[Federal Register Volume 91, Number 13 (Wednesday, January 21, 2026)]
[Rules and Regulations]
[Pages 2459-2461]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2026-01032]
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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.
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Federal Register / Vol. 91, No. 13 / Wednesday, January 21, 2026 /
Rules and Regulations
[[Page 2459]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-1351; Project Identifier MCAI-2024-00667-T;
Amendment 39-23242; AD 2026-02-06]
RIN 2120-AA64
Airworthiness Directives; Bombardier, Inc., Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by
a report that some parts of horizontal stabilizer trim actuators
(HSTAs) that were meant to be replaced through a required overhaul were
not replaced and were instead reinstalled on the HSTAs. This AD
requires verification of the HSTA serial number, and, if applicable,
replacement of the HSTA. This AD also prohibits the installation of
affected parts under certain conditions. The FAA is issuing this AD to
address the unsafe condition on these products.
DATES: This AD is effective February 25, 2026.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of February 25,
2026.
ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2025-1351; 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:
For Bombardier material identified in this AD, contact
Bombardier Business Aircraft Customer Response Center, 400 C[ocirc]te-
Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; telephone 514-
855-2999; email [email protected]; website https://my.bombardier.com/.
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 regulations.gov under
Docket No. FAA-2025-1351.
FOR FURTHER INFORMATION CONTACT: John Massey, Aviation Safety Engineer,
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (516)
228-7300; email: [email protected].
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 all Bombardier, Inc.,
Model BD-100-1A10 airplanes. The NPRM was published in the Federal
Register on July 2, 2025 (90 FR 28916). The NPRM was prompted by AD CF-
2024-38, dated November 12, 2024 (Transport Canada AD CF-2024-38) (also
referred to as the MCAI), issued by Transport Canada, which is the
aviation authority for Canada. The MCAI states that Bombardier has been
advised that the overhaul required by certificate maintenance
requirement (CMR) task 27-40-00-104* was not fully completed on some
units. As a result, some of the parts that were required to be replaced
on the affected HSTAs as part of the overhauled task were re-installed
in error. This condition, if not corrected, can lead to the failure of
HSTA components, which can contribute to horizontal stabilizer surface
disconnect at the actuator level and could lead to loss of continued
safe flight and landing.
In the NPRM, the FAA proposed to require verification of the HSTA
serial number, and, if applicable, replacement of the HSTA. The FAA
also proposed to prohibit the installation of affected parts under
certain conditions. The FAA is issuing this AD to address the unsafe
condition on these products.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2025-1351.
Discussion of Final Airworthiness Directive
Comments
The FAA received a comment from NetJets. The following presents the
comment received on the NPRM and the FAA's response.
Request To Clarify Requirement if Modification Plate Is Marked
NetJets asked whether an affected HSTA, found during the proposed
inspection or records review, would need to be replaced if its
modification plate is marked with Moog Service Bulletin C47100-27-07,
as specified in section 2.B. of Bombardier Service Bulletin 350-27-014.
The FAA clarifies that an affected HSTA does not need to be
replaced if it has a modification plate marked with Moog Service
Bulletin C47100-27-07 because that marking indicates the part has
already been properly reworked. The FAA recognizes that this relief is
specified in paragraph 2.B.(4)(b) of the Bombardier service bulletin,
and that Transport Canada AD CF-2024-38 allows installation of a part
marked with the Moog service bulletin. Accordingly, the FAA has revised
paragraph (h) of this AD to except any affected HSTA marked with the
Moog service bulletin.
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, 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.
[[Page 2460]]
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed the following Bombardier material:
Bombardier Service Bulletin 100-27-23, dated October 28,
2024;
Bombardier Service Bulletin 350-27-014, dated October 28,
2024.
This material specifies procedures for verifying the HSTA serial
number and, if applicable, corrective actions to include replacing the
HSTA. These documents are distinct since they apply to different
airplane configurations.
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 982 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
Labor cost Parts cost Cost per product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Up to 2 work-hours x $85 per $0 Up to $170.................... Up to $166,940.
hour = Up to $170.
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The FAA estimates the following costs to do any 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
------------------------------------------------------------------------
20 work-hours x $85 per hour = $1,700 $53,665 $55,365
------------------------------------------------------------------------
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this AD may be covered under warranty, thereby reducing the cost impact
on affected operators.
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 adding the following new airworthiness
directive:
2026-02-06 Bombardier, Inc.: Amendment 39-23242; Docket No. FAA-
2025-1351; Project Identifier MCAI-2024-00667-T.
(a) Effective Date
This airworthiness directive (AD) is effective February 25,
2026.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all Bombardier, Inc., Model BD-100-1A10
airplanes, certificated in any category.
(d) Subject
Air Transport Association (ATA) of America Code 27, Flight
controls.
(e) Unsafe Condition
This AD was prompted by a report that some parts of horizontal
stabilizer trim actuators (HSTAs) that were meant to be replaced
through a required overhaul were not replaced and were instead
reinstalled on the HSTAs. The FAA is issuing this AD to address HSTA
parts that were not replaced as required. The unsafe condition, if
not addressed, could result in the failure of HSTA components, which
can contribute to horizontal stabilizer surface disconnect at the
actuator level and could lead to loss of continued safe flight and
landing.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Records Verification and Corrective Actions
At the applicable time specified in figure 1 to paragraph (g) of
this AD, do an inspection to determine the serial number of HSTA
part number C47100-004 or C47100-005 in accordance with Section
2.B., Part A, of the Accomplishment Instructions of Bombardier
Service Bulletin 100-27-23 or 350-27-014, both dated October 28,
2024, as
[[Page 2461]]
applicable. A review of the airplane maintenance records is also
acceptable provided the serial number of the HSTA can be
conclusively determined from that review.
Figure 1 to Paragraph (g)--Compliance Time for Records Verification
------------------------------------------------------------------------
HSTA total flight hours accumulated as of
the effective date of this AD Compliance time
------------------------------------------------------------------------
10,000 or more............................ Before accumulating 14,500
total flight hours on the
HSTA, or before
accumulating 7,500 total
flight cycles on the HSTA,
or within 24 months after
the effective date of this
AD, whichever occurs first.
9,700 or more but less than 10,000........ Before accumulating 14,500
total flight hours on the
HSTA, or before
accumulating 7,500 total
flight cycles on the HSTA,
or within 36 months after
the effective date of this
AD, whichever occurs first.
Less than 9,700........................... Before accumulating 14,500
total flight hours on the
HSTA, or before
accumulating 7,500 total
flight cycles on the HSTA,
or within 48 months after
the effective date of this
AD, whichever occurs first.
------------------------------------------------------------------------
(h) HSTA Replacement
If, during the inspection or records review required by
paragraph (g) of this AD, any HSTA having part number C47100-004 or
C47100-005, with a serial number listed in Section 1.A. of
Bombardier Service Bulletin 100-27-23 or 350-27-014, both dated
October 28, 2024, as applicable is found: At the applicable time
specified in figure 1 to paragraph (g) of this AD, replace the HSTA
in accordance with Sections 2.C. and 2.D. of the Accomplishment
Instructions of Bombardier Service Bulletin 100-27-23 or 350-27-014,
both dated October 28, 2024, as applicable, unless the HSTA has a
modification plate marked with Moog Service Bulletin C47100-27-07.
(i) Parts Installation Limitation
As of the effective date of this AD, no person may install, on
any airplane, an HSTA, part number C47100-004 or C47100-005, with a
serial number listed in Section 1.A. of Bombardier Service Bulletin
100-27-23 or 350-27-014, both dated October 28, 2024, unless the
HSTA has a modification plate marked with Moog Service Bulletin
C47100-27-07.
(j) 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 (k) of this AD and email to:
[email protected]. 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 Bombardier's
Transport Canada Design Approval Organization (DAO). If approved by
the DAO, the approval must include the DAO-authorized signature.
(k) Additional Information
For more information about this AD, contact John Massey,
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; phone: (516) 228-7300; email: [email protected].
(l) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference 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.
(i) Bombardier Service Bulletin 100-27-23, dated October 28,
2024.
(ii) Bombardier Service Bulletin 350-27-014, dated October 28,
2024.
(3) For Bombardier material identified in this AD, contact
Bombardier Business Aircraft Customer Response Center, 400
C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada;
telephone 514-855-2999; email [email protected]; website
https://my.bombardier.com/.
(4) 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.
(5) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].
Issued on January 14, 2026.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2026-01032 Filed 1-20-26; 8:45 am]
BILLING CODE 4910-13-P