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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2023-2402; Project Identifier MCAI-2023-00370-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    February 12, 2024.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc., Model CL-600-2B16 (601-3A, 601-3R
    and 604 Variants) airplanes, certificated in any category, with serial
    numbers 5301 through 5665 inclusive, 5701 through 5990 inclusive,  and
    6050 and subsequent.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 32, Landing gear.

(e) UNSAFE CONDITION

    This AD was prompted  by a report indicating  that a new filter  plate
    connector for the nose wheel steering (NWS) system electronic  control
    module (ECM) does not meet certain certification requirements. The FAA
    is  issuing  this  AD  to  address  this  non-compliant  filter  plate
    connector, which, if  not replaced, could  result in a  malfunction of
    the  NWS  system  causing potential  uncommanded  steering  or lateral
    excursion from the runway.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) VERIFICATION OF AIRPLANE TECHNICAL RECORDS

    Within 24  months after  the effective  date of  this AD:  Inspect the
    serial number of the ECM, P/N 601-86100-27, in accordance with Section
    2.B.  Part  A of  the  Accomplishment Instructions  of  the applicable
    service information listed in figure  (1) to the introductory text  of
    paragraph (g) of this AD to determine if the serial number of the ECM,
    part number (P/N) 601-86100-27, is  listed in Table 1 of  Section 1.A.
    of the  applicable service  information listed  in figure  (1) to  the
    introductory text of paragraph (g) of this AD. A review of maintenance
    records is  also acceptable  if the  serial number  of the  ECM can be
    conclusively determined from that review.
    ______________________________________________________________________
       MODEL        SERIAL NUMBERS        APPLICABLE BOMBARDIER SERVICE
                                                     BULLETIN
    ______________________________________________________________________
    CL-600-2B16   6050 and subsequent   650-32-006, dated October 18, 2021
    CL-600-2B16   5701 through 5990     605-32-009, dated October 18, 2021
    CL-600-2B16   5301 through 5665     604-32-032, dated October 18, 2021
    ______________________________________________________________________

(1) If the serial number of the ECM is listed  in Table 1  of Section 1.A.
    of the applicable  service information or  is not reidentified  on the
    nameplate as SB-1, then  the actions of paragraph  (h) of this AD  are
    required.

(2) If the serial number of the ECM is not listed in Table 1 of Section 1.
    A. of the applicable service information  or  is  reidentified  on the
    nameplate as SB-1,  then  the  actions of paragraph (h) of this AD are
    not required.

(h) REPLACEMENT

    For  airplanes  identified in  paragraph  (g)(1) of  this  AD: Do  the
    actions specified in paragraphs (h)(1) and (2) of this AD.

(1) Within 24 months after the effective date of this AD: Replace the ECM,
    P/N  601-86100-27,  identified  in paragraph  (g)(1)  of  this AD,  in
    accordance with Section 2.C. Part B of the Accomplishment Instructions
    of  the  applicable service  information  listed in  figure  1 to  the
    introductory text of paragraph (g) of this AD.

(2) Prior to return to service,  complete the operational test  of the NWS
    system in accordance with Section 2.D.  of the Accomplishment Instruc-
    tions of the applicable service information  listed in figure 1 to the
    introductory text of paragraph (g) of this AD.

(i) PARTS INSTALLATION LIMITATION

    As of the effective date of this AD,  it is prohibited to install ECM,
    P/N 601-86100-27,  as  a  replacement part,  if  the  serial number is
    listed in Table 1  of Section 1.A.  of the applicable service informa-
    tion listed in figure 1  to the introductory text  of paragraph (g) of
    this AD,  unless  the  ECM has been reidentified with SB-1 on the name
    plate.

(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, International  Validation
    Branch, mail it to the address identified in paragraph (k)(2) of  this
    AD or email to: 9-avs-nyaco-cos@faa.gov. If mailing information,  also
    submit information by  email. 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,  Inc.'s
    Transport Canada  Design Approval  Organization (DAO).  If approved by
    the DAO, the approval must include the DAO-authorized signature.

(k) ADDITIONAL INFORMATION

(1) Refer to Transport Canada AD CF-2023-14R1, dated May 15, 2023, for re-
    lated information.  This Transport Canada AD  may be found  in  the AD
    docket at regulations.gov under Docket No. FAA-2023-2402.

(2) For more information about this AD,  contact Steven Dzierzynski, Avia-
    tion Safety Engineer,  FAA,  1600 Stewart Avenue, Suite 410, Westbury,
    NY 11590; phone: (516) 228-7300; email: 9-avs-nyaco-cos@faa.gov.

(l) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference  (IBR)  of the service information  listed in this paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information as applicable  to do the actions
    required by this AD, unless this AD specifies otherwise.

(i) Bombardier Service Bulletin 604-32-032, dated October 18, 2021.

(ii) Bombardier Service Bulletin 605-32-009, dated October 18, 2021.

(iii) Bombardier Service Bulletin 650-32-006, dated October 18, 2021.

(3) For service information identified in this AD, contact Bombardier Bus-
    iness Aircraft  Customer  Response  Center,  400 Cote-Vertu Road West,
    Dorval, Quebec H4S 1Y9, Canada;  telephone 514-855-2999; email ac.yul@
    aero.bombardier.com; website bombardier.com.

(4) You may view this service information at the FAA,  Airworthiness Prod-
    ucts 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 Admin-
    istration (NARA). For information on the availability of this material
    at NARA,  visit www.archives.gov/federal-register/cfr/ibr-locations or
    email fr.inspection@nara.gov.

Issued on December 21, 2023.  Caitlin Locke,  Director,  Compliance & Air-
worthiness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on this proposed AD  by February 12,
2024.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-2402; Project Identifier MCAI-2023-00370-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 certain Bombardier, Inc., Model CL-600-2B16 (601-3A, 601-3R, and
604 Variants) airplanes. This proposed AD was prompted by a report
indicating that a new filter plate connector for the nose wheel
steering (NWS) system electronic control module (ECM) does not meet
certain certification requirements. This proposed AD would require
replacing all affected non-compliant ECMs. 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 February
12, 2024.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to regulations.gov. Follow
the instructions for submitting comments.
Fax: 202-493-2251.
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.
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 regulations.gov under
Docket No. FAA-2023-2402; 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

For service information identified in this NPRM, contact
Bombardier Business Aircraft Customer Response Center, 400 Cote-
Vertu Road West, Dorval, Quebec H4S 1Y9, Canada; telephone 514-
855-2999; email ac.yul@aero.bombardier.com; website bombardier.com.
You may view this service information 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: Steven Dzierzynski, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
phone: (516) 228-7300; email: 9-avs-nyaco-cos@faa.gov.

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 ADDRESSES. Include ``Docket No. FAA-2023-2402; Project Identifier
MCAI-2023-00370-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
regulations.gov, 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
Steven Dzierzynski, Aviation Safety Engineer, FAA, 1600 Stewart Avenue,
Suite 410, Westbury, NY 11590; phone: (516) 228-7300; email: 9-avs-nyaco-cos
@faa.gov. Any commentary that the FAA receives which 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-2023-14R1, dated May 15, 2023 (Transport
Canada AD CF-2023-14R1) (also referred to after this as the MCAI), to
correct an unsafe condition on certain Bombardier, Inc., Model CL-600-
2B16 (601-3A, 601-3R, and 604 Variants) airplanes. The MCAI states that
the manufacturer of the NWS system ECM, part number (P/N) 601-86100-27,
introduced a new filter plate connector that does not meet the
certification requirements related to the susceptibility of electronic
components to high intensity radiated field. This non-compliant filter
plate connector, if not replaced, could result in a malfunction of the
NWS system causing potential un-commanded steering or lateral excursion
from the runway.
The FAA is proposing 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-2023-2402.

Related Service Information Under 1 CFR Part 51

The FAA reviewed the following Bombardier service information.
Service Bulletin 604-32-032, dated October 18, 2021.
Service Bulletin 605-32-009, dated October 18, 2021.
Service Bulletin 650-32-006, dated October 18, 2021.
This service information specifies procedures for removing and
replacing all affected non-compliant ECMs, P/N 601-86100-27. These
documents are distinct since they apply to different airplane
configurations.
This service information 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 service information 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 service information already described. This proposed AD would
also prohibit the installation of affected parts under certain
conditions.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 164 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
6 work-hours x $85 per hour = $510
$75,972
$76,482
$12,543,048

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

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]

2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive: