Proposed Rule2025-12369
Airworthiness Directives; Bombardier, Inc., Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
July 2, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for all Bombardier, Inc., Model BD-100-1A10 airplanes. This proposed 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 proposed AD would require verification of the HSTA serial number, and, if applicable, replacement of the HSTA. This proposed AD would also prohibit the installation of affected parts under certain conditions. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
<html>
<head>
<title>Federal Register, Volume 90 Issue 125 (Wednesday, July 2, 2025)</title>
</head>
<body><pre>
[Federal Register Volume 90, Number 125 (Wednesday, July 2, 2025)]
[Proposed Rules]
[Pages 28916-28918]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-12369]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-1351; Project Identifier MCAI-2024-00667-T]
RIN 2120-AA64
Airworthiness Directives; Bombardier, Inc., Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for all Bombardier, Inc., Model BD-100-1A10 airplanes. This proposed 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 proposed AD would require verification of the HSTA serial number,
and, if applicable, replacement of the HSTA. This proposed AD would
also prohibit the installation of affected parts under certain
conditions. 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 August 18,
2025.
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-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 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> For Bombardier material identified in this proposed 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 <a href="/cdn-cgi/l/email-protection#8eefeda0f7fbe2ceefebfce1a0b2efaee6fcebe8b3" http: bombardier.com">bombardier.com</a>">ac.yul@aero.<a href="http://bombardier.com">bombardier.com</a></a>; website
<a href="http://bombardier.com">bombardier.com</a>.
<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: John Massey, Aviation Safety Engineer,
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (516)
228-7300; email: <a href="/cdn-cgi/l/email-protection#99a0b4f8efeab4f7e0f8faf6b4faf6ead9fff8f8b7fef6ef"><span class="__cf_email__" data-cfemail="11283c7067623c7f6870727e3c727e62517770703f767e67">[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 to an address listed
under the ADDRESSES section. Include ``Docket No. FAA-2025-1351;
Project Identifier MCAI-2024-00667-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 the 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
<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 John
Massey, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; phone: (516) 228-7300; email: <a href="/cdn-cgi/l/email-protection#a39a8ec2d5d08ecddac2c0cc8ec0ccd0e3c5c2c28dc4ccd5"><span class="__cf_email__" data-cfemail="ead3c78b9c99c784938b8985c7898599aa8c8b8bc48d859c">[email protected]</span></a>. Any commentary that the FAA receives that is not
specifically designated as CBI will be placed in the public docket for
this rulemaking.
Background
Transport Canada, which is the aviation authority for Canada, has
issued Transport Canada AD CF-2024-38, dated November 12, 2024
(Transport Canada AD CF-2024-38) (also referred to after this as the
MCAI), to correct an unsafe condition on all Bombardier, Inc., Model
BD-100-1A10 airplanes. 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.
The FAA is proposing this AD to address the unsafe condition on
these products.
[[Page 28917]]
You may examine the MCAI in the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2025-1351.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed the following Bombardier material:
<bullet> Bombardier Service Bulletin 100-27-23, dated October 28,
2024;
<bullet> 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.
FAA's Determination
This product has been approved by the aviation authority of another
country and is approved for operation in the United States. Pursuant to
the FAA's bilateral agreement with this State of Design Authority, it
has notified the FAA of the unsafe condition described in the MCAI and
material referenced above. The FAA is issuing this NPRM after
determining that the unsafe condition described previously is likely to
exist or develop on other products of the same type design.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified
in the material already described. This proposed AD would also prohibit
the installation of affected parts under certain conditions.
Regarding the corrective action for certain HSTAs, as specified in
Bombardier Service Bulletin 100-27-23 and 350-27-014, both dated
October 28, 2024, rework of the HSTA is required by the manufacturer,
since this manufacturer is the only producer of the affected part.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 982 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed 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 hour $0 Up to $170.................. Up to $166,940.
= Up to $170.
----------------------------------------------------------------------------------------------------------------
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 = $53,665 $55,365
$1,700.........................
------------------------------------------------------------------------
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this proposed 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
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 adding the following new airworthiness
directive:
Bombardier, Inc: Docket No. FAA-2025-1351; Project Identifier MCAI-
2024-00667-T.
[[Page 28918]]
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by August 18, 2025.
(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 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 Compliance time
date of this AD
------------------------------------------------------------------------
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.
(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:
<a href="/cdn-cgi/l/email-protection#aaebe7e5e9eacccbcb84cdc5dc"><span class="__cf_email__" data-cfemail="1a5b5755595a7c7b7b347d756c">[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 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: <a href="/cdn-cgi/l/email-protection#8fb6a2eef9fca2e1f6eeece0a2ece0fccfe9eeeea1e8e0f9"><span class="__cf_email__" data-cfemail="6a53470b1c194704130b0905470905192a0c0b0b440d051c">[email protected]</span></a>.
(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 <a href="/cdn-cgi/l/email-protection#cfaeace1b6baa38faeaabda0e1f3aeefa7bdaaa9f2" http: bombardier.com">bombardier.com</a>">ac.yul@aero.<a href="http://bombardier.com">bombardier.com</a></a>; website
<a href="http://bombardier.com">bombardier.com</a>.
(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 <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#a0c6d28ec9ced3d0c5c3d4c9cfcee0cec1d2c18ec7cfd6"><span class="__cf_email__" data-cfemail="0a6c78246364797a6f697e6365644a646b786b246d657c">[email protected]</span></a>.
Issued on June 30, 2025.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2025-12369 Filed 7-1-25; 8:45 am]
BILLING CODE 4910-13-P
</pre><script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script></body>
</html>Indexed from Federal Register on July 2, 2025.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.