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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2023-1706; Project Identifier MCAI-2023-00039-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    September 25, 2023.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to the Bombardier, Inc.,  airplanes,  certificated  in
    any category, identified in paragraphs (c)(1) through (6) of this AD.

(1) Model BD-700-1A10 airplanes, as identified in Bombardier Service Bull-
    etin 700-32-044, Revision 01, dated December 7, 2022.

(2) Model BD-700-1A10 airplanes, as identified in Bombardier Service Bull-
    etin 700-32-6021, Revision 01, dated December 7, 2022.

(3) Model BD-700-1A10 airplanes, as identified in Bombardier Service Bull-
    etin 700-32-6507, Revision 01, dated December 7, 2022.

(4) Model BD-700-1A11 airplanes, as identified in Bombardier Service Bull-
    etin 700-1A11-32-031, Revision 01, dated December 7, 2022.

(5) Model BD-700-1A11 airplanes, as identified in Bombardier Service Bull-
    etin 700-32-5021, Revision 01, dated December 7, 2022.

(6) Model BD-700-1A11 airplanes, as identified in Bombardier Service Bull-
    etin 700-32-5507, Revision 01, dated December 7, 2022.

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD was prompted by reports that the nose wheel steering  selector
    valve  (SSV)  can  be   slow  to  deactivate  under   low  temperature
    conditions. The FAA is issuing  this AD to address a  possible delayed
    transition  to  free  caster  mode in  the  event  of  an un-commanded
    steering input. The unsafe  condition, if not addressed,  could result
    in an aircraft runway excursion.

(f) COMPLIANCE

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

(g) REQUIRED ACTION

    Within 66 months  or 3,200 flight hours,  whichever occurs first after
    the effective date of this AD: Replace SSV part number (P/N) 23600-101
    with SSV P/N 23600-103 in accordance  with the Accomplishment Instruc-
    tions of the applicable Bombardier service bulletin listed in figure 1
    to paragraph (g) of this AD.
    ______________________________________________________________________
           FIGURE 1 TO PARAGRAPH (G)  SERVICE BULLETIN REFERENCES        
    ______________________________________________________________________
       MODEL          BOMBARDIER SERVICE BULLETIN         ISSUE DATE
    ______________________________________________________________________
    BD-700-1A10       700-32-044, Revision 01           December 7, 2022
    BD-700-1A10       700-32-6021, Revision 01          December 7, 2022
    BD-700-1A10       700-32-6507, Revision 01          December 7, 2022
    BD-700-1A11       700-1A11-32-031, Revision 01      December 7, 2022
    BD-700-1A11       700-32-5021, Revision 01          December 7, 2022
    BD-700-1A11       700-32-5507, Revision 01          December 7, 2022
    ______________________________________________________________________

(h) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit  for actions required by  paragraph (g)
    of this AD, if those actions were performed before the effective  date
    of this AD using the applicable Bombardier service bulletin listed  in
    figure 2 to paragraph (h) of this AD.
    ______________________________________________________________________
             FIGURE 2 TO PARAGRAPH (H)  CREDIT SERVICE BULLETINS         
    ______________________________________________________________________
       MODEL          BOMBARDIER SERVICE BULLETIN         ISSUE DATE
    ______________________________________________________________________
    BD-700-1A10               700-32-044               November 24, 2022
    BD-700-1A10               700-32-6021              November 24, 2022
    BD-700-1A10               700-32-6507              November 24, 2022
    BD-700-1A11               700-1A11-32-031          November 24, 2022
    BD-700-1A11               700-32-5021              November 24, 2022
    BD-700-1A11               700-32-5507              November 24, 2022
    ______________________________________________________________________

(i) ADDITIONAL AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, International
    Validation Branch, FAA,  has the authority  to approve AMOCs  for this
    AD,  if  requested  using the  procedures found  in 14  CFR 39.19.  In
    accordance with  14 CFR  39.19, send  your request  to your  principal
    inspector or responsible Flight  Standards Office, as appropriate.  If
    sending  information  directly  to the  manager  of  the International
    Validation  Branch,  mail  it  to  ATTN:  Program  Manager, Continuing
    Operational Safety, at the  address identified in paragraph  (j)(2) of
    this   AD  or   email  to:   9-AVS-AIR-730-AMOC@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.

