preamble attached >>>
ADs updated daily at www.Tdata.com
PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2022-1662; Project Identifier MCAI-2022-00689-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    February 27, 2023.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc., Model BD-100-1A10 airplanes, cer-
    tificated in any category,  having  serial  number 20003 through 20795
    inclusive,  20797 through 20812 inclusive,  20814 through 20832 inclu-
    sive, and 20834 through 20836 inclusive.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 24, Electrical Power.

(e) UNSAFE CONDITION

    This AD was prompted by multiple reports of erratic electrical  system
    status  on  the  push  button  annunciators  (PBAs)  and  the   engine
    instrument and crew alerting system (EICAS) while on-ground and during
    flight. The  FAA is  issuing this  AD to  address erratic indications,
    which  could  cause  the flight  crew  to  turn off  fully-operational
    electrical  power  sources, leading  to  partial or  complete  loss of
    electrical power. The unsafe condition, if not addressed, could result
    in  loss  of electrical  power  could result  in  the loss  of  flight
    displays and reduced controllability of the airplane.

(f) COMPLIANCE

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

(g) RECORDS CHECK

    Within 60 days after the effective  date of this AD, verify the  total
    flight hours of the left-hand (LH) direct current power center  (DCPC)
    unit  since  the date  of  manufacture by  doing  a records  check  in
    accordance with paragraph  2.B.(1) of the  Accomplishment Instructions
    of the applicable service bulletin identified in paragraphs (g)(1) and
    (2) of this AD.

(1) For airplanes having serial number 20001 through 20500 inclusive,  use
    Bombardier Service Bulletin 100-24-29, dated April 9, 2021.

(2) For airplanes having serial number 20501 through 20999 inclusive,  use
    Bombardier Service Bulletin 350-24-004, dated April 9, 2021.

(h) REPLACEMENT OF THE LH DCPC

    If, during the records check required by paragraph (g) of this AD, the
    total flight hours since  date of manufacture of  the LH DCPC unit  is
    equal to or more than 3,100 total flight hours and the LH DCPC has not
    been cleaned as specified  in Safran Service Bulletin  975GC02Y-24-018
    before  the effective  date of  this AD:  Within 19  months after  the
    effective date of this AD, replace the LH DCPC unit in accordance with
    paragraphs  2.B.(2) through  2.B.(5)  and  2.C. of  the Accomplishment
    Instructions  of  the   applicable  service  bulletin   identified  in
    paragraphs (g)(1) and (2) of this AD.

(i) EXCEPTION TO THE SERVICE INFORMATION

    Although the note in paragraph 2.B.(4)  of the Accomplishment Instruc-
    tions of Bombardier Service Bulletins 100-24-29, and 350-24-004,  both
    dated April 9, 2021, specifies that actions will reset "the unit total
    flight hours to zero at date of incorporation,"  this AD  does not in-
    clude that requirement.

(j) ADDITIONAL AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager,  New York ACO
    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 New York ACO  Branch, mail
    it to  ATTN: Program  Manager, Continuing  Operational Safety,  at the
    address identified in paragraph (k)(1)  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,  New York  ACO
    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-2022-28,  dated May 26, 2022,  for re-
    lated information.  This  Transport Canada AD  may be found  in the AD
    docket at regulations.gov under Docket No. FAA-2022-1662.

(2) For more information about this AD,  contact Steven Dzierzynski, Aero-
    space Engineer,  Avionics & Electrical Systems Section,  FAA, New York
    ACO Branch, 1600 Stewart Avenue, Suite 410,  Westbury, NY 11590; tele-
    phone 516-228-7367; 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 100-24-29, dated April 9, 2021.

(ii) Bombardier Service Bulletin 350-24-004, dated April 9, 2021.

(3) For Bombardier service information identified in this AD, contact Bom-
    bardier Business Aircraft Customer Response Center, 400 Cote-Vertu Rd.
    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 January 2, 2023.  Christina Underwood,  Acting Director, Compli-
ance & Airworthiness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on this proposed AD  by February 27,
2023.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-1662; Project Identifier MCAI-2022-00689-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-100-1A10 airplanes. This
proposed AD was prompted by multiple reports of
erratic electrical system status on the push button annunciators (PBAs)
and the engine instrument and crew alerting system (EICAS) while on-
ground and during flight. This proposed AD would require a records
check and replacement of affected left-hand (LH) direct current power
center (DCPC) units. 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
27, 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-2022-1662; 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 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, Aerospace
Engineer, Avionics & Electrical Systems Section, FAA, New York ACO
Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone
516-228-7367; 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-2022-1662; Project Identifier
MCAI-2022-00689-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, Aerospace Engineer, Avionics & Electrical Systems
Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone 516-228-7367; 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-2022-28, dated June 9, 2022 (Transport
Canada AD CF-2022-28) (also referred to after this as the MCAI), to
correct an unsafe condition on certain Bombardier, Inc., Model BD-100-
1A10 airplanes. The MCAI states there have been multiple reports of
erratic electrical system status on the PBAs and the EICAS while on-
ground and during flight, and in several cases, leading to momentary
loss of electrical power and loss of flight displays following flight
crew responses to the erratic statuses. It was found that airplanes
could experience misleading electrical system status indications (PBA
and EICAS) as a result of contamination of electrical contacts in the
LH DCPC internal communication data bus. Those erratic indications
could cause the crew to turn off fully-operational electrical power
sources, leading to partial or complete loss of electrical power. Loss
of electrical power could result in the loss of flight displays and
reduced controllability of the airplane.
The MCAI also stated that Transport Canada previously issued CF-
2020-46, dated November 17, 2020 (which corresponds to FAA AD 2021-23-
14, Amendment 39-21812 (86 FR 68889, December 6, 2021)), which mandated
the use of revised Electrical Emergency and Non-Normal Procedures in
the airplane flight manual that directed crews not to turn off active
generators in the event of an erroneous electrical system status
indication. The MCAI advised that further corrective action is being
developed to introduce a design improvement to the DCPC that is
intended to protect the internal communication data bus from
contaminants, and that a time-limited maintenance check will also be
implemented.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2022-1662.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Bombardier Service Bulletins 100-24-29 and 350-24-
004, both dated April 9, 2021. This service information specifies
procedures for a records check to determine the total flight hours and
replacement of affected LH DCPC units (part numbers 975GC02Y04,
975GC0Y05, 975GC02Y06, or 975GC02Y07). 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 described 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, except as discussed under
``Differences Between this NPRM and the MCAI or Service Information.''

Differences Between This NPRM and the MCAI or Service Information

The note to paragraph 2.B.(4) in Bombardier Service Bulletins 100-
24-29 and 350-24-004, both dated April 9, 2021, specifies to reset the
unit total flight hours to zero at date of incorporation. This proposed
AD would not require that action.

Interim Action


The FAA considers that this proposed AD would be an interim action.
The MCAI states that further corrective action is being developed. Once
this action is developed, approved, and available, the FAA might
consider additional rulemaking.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 315 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
1 work-hours x $85 per hour = $85
$0
$85
$26,775

The FAA estimates the following costs to do any necessary on-
condition actions 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
8 work-hours x $85 per hour = $680
Up to $35,000
Up to $35,680

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: