Proposed Rule2026-01495
Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Primary source
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Published
January 27, 2026
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to supersede Airworthiness Directive (AD) 2025-22-02, which applies 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 requires repetitive torque checks of the 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 proposed AD would continue to require the actions in AD 2025-22-02 and would require replacing the H-Stab anti-yaw steady fitting block hardware. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 91 Issue 17 (Tuesday, January 27, 2026)</title>
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[Federal Register Volume 91, Number 17 (Tuesday, January 27, 2026)]
[Proposed Rules]
[Pages 3394-3397]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-01495]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2026-0728; Project Identifier MCAI-2025-01823-T]
RIN 2120-AA64
Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.) Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2025-22-02, which applies 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 requires repetitive torque checks of the 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 proposed AD would continue to require the actions in AD
2025-22-02 and would require replacing the H-Stab anti-yaw steady
fitting block hardware. 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 March 13,
2026.
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 <a href="http://regulations.gov">regulations.gov</a>. 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 <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 NPRM, the mandatory continuing airworthiness
information (MCAI), any comments received, and other information. The
street address for Docket Operations is listed above.
Material Incorporated by Reference:
<bullet> Transport Canada material identified in this proposed 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#86d2c5a8c7eff4f1e9f4f2eeefe8e3f5f5c2eff4e3e5f2eff0e3f5abc5e9e8f5efe1e8e3f5e2e3e8e7f0efe1e7e4efeaeff2e3a8d2c5c6f2e5a8e1e5a8e5e7"><span class="__cf_email__" data-cfemail="7327305d321a01041c01071b1a1d160000371a011610071a0516005e301c1d001a141d160017161d12051a1412111a1f1a07165d27303307105d14105d1012">[email protected]</span></a>. You may find this material on the
Transport Canada website at tc.canada.ca/en/aviation. It is also
available at <a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2026-0728.
<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.
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#f9c0d4988f8ad49780989a96d49a968ab99f9898d79e968f"><span class="__cf_email__" data-cfemail="dde4f0bcabaef0b3a4bcbeb2f0beb2ae9dbbbcbcf3bab2ab">[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 using a method listed
under the ADDRESSES section. Include ``Docket No. FAA-2026-0728;
Project Identifier MCAI-2025-01823-T'' 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
[[Page 3395]]
<a href="http://regulations.gov">regulations.gov</a>, 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 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#c1f8eca0b7b2ecafb8a0a2aeeca2aeb281a7a0a0efa6aeb7"><span class="__cf_email__" data-cfemail="c2fbefa3b4b1efacbba3a1adefa1adb182a4a3a3eca5adb4">[email protected]</span></a>. 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 issued AD 2025-22-02, Amendment 39-23180 (90 FR 49251,
November 5, 2025) (AD 2025-22-02), for 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 was prompted by an MCAI originated by
Transport Canada, which is the aviation authority for Canada. Transport
Canada issued AD CF-2025-38, effective August 19, 2025 (Transport
Canada AD CF-2025-38) (also referred to as the MCAI), to correct an
unsafe condition.
AD 2025-22-02 requires 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 horizontal stabilizer and consequent loss of control of the
airplane.
Actions Since AD 2025-22-02 Was Issued
Since the FAA issued AD 2025-22-02, it was determined that
additional actions must be done to address the unsafe condition.
Transport Canada AD CF-2025-38 requires the replacement of the H-Stab
anti-yaw steady fitting block hardware within 6,600 flight hours or 6
years, whichever occur first. The preamble to FAA AD 2025-22-02
explained that the planned compliance time for that replacement would
have allowed enough time to provide notice and opportunity for prior
public comment on the merits of the action. Therefore, AD 2025-22-02
did not require the replacement but it did allow the replacement as an
optional terminating action for the repetitive torque checks. AD 2025-
22-02 was considered to be interim action pending the FAA's
consideration of further rulemaking to mandate the replacement. The FAA
has determined that this replacement must be required.
The FAA is proposing 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.
Material Incorporated by Reference Under 1 CFR Part 51
This proposed AD would require Transport Canada AD CF-2025-38,
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.
FAA's Determination
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 is issuing this NPRM
after determining that the unsafe condition described previously is
likely to exist or develop in other products of the same type design.
Proposed AD Requirements in This NPRM
This proposed AD would continue to require the actions in AD 2025-
22-02 and would require replacing the H-Stab anti-yaw steady fitting
block hardware.
Explanation of Required Compliance Information
In the FAA's ongoing efforts to improve the efficiency of the AD
process, the FAA developed a process to use some civil aviation
authority (CAA) ADs as the primary source of information for compliance
with requirements for corresponding FAA ADs. The FAA has been
coordinating this process with manufacturers and CAAs. As a result, the
FAA proposes to retain the incorporation by reference (IBR) of
Transport Canada AD CF-2025-38 in the FAA final rule. This proposed AD
would, therefore, require compliance with Transport Canada AD CF-2025-
38 in its entirety through that incorporation, except for any
differences identified as exceptions in the regulatory text of this
proposed AD. Material required by Transport Canada AD CF-2025-38 for
compliance will be available at <a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-
2026-0728 after the FAA final rule is published.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 597 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
Estimated Costs for Required Actions
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Action Labor cost Parts cost Cost per product Cost on U.S. operators
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Retained actions from AD 2025- Up to 6 work- $0 Up to $510....... Up to $304,470.
22-02. hours x $85 per
hour = $510.
New proposed actions.......... 7 work-hour 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
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number of aircraft that might need this on-condition action:
Estimated Costs of On-Condition Actions
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Labor cost Parts cost Cost per product
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1 work-hour x $85 per hour = Up to $28...... Up to $113.
$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
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:
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:
MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier,
Inc.): Docket No. FAA-2026-0728; Project Identifier MCAI-2025-01823-
T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by March 13, 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 Code55, 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.
(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 torques 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#20616d6f63604641410e474f56"><span class="__cf_email__" data-cfemail="53121e1c10133532327d343c25">[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#b28b9fd3c4c19fdccbd3d1dd9fd1ddc1f2d4d3d39cd5ddc4"><span class="__cf_email__" data-cfemail="dde4f0bcabaef0b3a4bcbeb2f0beb2ae9dbbbcbcf3bab2ab">[email protected]</span></a>.
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(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#1044533e517962677f626478797e756363547962757364796675633d537f7e6379777e756374757e716679777172797c7964753e44535064733e77733e7371"><span class="__cf_email__" data-cfemail="1440573a557d66637b66607c7d7a716767507d667177607d62716739577b7a677d737a716770717a75627d7375767d787d60713a40575460773a73773a7775">[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#2c4a5e0245425f5c494f584543426c424d5e4d024b435a"><span class="__cf_email__" data-cfemail="e68094c88f8895968385928f8988a688879487c8818990">[email protected]</span></a>.
Issued on January 22, 2026.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2026-01495 Filed 1-26-26; 8:45 am]
BILLING CODE 4910-13-P
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