing certain harnesses with newly designed harnesses, and replacing the PSS with a newly designed heated PSS. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 91 Issue 13 (Wednesday, January 21, 2026)</title>
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[Federal Register Volume 91, Number 13 (Wednesday, January 21, 2026)]
[Rules and Regulations]
[Pages 2465-2467]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-01094]
[[Page 2465]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-1725; Project Identifier AD-2025-00583-E;
Amendment 39-23244; AD 2026-02-08]
RIN 2120-AA64
Airworthiness Directives; CFM International, S.A. Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2018-19-16
for all CFM International, S.A. (CFM) Model LEAP-1A23, -1A24, -1A24E1,
-1A26, -1A26E1, -1A26CJ, -1A29, -1A29CJ, -1A30, -1A32, -1A33, -1A33B2,
and -1A35A engines with certain full authority digital engine control
(FADEC) and prognostic health monitoring (PHM) software installed. AD
2018-19-16 required removing certain FADEC and PHM software and
installing versions eligible for installation. Since the FAA issued AD
2018-19-16, the manufacturer has developed a new pressure subsystem
(PSS) with a heater element to evaporate potential moisture on the PSS
manifold/transducer interface and prevent freezing at low temperature.
This AD requires replacing certain FADEC and PHM software with new
versions that are eligible for installation, replacing certain
harnesses with newly designed harnesses, and replacing the PSS with a
newly designed heated PSS. The FAA is issuing this AD to address the
unsafe condition on these products.
DATES: This AD is effective February 25, 2026.
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2025-1725; 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: Mehdi Lamnyi, Aviation Safety
Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone:
(781) 238-7743; email: <a href="/cdn-cgi/l/email-protection#4c212924282562202d212235250c2a2d2d622b233a"><span class="__cf_email__" data-cfemail="5538303d313c7b3934383b2c3c153334347b323a23">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2018-19-16, Amendment 39-19416 (83 FR
50818, October 10, 2018) (AD 2018-19-16). AD 2018-19-16 applied to all
CFM Model LEAP-1A23, -1A24, -1A24E1, -1A26, -1A26E1, -1A26CJ, -1A29, -
1A29CJ, -1A30, -1A32, -1A33, -1A33B2, and -1A35A engines with certain
FADEC and PHM software installed. AD 2018-19-16 was prompted by aborted
takeoffs after engines did not advance to the desired takeoff fan speed
due to icing in the pressure sensor line which, if not addressed, could
result in loss of engine thrust control and reduced control of the
airplane. The NPRM was published in the Federal Register on August 6,
2025 (90 FR 37808). The NPRM was prompted when the manufacturer
developed a new PSS with a heater element to evaporate potential
moisture on the PSS manifold/transducer interface and prevent freezing
at low temperature. In the NPRM, the FAA proposed to require replacing
certain FADEC and PHM software with new versions that are eligible for
installation, replacing certain harnesses with newly designed
harnesses, and replacing the PSS with a newly designed heated PSS. 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 three commenters. The commenters
were Airline Pilots Association International (ALPA), American Airlines
(AAL), and CFM. ALPA supported the NPRM without change. The following
presents the comments received on the NPRM and the FAA's response to
each comment.
Request for Additional Material References
AAL and CFM requested that the FAA include additional material
references in the required actions. CFM stated that the material
referenced in paragraph (g)(1) of the NPRM includes concurrent actions
and refers to specific material for each of those actions. CFM also
indicated that the concurrent requirements are necessary to fully
enable the newly installed PSS heater system. AAL pointed out that
operators may not be aware that there is additional material which may
be used to help complete the concurrent actions and that a useful
method to alert the operators is by including the specific material for
the concurrent actions in additional notes to the required actions in
the NPRM.
The FAA agrees that the actions required by this AD are not
independent actions, and must all be done concurrently to fully enable
the newly installed PSS heater system, and that additional material is
helpful to complete the actions required by this AD. Therefore, the FAA
has revised this final rule by adding note 2 to paragraphs (g)(2) and
(3) of this AD and note 3 to paragraph (g)(4) of this AD, with each
note referring to specific material that may be used as guidance in
completing the actions required by paragraphs (g)(2), (3), and (4) of
this AD.
Request for Clarification of the Unsafe Condition
CFM requested that the FAA revise the unsafe condition statement
throughout the NPRM to be consistent. CFM noted that in the NPRM, the
unsafe condition statement is not consistent between the Background
section and paragraph (e) of the NPRM.
The FAA agrees for the reasons provided and has revised the wording
of the unsafe condition in the Background section to be consistent with
the wording used in paragraph (e) of this AD.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting the 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 306 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
[[Page 2466]]
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Install electronic engine control 1 work-hour x $85 per hour $0 $85 $26,010
software. = $85.
Replace PSS with heated PSS.............. 1 work-hour x $85 per hour 185,950 186,035 56,926,710
= $85.
Replace HJ6A and HJ6B harnesses.......... 1 work-hour x $85 per hour 57,510 57,595 17,624,070
= $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:
(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:
0
a. Removing Airworthiness Directive AD 2018-19-16, Amendment 39-19416
(83 FR 50818, October 10, 2018); and
0
b. Adding the following new airworthiness directive:
2026-02-08 CFM International, S.A.: Amendment 39-23244; Docket No.
FAA-2025-1725; Project Identifier AD-2025-00583-E.
(a) Effective Date
This airworthiness directive (AD) is effective February 25,
2026.
(b) Affected ADs
This AD replaces AD 2018-19-16, Amendment 39-19416 (83 FR 50818,
October 10, 2018) (AD 2018-19-16).
(c) Applicability
This AD applies to CFM International, S.A. (CFM) Model LEAP-
1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26E1, LEAP-1A26CJ,
LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-
1A33B2, and LEAP-1A35A engines.
(d) Subject
Joint Aircraft System Component (JASC) Code 7600, Engine
Controls.
(e) Unsafe Condition
This AD was prompted by aborted takeoffs after engines did not
advance to the desired takeoff fan speed due to icing in the
pressure sensor line. The FAA is issuing this AD to prevent icing in
the pressure sensor lines and inaccurate pressure sensor readings.
The unsafe condition, if not addressed, could result in loss of
engine thrust control and reduced control of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
At the next engine shop visit after the effective date of this
AD, do the following actions:
(1) Install electronic engine control (EEC) full authority
digital electronic control (FADEC) software having part number (P/N)
2590M00P13, version L1A0850, or later approved version; and
prognostic health monitoring (PHM) software having P/N 2784M64P08,
version PL1A0850, or later approved version.
Note 1 to paragraph (g)(1): The software release that includes
EEC FADEC software P/N 2590M00P13, version L1A0850, and PHM software
P/N 2784M64P08, version PL1A0850, is commonly referred to as
``FCS8.5.'' Guidance for replacing the EEC FADEC software and PHM
software may be found in CFM Service Bulletin LEAP-1A-73-00-0050-
01A-930A-D, Issue 001-00, dated January 03, 2024.
(2) For engines with an installed HJ6A harness having P/N 362-
085-905-0 (significant item number (SIN) 65004), remove the HJ6A
harness from service and replace with an HJ6A harness having P/N
362-085-906-0, or later approved P/N.
Note 2 to paragraph (g)(2): This note applies to paragraphs
(g)(2) and (g)(3). Guidance for replacing the HJ6A harness P/N 362-
085-905-0 and the HJ6B harness P/N 362-086-004-0 with an HJ6A
harness P/N 362-085-906-0 or an HJ6B harness P/N 362-086-005-0, or
later approved P/N, as applicable, may be found in CFM Service
Bulletin LEAP-1A-73-00-0042-01A-930A-D, Issue 003-00, dated July 11,
2024.
(3) For engines with an installed HJ6B harness having P/N 362-
086-004-0 (SIN 65005), remove the HJ6B harness from service and
replace with an HJ6B harness having P/N 362-086-005-0, or later
approved P/N.
(4) For engines with an installed pressure subsystem (PSS)
having P/N 2474M65P05 (vendor identification number (VIN) 261811055-
0303), remove the PSS from service and replace with a heated PSS
having P/N 2474M65P08 (VIN 261811055-0410), or later approved P/N.
Note 3 to paragraph (g)(4): Guidance for replacing the PSS P/N
2474M65P05 with a heated PSS P/N 2474M65P08, or later approved P/N
may be found in CFM Service Bulletin LEAP-1A-73-00-0051-01A-930A-D,
Issue 002-00, dated January 03, 2024.
(h) Definitions
For the purpose of this AD, an ``engine shop visit'' is the
induction of the engine into the shop for maintenance involving the
separation of major mating engine flanges, except for the separation
of engine flanges solely for the purposes of transportation without
subsequent engine maintenance.
(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,
[[Page 2467]]
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)(1) of this AD and email to: <a href="/cdn-cgi/l/email-protection#2e6f63616d6e484f4f00494158"><span class="__cf_email__" data-cfemail="d99894969a99bfb8b8f7beb6af">[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
(1) For more information about this AD, contact Mehdi Lamnyi,
Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines,
WA 98198; phone: (781) 238-7743; email: <a href="/cdn-cgi/l/email-protection#234e464b474a0d4f424e4d5a4a634542420d444c55"><span class="__cf_email__" data-cfemail="563b333e323f783a373b382f3f1630373778313920">[email protected]</span></a>.
(2) For material identified in this AD that is not incorporated
by reference, contact CFM, GE Aviation Fleet Support, 1 Neumann Way,
M/D Room 285, Cincinnati, OH 45215; phone: (877) 432-3272; email:
<a href="/cdn-cgi/l/email-protection#2746514e46534e484909414b424253545257574855536740420944484a"><span class="__cf_email__" data-cfemail="cfaeb9a6aebba6a0a1e1a9a3aaaabbbcbabfbfa0bdbb8fa8aae1aca0a2">[email protected]</span></a>.
(k) Material Incorporated by Reference
None.
Issued on January 16, 2026.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2026-01094 Filed 1-20-26; 8:45 am]
BILLING CODE 4910-13-P
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