Rule2026-07736
Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Primary source
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Published
April 21, 2026
Effective
May 26, 2026
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is superseding Airworthiness Directive (AD) 2025-22- 02, which applied to certain MHI RJ Aviation ULC (type certificate previously held by Bombardier, Inc.) Model CL-600-2C10 (Regional Jet Series 700, 701 &702), CL-600-2C11 (Regional Jet Series 550), CL-600- 2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000) airplanes. AD 2025-22-02 required repetitive torque checks of the horizontal stabilizer (H-stab) anti-yaw steady fitting block bolts. Since the FAA issued AD 2025-22- 02, it was determined that additional actions must be done to address the unsafe condition. This AD continues to require the actions in AD 2025-22-02 and requires replacing the H-stab anti-yaw steady fitting block hardware. 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 76 (Tuesday, April 21, 2026)</title>
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[Federal Register Volume 91, Number 76 (Tuesday, April 21, 2026)]
[Rules and Regulations]
[Pages 21245-21247]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-07736]
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Rules and Regulations
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains regulatory documents
having general applicability and legal effect, most of which are keyed
to and codified in the Code of Federal Regulations, which is published
under 50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by the Superintendent of Documents.
========================================================================
Federal Register / Vol. 91, No. 76 / Tuesday, April 21, 2026 / Rules
and Regulations
[[Page 21245]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2026-0728; Project Identifier MCAI-2025-01823-T;
Amendment 39-23310; AD 2026-08-02]
RIN 2120-AA64
Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.) Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2025-22-
02, which applied to certain MHI RJ Aviation ULC (type certificate
previously held by Bombardier, Inc.) Model CL-600-2C10 (Regional Jet
Series 700, 701 &702), CL-600-2C11 (Regional Jet Series 550), CL-600-
2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900),
and CL-600-2E25 (Regional Jet Series 1000) airplanes. AD 2025-22-02
required repetitive torque checks of the horizontal stabilizer (H-stab)
anti-yaw steady fitting block bolts. Since the FAA issued AD 2025-22-
02, it was determined that additional actions must be done to address
the unsafe condition. This AD continues to require the actions in AD
2025-22-02 and requires replacing the H-stab anti-yaw steady fitting
block hardware. The FAA is issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective May 26, 2026.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of November 20,
2025 (90 FR 49251, November 5, 2025).
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2026-0728; 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, the mandatory continuing airworthiness
information (MCAI), 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.
Material Incorporated by Reference:
<bullet> For Transport Canada material identified in this AD,
contact Transport Canada, Transport Canada National Aircraft
Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada;
telephone 888-663-3639; email <a href="/cdn-cgi/l/email-protection#2e7a6d006f475c59415c5a4647404b5d5d6a475c4b4d5a47584b5d036d41405d4749404b5d4a4b404f5847494f4c4742475a4b007a6d6e5a4d00494d004d4f"><span class="__cf_email__" data-cfemail="f6a2b5d8b79f84819984829e9f98938585b29f849395829f809385dbb59998859f9198938592939897809f9197949f9a9f8293d8a2b5b68295d89195d89597">[email protected]</span></a>. You may find this material on the
Transport Canada website at tc.canada.ca/en/aviation.
<bullet> You may view this material at the FAA, Airworthiness
Products Section, Operational Safety Branch, 2200 South 216th St., Des
Moines, WA. For information on the availability of this material at the
FAA, call 206-231-3195. It is also available at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2026-0728.
FOR FURTHER INFORMATION CONTACT: Fatin Saumik, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
phone: 516-228-7300; email: <a href="/cdn-cgi/l/email-protection#7f46521e090c5211061e1c10521c100c3f191e1e51181009"><span class="__cf_email__" data-cfemail="5f66723e292c7231263e3c30723c302c1f393e3e71383029">[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 2025-22-02, Amendment 39-23180 (90 FR
49251, November 5, 2025) (AD 2025-22-02). AD 2025-22-02 applied to
certain MHI RJ Aviation ULC (type certificate previously held by
Bombardier, Inc.) Model CL-600-2C10 (Regional Jet Series 700, 701
&702), CL-600-2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet
Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25
(Regional Jet Series 1000) airplanes. AD 2025-22-02 required repetitive
torque checks of the H-stab anti-yaw steady fitting block bolts. The
FAA issued AD 2025-22-02 to address loose or missing bolts on the anti-
yaw steady fitting block, which, when combined with a bird strike or
gust loading, may result in loss of the H-stab and consequent loss of
control of the airplane.
The NPRM was published in the Federal Register on January 27, 2026
(91 FR 3394). The NPRM was prompted by AD CF-2025-38, dated August 19,
2025 (Transport Canada AD CF-2025-38) (also referred to as the MCAI),
issued by Transport Canada, which is the aviation authority for Canada.
The MCAI states that loose or missing bolts on the anti-yaw steady
fitting block, when combined with a bird strike or gust loading, may
result in loss of the H-stab.
The preamble to AD 2025-22-02 specifies that the FAA considers that
AD to be an ``interim action'' and that the FAA might consider further
rulemaking to mandate the replacement of the H-stab anti-yaw steady
fitting block hardware. The FAA has determined that this replacement
must be required.
In the NPRM, the FAA proposed to continue to require the actions in
AD 2025-22-02 and require replacing the H-stab anti-yaw steady fitting
block hardware, as specified in Transport Canada AD CF-2025-38. The FAA
is issuing this AD to address the unsafe condition on these products.
You may examine the MCAI in the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2026-0728.
Discussion of Final Airworthiness Directive
Comments
The FAA received a comment from the Air Line Pilots Association,
International (ALPA) who supported the NPRM without change.
Conclusion
These products have been approved by the civil aviation authority
of another country and are approved for operation in the United States.
Pursuant to the FAA's bilateral agreement with this State of Design
Authority, that authority has notified the FAA of the unsafe condition
described in the MCAI referenced above. 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, this AD is
[[Page 21246]]
adopted as proposed in the NPRM. None of the changes will increase the
economic burden on any operator.
Material Incorporated by Reference Under 1 CFR Part 51
This AD requires Transport Canada AD CF-2025-38, dated August 19,
2025, which the Director of the Federal Register approved for
incorporation by reference as of November 20, 2025 (90 FR 49251,
November 5, 2025).
This material is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in the ADDRESSES section.
Costs of Compliance
The FAA estimates that this AD affects 597 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
Parts Cost on U.S.
Action Labor cost cost Cost per product operators
----------------------------------------------------------------------------------------------------------------
Retained actions from AD 2025-22- Up to 6 work-hours x $0 Up to $510.......... Up to $304,470.
02. $85 per hour = $510.
New actions....................... 7 work-hours x $85 27 $622................ $371,334.
per hour = $595.
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The FAA estimates the following costs to do any necessary on-
condition action that would be required based on the results of any
required actions. The FAA has no way of determining the number of
aircraft that might need this on-condition action:
Estimated Costs of On-Condition Actions
------------------------------------------------------------------------
Labor cost Parts cost Cost per product
------------------------------------------------------------------------
1 work-hour x $85 per hour = $85 Up to $28......... Up to $113.
------------------------------------------------------------------------
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) 2025-22-02, Amendment 39-23180
(90 FR 49251, November 5, 2025); and
0
b. Adding the following new AD:
2026-08-02 MHI RJ Aviation ULC (Type Certificate Previously Held by
Bombardier, Inc.): Amendment 39-23310; Docket No. FAA-2026-0728;
Project Identifier MCAI-2025-01823-T.
(a) Effective Date
This airworthiness directive (AD) is effective May 26, 2026.
(b) Affected ADs
This AD replaces AD 2025-22-02, Amendment 39-23180 (90 FR 49251,
November 5, 2025) (AD 2025-22-02).
(c) Applicability
This AD applies to MHI RJ Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.) Model CL-600-2C10 (Regional Jet
Series 700, 701 &702), CL-600-2C11 (Regional Jet Series 550), CL-
600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series
900), and CL-600-2E25 (Regional Jet Series 1000) airplanes,
certificated in any category, as identified in Transport Canada AD
CF-2025-38, effective August 19, 2025 (Transport Canada AD CF-2025-
38).
(d) Subject
Air Transport Association (ATA) of America Code 55, Stabilizers.
(e) Unsafe Condition
This AD was prompted by reports of loose and missing bolts on
the horizontal stabilizer anti-yaw steady fitting block. The FAA is
issuing this AD to address loose or missing bolts on the anti-yaw
steady fitting block, which, when combined with a bird strike or
gust loading, may result in loss of the horizontal stabilizer and
consequent loss of control of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
[[Page 21247]]
(g) Requirements
Except as specified in paragraph (h) of this AD: Comply with all
required actions and compliance times specified in, and in
accordance with, Transport Canada AD CF-2025-38.
(h) Exception to Transport Canada AD CF-2025-38
(1) Where Transport Canada AD CF-2025-38 refers to its effective
date, this AD requires using November 20, 2025 (the effective date
of AD 2025-22-02).
(2) Where Transport Canada AD CF-2025-38 refers to hours air
time, this AD requires using flight hours.
(3) Where Transport Canada AD CF-2025-38 refers to the effective
date of Transport Canada AD CF-2024-24 (July 4, 2024), this AD
requires using the effective date of this AD.
(4) Where paragraph B. of Transport Canada AD CF-2025-38
specifies to repeat the torque check ``every 2200 hours air time
from the previous inspection'', for this AD, replace that text with
``at intervals not to exceed 2,200 flight hours''.
(i) Additional AD Provisions
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager,
International Validation 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 responsible Flight Standards Office, as
appropriate. If sending information directly to the manager of the
International Validation 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#6425292b27240205054a030b12"><span class="__cf_email__" data-cfemail="f3b2bebcb0b3959292dd949c85">[email protected]</span></a>. Before using any approved AMOC, notify your
appropriate principal inspector, or lacking a principal inspector,
the manager of the responsible Flight Standards Office.
(2) Contacting the Manufacturer: For any requirement in this AD
to obtain instructions from a manufacturer, the instructions must be
accomplished using a method approved by the Manager, International
Validation Branch, FAA; or Transport Canada; or MHI RJ Aviation
ULC's Transport Canada Design Approval Organization (DAO). If
approved by the DAO, the approval must include the DAO-authorized
signature.
(j) Additional Information
For more information about this AD, contact Fatin Saumik,
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; phone: 516-228-7300; email: <a href="/cdn-cgi/l/email-protection#724b5f1304015f1c0b13111d5f111d01321413135c151d04"><span class="__cf_email__" data-cfemail="380115594e4b155641595b57155b574b785e5959165f574e">[email protected]</span></a>.
(k) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the material listed in this
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this material as applicable to do the actions
required by this AD, unless this AD specifies otherwise.
(3) The following material was approved for IBR on November 20,
2025 (90 FR 49251, November 5, 2025).
(i) Transport Canada AD CF-2025-38, effective August 19, 2025.
(ii) [Reserved]
(4) For Transport Canada material identified in this AD, contact
Transport Canada, Transport Canada National Aircraft Certification,
159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888-
663-3639; email <a href="/cdn-cgi/l/email-protection#b5e1f69bf4dcc7c2dac7c1dddcdbd0c6c6f1dcc7d0d6c1dcc3d0c698f6dadbc6dcd2dbd0c6d1d0dbd4c3dcd2d4d7dcd9dcc1d09be1f6f5c1d69bd2d69bd6d4"><span class="__cf_email__" data-cfemail="df8b9cf19eb6ada8b0adabb7b6b1baacac9bb6adbabcabb6a9baacf29cb0b1acb6b8b1baacbbbab1bea9b6b8bebdb6b3b6abbaf18b9c9fabbcf1b8bcf1bcbe">[email protected]</span></a>. You may find this material on
the Transport Canada website at tc.canada.ca/en/aviation.
(5) You may view this material at the FAA, Airworthiness
Products Section, Operational Safety Branch, 2200 South 216th St.,
Des Moines, WA. For information on the availability of this material
at the FAA, call 206-231-3195.
(6) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit <a href="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a> or email <a href="/cdn-cgi/l/email-protection#0462762a6d6a77746167706d6b6a446a6576652a636b72"><span class="__cf_email__" data-cfemail="cfa9bde1a6a1bcbfaaacbba6a0a18fa1aebdaee1a8a0b9">[email protected]</span></a>.
Issued on April 16, 2026.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2026-07736 Filed 4-20-26; 8:45 am]
BILLING CODE 4910-13-P
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