(j) ADDITIONAL INFORMATION

(1) Refer to Transport Canada AD CF-2023-02,  dated January 11, 2023,  for
    related information. This Transport Canada  AD may be found in  the AD
    docket at regulations.gov under Docket No. FAA-2023-1706.

(2) For more information about this AD,  contact  Chirayu Gupta,  Aviation
    Safety Engineer,  FAA,  1600 Stewart Avenue,  Suite 410,  Westbury, NY
    11590; telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.

(k) 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 700-32-044, Revision 01, dated December 7,
    2022.

(ii) Bombardier Service Bulletin 700-32-6021, Revision 01,  dated December
     7, 2022.

(iii) Bombardier Service Bulletin 700-32-6507, Revision 01, dated December
      7, 2022.

(iv) Bombardier Service Bulletin 700-1A11-32-031 Revision 01, dated Decem-
     ber 7, 2022.

(v) Bombardier Service Bulletin 700-32-5021 Revision 01, dated December 7,
    2022.

(vi) Bombardier Service Bulletin 700-32-5507, Revision 01,  dated December
     7, 2022.

(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 service information  that is incorporated by refer-
    ence at the National Archives and Records Administration  (NARA).  For
    information on the availability of this material  at  NARA,  email fr.
    inspection@nara.gov,  or go to: www.archives.gov/federal-register/cfr/
    ibr-locations.html.

Issued on August 1, 2023.  Victor Wicklund, Deputy Director,  Compliance &
Airworthiness Division, Aircraft Certification Service.

DATES: The FAA must receive comments on this proposed AD  by September 25,
2023.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-1706; Project Identifier MCAI-2023-00039-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 BD-700-1A10 and BD-700-1A11
airplanes. This proposed AD was prompted by reports that the nose wheel
steering selector valve (SSV) can be slow to
deactivate under low temperature conditions. This proposed AD would
require replacing the affected SSV with a re-designed SSV that has an
improved response time. 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 September
25, 2023.

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-2023-1706; 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 Bombardier, Inc., 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: Chirayu Gupta, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 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-2023-1706; Project Identifier
MCAI-2023-00039-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
Chirayu Gupta, Aviation Safety Engineer, FAA, 1600 Stewart Avenue,
Suite 410, Westbury, NY 11590; telephone 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-2023-02, dated January 11, 2023 (TC AD
CF-2023-02) (also referred to after this as the MCAI), to correct an
unsafe condition on certain Bombardier, Inc., Model BD-700-1A10 and BD-
700-1A11 airplanes. The MCAI states that following a runway excursion
on a different model, an investigation revealed that the nose wheel SSV
can be slow to deactivate under low temperature conditions. A similar
SSV is installed on the airplanes to which this AD is applicable. In
the event of an un-commanded steering input, a slow SSV deactivation
could lead to a delayed transition to free caster mode and result in an
aircraft runway excursion.
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-2023-1706.

Related Service Information Under 1 CFR Part 51

The FAA reviewed the following Bombardier service information.
Service Bulletin 700-32-044, Revision 01, dated December
7, 2022.
Service Bulletin 700-32-6021, Revision 01, dated December
7, 2022.
Service Bulletin 700-32-6507, Revision 01, dated December
7, 2022.
Service Bulletin 700-1A11-32-031, Revision 01, dated
December 7, 2022.
Service Bulletin 700-32-5021, Revision 01, dated December
7, 2022.
Service Bulletin 700-32-5507, Revision 01, dated December
7, 2022.
This service information specifies procedures for replacing the
affected SSV with a re-designed SSV. 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.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 442 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
4 work-hours x $85 per hour = $340
$5,542
$5,882
Up to $2,599,844

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: