Proposed Rule2025-19609
Airworthiness Directives; Bombardier, Inc., Airplanes
Primary source
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Published
October 21, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to supersede Airworthiness Directive (AD) 2025-17-12, which applies to all Bombardier, Inc., Model CL-600-1A11 (600) and CL-600-2A12 (601) airplanes, and certain Model CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. AD 2025-17-12 requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. Since the FAA issued AD 2025-17-12, the FAA has determined that certain serial numbers for affected Model CL-600-2B16 (604 Variants) airplanes are not included in the applicability of AD 2025-17-12. This proposed AD would continue to require the actions specified in AD 2025-17-12 and would add airplanes to the applicability. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 90 Issue 201 (Tuesday, October 21, 2025)</title>
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[Federal Register Volume 90, Number 201 (Tuesday, October 21, 2025)]
[Proposed Rules]
[Pages 48414-48419]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-19609]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-3435; Project Identifier MCAI-2025-01602-T]
RIN 2120-AA64
Airworthiness Directives; 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)
2025-17-12, which applies to all Bombardier, Inc., Model CL-600-1A11
(600) and CL-600-2A12 (601) airplanes, and certain Model CL-600-2B16
(601-3A, 601-3R, and 604 Variants) airplanes. AD 2025-17-12 requires
[[Page 48415]]
revising the existing maintenance or inspection program, as applicable,
to incorporate new or more restrictive airworthiness limitations. Since
the FAA issued AD 2025-17-12, the FAA has determined that certain
serial numbers for affected Model CL-600-2B16 (604 Variants) airplanes
are not included in the applicability of AD 2025-17-12. This proposed
AD would continue to require the actions specified in AD 2025-17-12 and
would add airplanes to the applicability. The FAA is proposing this AD
to address the unsafe condition on these products.
DATES: The FAA must receive comments on this NPRM by November 20, 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-2025-3435; 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#dbbab8f5a2aeb79bbabea9b4f5b9b4b6b9baa9bfb2bea9f5b8b4b6"><span class="__cf_email__" data-cfemail="59383a77202c3519383c2b36773b36343b382b3d303c2b773a3634">[email protected]</span></a>; website
<a href="https://my.bombardier.com/">https://my.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: Brenda L. Buitrago, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
phone: 516-228-7300; email: <a href="/cdn-cgi/l/email-protection#2e17034f585d0340574f4d41034d415d6e484f4f00494158"><span class="__cf_email__" data-cfemail="b1889cd0c7c29cdfc8d0d2de9cd2dec2f1d7d0d09fd6dec7">[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-2025-3435;
Project Identifier MCAI-2025-01602-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
Brenda L. Buitrago, Aviation Safety Engineer, FAA, 1600 Stewart Avenue,
Suite 410, Westbury, NY 11590; phone: 516-228-7300; email: <a href="/cdn-cgi/l/email-protection#d2ebffb3a4a1ffbcabb3b1bdffb1bda192b4b3b3fcb5bda4"><span class="__cf_email__" data-cfemail="dee7f3bfa8adf3b0a7bfbdb1f3bdb1ad9eb8bfbff0b9b1a8">[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
The FAA issued AD 2025-17-12, Amendment 39-23122 (90 FR 46330,
September 26, 2025) (AD 2025-17-12), for all Bombardier, Inc., Model
CL-600-1A11 (600) and CL-600-2A12 (601) airplanes, and certain Model
CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. AD 2025-17-12
was prompted by an MCAI originated by Transport Canada, which is the
aviation authority for Canada. Transport Canada issued AD CF-2024-16,
dated May 23, 2024 (Transport Canada AD CF-2024-16), to correct an
unsafe condition.
AD 2025-17-12 requires revising the existing maintenance or
inspection program, as applicable, to incorporate new or more
restrictive airworthiness limitations. The FAA issued AD 2025-17-12 to
address new or more restrictive limitations. Failure to comply with
these new or more restrictive limitations could adversely affect the
continued airworthiness of the airplane.
Actions Since AD 2025-17-12 Was Issued
Since the FAA issued AD 2025-17-12, the FAA has determined that
certain serial numbers for affected Model CL-600-2B16 (604 Variant)
airplanes are not included in the applicability of AD 2025-17-12. Table
1 to paragraph (g)(1) of AD 2025-17-12 and table 2 to paragraph (g)(2)
of AD 2025-17-12 identify the applicable airplanes for each document by
serial numbers. For Model CL-600-2B16 (604 Variant) airplanes, the
serial numbers start at 5301. However, paragraph (c)(2) of AD 2025-17-
12 only identifies Model CL-600-2B16 (604 Variant) airplanes, serial
numbers (S/Ns) 6050 through 6192 inclusive. Therefore, the FAA is
revising the applicability of this proposed AD by adding Model CL-600-
2B16 (604 Variant) airplanes, S/Ns 5301 through 5665 inclusive and S/Ns
5701 through 6049 inclusive. The FAA has removed references to those
serial numbers from table 1 to paragraph (g)(1) of this proposed AD and
table 2 to paragraph (g)(2) of this proposed AD and added actions for
those airplanes to paragraph (i) of this proposed AD.
The FAA has also determined that the last row of table 2 to
paragraph (g)(2) of AD 2025-17-12 inadvertently lists S/N 6193 instead
of S/N 6192. Airplanes having S/N 6193 and subsequent were delivered
with Bombardier Temporary Revision No. 5-2-5, dated October 16, 2023,
and must comply with the airworthiness limitations specified as part of
the approved type design. The FAA has revised table 2 to paragraph
(g)(2) of this proposed AD accordingly.
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-2025-3435.
[[Page 48416]]
Material Incorporated by Reference Under 1 CFR Part 51
This proposed AD would require the following Bombardier material,
which the Director of the Federal Register approved for incorporation
by reference as of October 31, 2025 (90 FR 46333, September 26, 2025):
<bullet> Section 5-10-00, ``Airworthiness Limitations,'' of
Bombardier Challenger 600 Time Limits/Maintenance Checks (TLMC),
Publication No. PSP 605, Revision 39, dated January 8, 2018. (For
obtaining these sections of Bombardier Challenger 600 TLMC, Publication
No. PSP 605, use Document Identification No. CH 600 TLMC.)
<bullet> Section 5-10-00, ``Airworthiness Limitations,'' of
Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, Revision 46,
dated January 8, 2018. (For obtaining these sections of Bombardier
Challenger 601 TLMC, Publication No. PSP 601-5, use Document
Identification No. CH 601 TLMC.)
<bullet> Section 5-10-00, ``Airworthiness Limitations,'' of
Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, Revision
42, dated January 8, 2018. (For obtaining these sections of Bombardier
Challenger 601 TLMC, Publication No. PSP 601A-5, use Document
Identification No. CH 601 TLMC-1.)
<bullet> Part 2, ``Airworthiness Limitations,'' of Bombardier
Challenger 604 TLMC, Publication No. CH 604 TLMC, Revision 33, dated
November 22, 2022. (The document identification number for ordering
Bombardier Challenger 604 TLMC, Publication No. CH 604 TLMC is
incorrectly identified as ``CH 600 TLMC'' on page 2 of the TLMC. For
obtaining Part 2 of Bombardier Challenger 604 TLMC, Publication No. CH
604 TLMC, use Document Identification No. CH 604 TLMC.)
<bullet> Part 2, ``Airworthiness Limitations,'' of Bombardier
Challenger 605 TLMC, Publication No. CH 605 TLMC, Revision 22, dated
November 22, 2022.
<bullet> Part 2, ``Airworthiness Limitations,'' of Bombardier
Challenger 650 TLMC, Publication No. CH 650 TLMC, Revision 9, dated
November 22, 2022.
<bullet> Temporary Revision No. 5-2-5, dated October 16, 2023,
which includes new Task 32-51-04-101*, ``Discard of the Nosewheel-
Steering Control Potentiometer Coupling Setscrews, Part No. B0201102-2-
220 (A/C 6194 and Subs or Post SB 650-32-007).''
<bullet> Temporary Revision No. 5-2-29, dated October 25, 2023,
which includes new Task 32-51-04-101*, ``Discard of the Nosewheel-
Steering Control Potentiometer Coupling Setscrews, Part No. B0201102-2-
220 (Post SB 605-32-010).''
<bullet> Temporary Revision No. 5-2-73, dated October 25, 2023,
which includes new Task 32-51-04-101*, ``Discard of the Nosewheel-
Steering Control Potentiometer Coupling Setscrews, Part No. B0201102-2-
220 (Post SB 604-32-033).''
<bullet> Temporary Revision No. TR 5-164, dated December 23, 2022,
which includes new Task 53-10-01-102*, ``Forward Pressure Bulkhead Cap
Angle--Aft Side.''
<bullet> Temporary Revision No. TR 5-165, dated October 25, 2023.
<bullet> Temporary Revision No. TR 5-268, dated December 23, 2022,
which includes new Task 53-10-01-103*, ``Forward Pressure Bulkhead Cap
Angle--Aft Side.''
<bullet> Temporary Revision No. TR 5-269, dated October 25, 2023.
<bullet> Temporary Revision No. TR 5-282, dated December 23, 2022,
which includes new Task 53-10-01-103*, ``Forward Pressure Bulkhead Cap
Angle--Aft Side.''
<bullet> Temporary Revision No. TR 5-283, dated October 25, 2023.
(The asterisk (or ``one star'') with the last three digits of the
task numbers listed above indicates that the task is an airworthiness
limitation task.)
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 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 Requirements of This NPRM
This proposed AD would retain all of the requirements of AD 2025-
17-12. This proposed AD would also add airplanes to the applicability.
This proposed AD would require revisions to certain operator
maintenance documents to include new actions (e.g., inspections).
Compliance with these actions is required by 14 CFR 91.403(c). For
airplanes that have been previously modified, altered, or repaired in
the areas addressed by this proposed AD, the operator may not be able
to accomplish the actions described in the revisions. In this
situation, to comply with 14 CFR 91.403(c), the operator must request
approval for an alternative method of compliance according to paragraph
(l)(1) of this proposed AD.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 427 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
The FAA estimates the total cost per operator for the retained
actions from AD 2025-17-12 to be $7,650 (90 work-hours x $85 per work-
hour).
The FAA has determined that revising the maintenance or inspection
program takes an average of 90 work-hours per operator, although the
agency recognizes that this number may vary from operator to operator.
Since operators incorporate maintenance or inspection program changes
for their affected fleet(s), the FAA has determined that a per-operator
estimate is more accurate than a per-airplane estimate. Therefore, the
FAA estimates the total cost per operator for the new proposed actions
to be $7,650 (90 work-hours x $85 per work-hour).
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
[[Page 48417]]
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 2025-17-12, Amendment 39-23122 (90
FR 46330, September 26, 2025); and
0
b. Adding the following new airworthiness directive:
Bombardier, Inc.: Docket No. FAA-2025-3435; Project Identifier MCAI-
2025-01602-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by November 20, 2025.
(b) Affected ADs
This AD replaces AD 2025-17-12, Amendment 39-23122 (90 FR 46330,
September 26, 2025) (AD 2025-17-12).
(c) Applicability
This AD applies to the Bombardier, Inc., airplanes identified in
paragraphs (c)(1) through (3) of this AD, certificated in any
category.
(1) All Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-600-
2B16 (601-3A and 601-3R Variants) airplanes.
(2) Model CL-600-2B16 (604 Variant) airplanes, serial numbers
(S/Ns) 5301 through 5665 inclusive and S/Ns 5701 through 6049
inclusive.
(3) Model CL-600-2B16 (604 Variant) airplanes, S/Ns 6050 through
6192 inclusive.
(d) Subject
Air Transport Association (ATA) of America Code 05, Time Limits/
Maintenance Checks.
(e) Unsafe Condition
This AD was prompted by a determination that new or more
restrictive airworthiness limitations are necessary. The FAA is
issuing this AD to address new or more restrictive limitations.
Failure to comply with these new or more restrictive limitations
could adversely affect the continued airworthiness of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Retained Revision of the Existing Maintenance or Inspection
Program for Certain Airplanes, With Removal of References to S/Ns 5301
Through 6049 Inclusive
This paragraph restates the requirements of paragraph (g) of AD
2025-17-12, with removal of references to S/Ns 5301 through 6049
inclusive. For airplanes identified in paragraphs (c)(1) and (3) of
this AD, comply with paragraphs (g)(1) and (2) of this AD.
(1) Within 90 days after October 31, 2025 (the effective date of
AD 2025-17-12), revise the existing maintenance or inspection
program, as applicable, to incorporate the information specified in
the applicable time limits/maintenance checks (TLMC) document
identified in table 1 to paragraph (g)(1) of this AD. The initial
compliance time for doing the tasks is at the time specified in the
applicable TLMC document identified in table 1 to paragraph (g)(1)
of this AD, or within 90 days after October 31, 2025, whichever
occurs later.
Table 1 to Paragraph (g)(1)--TLMC Documents
------------------------------------------------------------------------
TLMC sections or
Applicable airplanes parts TLMC document
------------------------------------------------------------------------
Bombardier, Inc., Model CL-600- Section 5-10-00, Bombardier Challenger
1A11 (600) airplanes, serial ``Airworthiness 600 TLMC,
numbers (S/Ns) 1004 through Limitations,'' Publication No. PSP
1085 inclusive. 605, Revision 39,
January 8, 2018.\1\
Bombardier, Inc., Model CL-600- Section 5-10-00, Bombardier Challenger
2A12 (601) airplanes, S/Ns ``Airworthiness 601 TLMC,
3001 through 3066 inclusive. Limitations,'' Publication No. PSP
601[dash]5, Revision
46, January 8,
2018.\2\
Bombardier, Inc., Model CL-600- Section 5-10-00, Bombardier Challenger
2B16 (601-3A Variant) ``Airworthiness 601 TLMC,
airplanes, S/Ns 5001 through Limitations,'' Publication No. PSP
5134 inclusive; and Model CL- 601A-5, Revision 42,
600-2B16 (601-3R Variant) January 8, 2018.\3\
airplanes, S/Ns 5135 through
5194 inclusive.
Bombardier, Inc., Model CL-600- Part 2, Bombardier Challenger
2B16 (604 Variant) airplanes, ``Airworthiness 650 TLMC,
S/Ns 6050 through 6180 Limitations''. Publication No. CH
inclusive. 650 TLMC, Revision
9, November 22,
2022.
------------------------------------------------------------------------
\1\ For obtaining these sections of Bombardier Challenger 600 TLMC,
Publication No. PSP 605, use Document Identification No. CH 600 TLMC.
\2\ For obtaining these sections of Bombardier Challenger 601 TLMC,
Publication No. PSP 601-5, use Document Identification No. CH 601
TLMC.
\3\ For obtaining these sections of Bombardier Challenger 601 TLMC,
Publication No. PSP 601A-5, use Document Identification No. CH 601
TLMC-1.
(2) Within 90 days after October 31, 2025 (the effective date of
AD 2025-17-12), revise the existing maintenance or inspection
program, as applicable, to incorporate the information specified in
the applicable temporary revisions (TRs) identified in table 2 to
paragraph (g)(2) of this AD. The initial compliance time for doing
the tasks is at the time specified in the applicable TR identified
in table 2 to paragraph (g)(2) of this AD, or within 90 days after
October 31, 2025, whichever occurs later.
Table 2 to Paragraph (g)(2)--Temporary Revisions
------------------------------------------------------------------------
Task No. and Title
Applicable airplanes TR or life limit Part
No. (P/N) and name
------------------------------------------------------------------------
Bombardier, Inc., Model CL-600- Bombardier 53-10-01-102*,
1A11 (600) airplanes, S/Ns 1004 Temporary Forward Pressure
through 1085 inclusive. Revision No. TR Bulkhead Cap
5[dash]164, dated Angle--Aft Side.
December 23, 2022.
Bombardier, Inc., Model CL-600- Bombardier B0201102-2-220,
1A11 (600) airplanes, S/Ns 1004 Temporary Rudder Pedal
through 1085 inclusive. Revision No. TR Potentiometer
5[dash]165, dated Coupling
October 25, 2023. Setscrews.
Bombardier, Inc., Model CL-600- Bombardier 53-10-01-103*,
2A12 (601) airplanes, S/Ns 3001 Temporary Forward Pressure
through 3066 inclusive. Revision No. TR Bulkhead Cap
5[dash]268, dated Angle--Aft Side.
December 23, 2022.
Bombardier, Inc., Model CL-600- Bombardier B0201102-2-220,
2A12 (601) airplanes, S/Ns 3001 Temporary Rudder Pedal
through 3066 inclusive. Revision No. TR Potentiometer
5[dash]269, dated Coupling
October 25, 2023. Setscrews.
[[Page 48418]]
Bombardier, Inc., Model CL-600- Bombardier 53-10-01-103*,
2B16 (601-3A Variant) Temporary Forward Pressure
airplanes, S/Ns 5001 through Revision No. TR Bulkhead Cap
5134 inclusive; and Model CL- 5[dash]282, dated Angle--Aft Side.
600-2B16 (601-3R Variant) December 23, 2022.
airplanes, S/Ns 5135 through
5194 inclusive.
Bombardier, Inc., Model CL-600- Bombardier B0201102-2-220,
2B16 (601-3A Variant) Temporary Rudder Pedal
airplanes, S/Ns 5001 through Revision No. TR Potentiometer
5134 inclusive; and Model CL- 5[dash]283, dated Coupling
600-2B16 (601-3R Variant) October 25, 2023. Setscrews.
airplanes, S/Ns 5135 through
5194 inclusive.
Bombardier, Inc., Model CL-600- Bombardier 32-51-04-101*,
2B16 (604 Variant) airplanes, S/ Temporary Discard of the
Ns 6050 through 6192, inclusive. Revision No. Nosewheel-
5[dash]2-5, dated Steering Control
October 16, 2023. Potentiometer
Coupling
Setscrews, Part
No. B0201102-2-
220 (A/C 6194 and
Subs or Post SB
650-32-007).
------------------------------------------------------------------------
Note 1 to table 2 to paragraph (g)(2): The asterisk (or ``one
star'') with the last three digits of the task numbers listed in
table 2 to paragraph (g)(2) of this AD indicates that the task is an
airworthiness limitation task.
(h) Retained No Alternative Actions and Intervals, With No Changes
This paragraph restates the requirements of paragraph (i) of AD
2025-17-12, with no changes. After the existing maintenance or
inspection program has been revised as required by paragraph (g) of
this AD, no alternative actions (e.g., inspections) or intervals may
be used unless the actions or intervals are approved as an
alternative method of compliance (AMOC) in accordance with the
procedures specified in paragraph (l)(1) of this AD
(i) New Revision of the Existing Maintenance or Inspection Program for
Certain Airplanes
For airplanes identified in paragraph (c)(2) of this AD: Comply
with paragraphs (i)(1) and (2) of this AD.
(1) Within 90 days after the effective date of this AD, revise
the existing maintenance or inspection program, as applicable, to
incorporate the information specified in the applicable TLMC
document identified in table 3 to paragraph (i)(1) of this AD. The
initial compliance time for doing the tasks is at the time specified
in the applicable TLMC document identified in table 3 to paragraph
(i)(1) of this AD, or within 90 days after the effective date of
this AD, whichever occurs later, except as provided by paragraph (j)
of this AD.
Table 3 to Paragraph (i)(1)--TLMC Documents
------------------------------------------------------------------------
TLMC sections or
Applicable airplanes parts TLMC document
------------------------------------------------------------------------
Bombardier, Inc., Model CL-600- Part 2, Bombardier Challenger
2B16 (604 Variant) airplanes, ``Airworthiness 604 TLMC,
S/Ns 5301 through 5665 Limitations''. Publication No. CH
inclusive. 604 TLMC, Revision
33, November 22,
2022.\1\
Bombardier, Inc., Model CL-600- Part 2, Bombardier Challenger
2B16 (604 Variant) airplanes, ``Airworthiness 605 TLMC,
S/Ns 5701 through 6049 Limitations''. Publication No. CH
inclusive. 605 TLMC, Revision
22, November 22,
2022.
------------------------------------------------------------------------
\1\ The document identification number for ordering Bombardier
Challenger 604 TLMC, Publication No. CH 604 TLMC is incorrectly
identified as ``CH 600 TLMC'' on page 2 of the TLMC. For obtaining
Part 2 of Bombardier Challenger 604 TLMC, Publication No. CH 604 TLMC,
use Document Identification No. CH 604 TLMC.
(2) Within 90 days after the effective date of this AD, revise
the existing maintenance or inspection program, as applicable, to
incorporate the information specified in the applicable TRs
identified in table 4 to paragraph (i)(2) of this AD. The initial
compliance time for doing the tasks is at the time specified in the
applicable TR identified in table 4 to paragraph (i)(2) of this AD,
or within 90 days after the effective date of this AD, whichever
occurs later.
Table 4 to Paragraph (i)(2)--Temporary Revisions
------------------------------------------------------------------------
Task No. and title or
Applicable airplanes TR life limit Part No.
(P/N) and name
------------------------------------------------------------------------
Bombardier, Inc., Model CL-600- Bombardier 32-51-04-101*,
2B16 (604 Variant) airplanes, Temporary Discard of the
S/Ns 5301 through 5665 Revision No. Nosewheel-Steering
inclusive. 5[dash]2-73, Control
dated October Potentiometer
25, 2023. Coupling Setscrews,
Part No. B0201102-2-
220 (Post SB 604-32-
033).
Bombardier, Inc., Model CL-600- Bombardier 32-51-04-101*,
2B16 (604 Variant) airplanes, Temporary Discard of the
S/Ns 5701 through 6049 Revision No. Nosewheel-Steering
inclusive. 5[dash]2-29, Control
dated October Potentiometer
25, 2023. Coupling Setscrews,
Part No. B0201102-2-
220 (Post SB 605-32-
010).
------------------------------------------------------------------------
Note 2 to table 4 to paragraph (i)(2): The asterisk (or ``one
star'') with the last three digits of the task numbers listed in
table 4 to paragraph (i)(2) of this AD indicates that the task is an
airworthiness limitation task.
(j) Compliance Time Exception for a Certain Task
For airplanes identified in paragraph (c)(2) of this AD: The
initial compliance time for task 27-42-01-110, ``Special Detailed
Inspection of the Horizontal Stabilizer Trim Actuator (HSTA), P/N
604-92305-7 and Subs (Vendor P/N 8454-3 and Subs),'' of section 5-
10-40, ``Certification Maintenance Requirements,'' of Part 2,
``Airworthiness Limitations,'' of Bombardier Challenger 604 TLMC,
Publication No. CH 604 TLMC, Revision 33, dated November 22, 2022;
or Bombardier Challenger 605 TLMC, Publication No. CH 605 TLMC,
Revision 22, dated November 22, 2022; as applicable, is at the
applicable compliance time specified in paragraph (j)(1) or (2) of
this AD, or within 90 days after the effective date of this AD,
whichever occurs later.
(1) For HSTA having P/N 604-92305-3 (vendor P/N 8454-1) or P/N
604-92305-5 (vendor P/N 8454-2) that were replaced with P/N 604-
92305-7 (vendor P/N 8454-3) in accordance with paragraph (j) of AD
2015-05-07, Amendment 39-18117 (80 FR 13483, March 16, 2015): Within
12 years after accomplishing the replacement.
(2) For HSTA having P/N 604-92305-7 (vendor P/N 8454-3)
manufactured before November 1, 2015: Within 12 years from the part
entry into service.
(k) New No Alternative Actions or Intervals
After the existing maintenance or inspection program has been
revised as required by paragraph (i) of this AD, no alternative
actions (e.g., inspections) or intervals may be used unless the
actions or intervals are approved as an AMOC in accordance with the
procedures specified in paragraph (l)(1) of this AD.
[[Page 48419]]
(l) 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 (m) of this AD and email to:
<a href="/cdn-cgi/l/email-protection#a2e3efede1e2c4c3c38cc5cdd4"><span class="__cf_email__" data-cfemail="e6a7aba9a5a6808787c8818990">[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.
(m) Additional Information
For more information about this AD, contact Brenda L. Buitrago,
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="261f0b4750550b485f4745490b4549556640474708414950">[email protected]</span></a>.
(n) 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 October 31,
2025 (90 FR 46330, September 26, 2025).
(i) Section 5-10-00, ``Airworthiness Limitations,'' of
Bombardier Challenger 600 Time Limits/Maintenance Checks (TLMC),
Publication No. PSP 605, Revision 39, dated January 8, 2018.
Note 3 to paragraph (n)(3)(i): For obtaining this section of
Bombardier Challenger 600 TLMC, Publication No. PSP 605, use
Document Identification No. CH 600 TLMC.
(ii) Section 5-10-00, ``Airworthiness Limitations,'' of
Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, Revision
46, dated January 8, 2018.
Note 4 to paragraph (n)(3)(ii): For obtaining this section
Bombardier Challenger 601 TLMC, Publication No. PSP 601-5, use
Document Identification No. CH 601 TLMC.
(iii) Section 5-10-00, ``Airworthiness Limitations,'' of
Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, Revision
42, dated January 8, 2018.
Note 5 to paragraph (n)(3)(iii): For obtaining this section of
Bombardier Challenger 601 TLMC, Publication No. PSP 601A-5, use
Document Identification No. CH 601 TLMC-1.
(iv) Part 2, ``Airworthiness Limitations,'' of Bombardier
Challenger 604 TLMC, Publication No. CH 604 TLMC, Revision 33, dated
November 22, 2022.
Note 6 to paragraph (n)(3)(iv): The document identification
number for ordering Bombardier Challenger 604 TLMC, Publication No.
CH 604 TLMC is incorrectly identified as ``CH 600 TLMC'' on page 2
of the TLMC. For obtaining Part 2 of Bombardier Challenger 604 TLMC,
Publication No. CH 604 TLMC, use Document Identification No. CH 604
TLMC.
(v) Part 2, ``Airworthiness Limitations,'' of Bombardier
Challenger 605 TLMC, Publication No. CH 605 TLMC, Revision 22, dated
November 22, 2022.
(vi) Part 2, ``Airworthiness Limitations,'' of Bombardier
Challenger 650 TLMC, Publication No. CH 650 TLMC, Revision 9, dated
November 22, 2022.
(vii) Bombardier Temporary Revision No. 5-2-5, dated October 16,
2023.
(viii) Bombardier Temporary Revision No. 5-2-29, dated October
25, 2023.
(ix) Bombardier Temporary Revision No. 5-2-73, dated October 25,
2023.
(x) Bombardier Temporary Revision No. TR 5-164, dated December
23, 2022.
(xi) Bombardier Temporary Revision No. TR 5-165, dated October
25, 2023.
(xii) Bombardier Temporary Revision No. TR 5-268, dated December
23, 2022.
(xiii) Bombardier Temporary Revision No. TR 5-269, dated October
25, 2023.
(xiv) Bombardier Temporary Revision No. TR 5-282, dated December
23, 2022.
(xv) Bombardier Temporary Revision No. TR 5-283, dated October
25, 2023.
(4) 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#0e6f6d20777b624e6f6b7c61206c61636c6f7c6a676b7c206d6163"><span class="__cf_email__" data-cfemail="1c7d7f326569705c7d796e73327e73717e7d6e7875796e327f7371">[email protected]</span></a>; website
<a href="https://my.bombardier.com/">https://my.bombardier.com/</a>.
(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#e88e9ac681869b988d8b9c818786a886899a89c68f879e"><span class="__cf_email__" data-cfemail="e78195c98e8994978284938e8889a789869586c9808891">[email protected]</span></a>.
Issued on October 16, 2025.
Christopher R. Parker,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2025-19609 Filed 10-20-25; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on October 21, 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.