[Federal Register Volume 89, Number 82 (Friday, April 26, 2024)]
[Proposed Rules]
[Pages 32380-32384]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-08347]


 ========================================================================
 Proposed Rules
                                                 Federal Register
 ________________________________________________________________________
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 This section of the FEDERAL REGISTER contains notices to the public of 
 the proposed issuance of rules and regulations. The purpose of these 
 notices is to give interested persons an opportunity to participate in 
 the rule making prior to the adoption of the final rules.
 
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 

  Federal Register / Vol. 89 , No. 82 / Friday, April 26, 2024 / 
Proposed Rules  

[[Page 32380]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-1003; Project Identifier MCAI-2023-00712-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 supersede Airworthiness Directive (AD) 
2023-11-01, which applies to certain Bombardier, Inc., Model BD-100-
1A10 airplanes. AD 2023-11-01 requires a records check and replacement 
of affected left-hand (LH) direct current power center (DCPC) units. AD 
2023-11-01 also provides optional terminating action for the records 
check and replacement. However, it has been determined that certain LH 
DCPC units require additional modification. This proposed AD would 
require checking maintenance records of certain airplanes, replacing 
certain DCPC units, and modifying certain DCPC units. This proposed AD 
would also expand the applicability of AD 2023-11-01. This proposed AD 
would also prohibit the installation of affected parts. 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 June 10, 
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-2024-1003; 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 C[ocirc]te-
Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; telephone 514-
855-2999; email bombardier.com">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; 
telephone 516-228-7300; email [email protected].

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-2024-1003; Project Identifier 
MCAI-2023-00712-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; telephone 516-228-7300; email [email protected]. Any commentary that the FAA receives which is not 
specifically designated as CBI will be placed in the public docket for 
this rulemaking.

Background

    The FAA issued AD 2023-11-01, Amendment 39-22446 (88 FR 44042, July 
11, 2023) (AD 2023-11-01), for certain Bombardier, Inc., Model BD-100-
1A10 airplanes. AD 2023-11-01 was prompted by an MCAI originated by 
Transport Canada, which is the aviation authority for Canada. Transport 
Canada issued AD CF-2022-28, dated May 26, 2022 (Transport Canada AD 
CF-2022-28), to correct an unsafe condition.
    AD 2023-11-01 requires a records check and replacement of affected 
LH DCPC units, and provides optional terminating action for those 
actions. The FAA issued AD 2023-11-01 to address erratic indications, 
which could cause the flightcrew 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 flight displays and reduced controllability of the airplane.

[[Page 32381]]

Actions Since AD 2023-11-01 Was Issued

    The preamble to AD 2023-11-01 explains that the FAA considers the 
requirements ``interim action'' and was considering further rulemaking. 
The FAA has now determined that further rulemaking is indeed necessary, 
and this NPRM follows from that determination.
    Transport Canada superseded AD CF-2022-28, dated May 26, 2022 
(Transport Canada AD CF-2022-28), and issued Transport Canada AD CF-
2023-35, dated May 26, 2023 (Transport Canada AD CF-2023-35) (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 
airplanes could experience misleading electrical system status 
indications (push button annunciators (PBA) and engine indicating and 
crew alerting system (EICAS)) as a result of contamination of 
electrical contacts in the LH DCPC internal communication data bus. 
These erratic indications could cause the flightcrew 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 retains the requirement to verify the airplane records, 
requires removal of certain LH DCPC units for cleaning, and requires 
modification of certain LH DCPC units by adding a protective layer of 
tape to prevent the ingress of contaminants into the printed circuit 
board cage. The MCAI also prohibits installation of affected parts. 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-2024-1003.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed Bombardier Service Bulletins 100-24-29 and 350-24-
004, both Revision 01, both dated July 27, 2023. 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, and 975GC02Y07). These 
documents are distinct since they apply to different airplane 
configurations.
    The following documents specify procedures for removing LH DCPC 
units.
     Task 24-61-01-000-801, Removal of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/Installation, 
Bombardier Challenger 300 Aircraft Maintenance Manual, Part Two--
Publication No. CH 300 AMM, Revision 82, dated November 9, 2023. (For 
obtaining the task for the Bombardier Challenger 300 Aircraft 
Maintenance Manual, Part Two--Publication No. CH 300 AMM, use Document 
Identification No. CH 300 AMM.)
     Task 24-61-01-000-801, Removal of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/Installation, 
Bombardier Challenger 350 Aircraft Maintenance Manual, Part Two--
Publication No. CH 350 AMM, Revision 38, dated November 9, 2023. (For 
obtaining the task for the Bombardier Challenger 350 Aircraft 
Maintenance Manual, Part Two--Publication No. CH 350 AMM, use Document 
Identification No. CH 350 AMM.)
    The following documents specify procedures for installing LH DCPC 
units.
     Task 24-61-01-400-801, Installation of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/Installation, 
Bombardier Challenger 300 Aircraft Maintenance Manual, Part Two--
Publication No. CH 300 AMM, Revision 82, dated November 9, 2023. (For 
obtaining the task for the Bombardier Challenger 300 Aircraft 
Maintenance Manual, Part Two--Publication No. CH 300 AMM, use Document 
Identification No. CH 300 AMM.)
     Task 24-61-01-400-801, Installation of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/Installation, 
Bombardier Challenger 350 Aircraft Maintenance Manual, Part Two--
Publication No. CH 350 AMM, Revision 38, dated November 9, 2023. (For 
obtaining the task for the Bombardier Challenger 350 Aircraft 
Maintenance Manual, Part Two--Publication No. CH 350 AMM, use Document 
Identification No. CH 350 AMM.)
    The following documents specify procedures for testing LH DCPC 
units.
     Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24, 61-01, DC Power Center (DCPC), Adjustment/
Test, Bombardier Challenger 300 Aircraft Maintenance Manual, Part Two--
Publication No. CH 300 AMM, Revision 82, dated November 9, 2023. (For 
obtaining the task for the Bombardier Challenger 300 Aircraft 
Maintenance Manual, Part Two--Publication No. CH 300 AMM, use Document 
Identification No. CH 300 AMM.)
     Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24, 61-01, DC Power Center (DCPC), Adjustment/
Test, Bombardier Challenger 350 Aircraft Maintenance Manual, Part Two--
Publication No. CH 350 AMM, Revision 38, dated November 9, 2023. (For 
obtaining the task for the Bombardier Challenger 350 Aircraft 
Maintenance Manual, Part Two--Publication No. CH 350 AMM, use Document 
Identification No. CH 350 AMM.)
    This proposed AD would also require the following service 
information, which the Director of the Federal Register approved for 
incorporation by reference as of August 15, 2023 (88 FR 44042, July 11, 
2023).
     Bombardier Service Bulletin 100-24-29, dated April 9, 
2021.
     Bombardier Service Bulletin 100-24-30, dated November 29, 
2022.
     Bombardier Service Bulletin 350-24-004, dated April 9, 
2021.
     Bombardier Service Bulletin 350-24-005, dated November 29, 
2022.
    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 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 expand the applicability of AD 2023-11-01 
and require the actions specified in the service information described 
previously, except as discussed under ``Differences Between this 
Proposed AD and the MCAI.''

Differences Between This Proposed AD and the MCAI

    Although the MCAI only requires LH DCPC P/N 975GC02Y07 that have 
been cleaned or replaced to be modified to P/N 975GC02Y08, this 
proposed AD would also require that LH DCPC P/N 975GC02Y04, 975GC02Y05, 
and 975GC02Y06 that have been cleaned or replaced, as required by 
Transport

[[Page 32382]]

Canada AD CF-2022-28 (which corresponds to AD 2023-11-01), to be 
replaced with LH DCPC P/N 975GC02Y08.
    Additionally, although the MCAI only requires the test of the DCPC 
logic and protections after modification of P/N 975GC02Y07 that have 
been cleaned or replaced, as required by Transport Canada AD CF-2022-
28, to P/N 975GC02Y08, this proposed AD also requires the functional 
test of the LH DCPC unit.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 356 airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Records check.........................  1 work-hours x $85 per                $0             $85         $30,260
                                         hour = $85.
New proposed actions (modification)...  2 work-hours x $85 per                 0             170          60,520
                                         hour = $170.
----------------------------------------------------------------------------------------------------------------

    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
----------------------------------------------------------------------------------------------------------------
7 work-hours x $85 per hour = $595......  Up to $35,000.....................  Up to $35,595.
----------------------------------------------------------------------------------------------------------------

    According to the manufacturer, some or all of the costs of this 
proposed AD may be covered under warranty, thereby reducing the cost 
impact on affected individuals. The FAA does not control warranty 
coverage for affected individuals. As a result, the FAA has included 
all known costs in the cost estimate.

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 has 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) Will not affect intrastate aviation in Alaska, and
    (3) Will 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 (AD) 2023-11-01, Amendment 39-22446 
(88 FR 44042, July 11, 2023); and
0
b. Adding the following new AD:

Bombardier, Inc.: Docket No. FAA-2024-1003; Project Identifier MCAI-
2023-00712-T.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by June 10, 2024.

(b) Affected ADs

    This AD replaces AD 2023-11-01, Amendment 39-22446 (88 FR 44042, 
July 11, 2023) (AD 2023-11-01).

(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 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, and by the determination that certain direct current 
power center (DCPC) units require additional modification or 
replacement. The FAA is issuing this AD to address erratic 
indications, which could cause the flightcrew 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 flight displays and reduced controllability 
of the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

[[Page 32383]]

(g) Records Check

    For any left-hand (LH) DCPC unit having part number (P/N) 
975GC02Y04, 975GC02Y05, 975GC02Y06, or 975GC02Y07 that was not 
cleaned before the effective date of this AD as specified in Safran 
Service Bulletin 975GC02Y-24-018 or replaced before the effective 
date of this AD as specified in Bombardier Service Bulletin 100-24-
29 or Bombardier Service Bulletin 350-24-004: Within 60 days after 
the effective date of this AD, verify the total flight hours of the 
LH 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 numbers 20001 through 20500 
inclusive, use Bombardier Service Bulletin 100-24-29, dated April 9, 
2021, or Revision 01, dated July 27, 2023. As of the effective date 
of this AD, use only Bombardier Service Bulletin 100-24-29, Revision 
01, dated July 27, 2023.
    (2) For airplanes having serial numbers 20501 through 20999 
inclusive, use Bombardier Service Bulletin 350-24-004, dated April 
9, 2021, or Revision 01, dated July 27, 2023. As of the effective 
date of this AD, use only Bombardier Service Bulletin 350-24-004, 
Revision 01, dated July 27, 2023.

(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 3,500 total flight hours as of the 
effective date of this AD, and the LH DCPC was not previously 
cleaned as specified in Safran Service Bulletin 957GC02Y-24-018, or 
replaced as specified in Bombardier Service Bulletin 100-24-29 or 
Bombardier Service Bulletin 350-24-004: Within 12 months after the 
effective date of this AD, remove, replace with LH DCPC P/N 
975GC02Y08, test the DCPC logic and protection cards, and do the 
functional test for the LH DCPC unit, in accordance with the 
applicable service information specified in paragraphs (h)(1) 
through (8) of this AD. If any test fails, do corrective actions and 
repeat the test before further flight until the test passes.
    (1) Task 24-61-01-000-801, Removal of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation, Bombardier Challenger 300 Aircraft Maintenance Manual, 
Part Two--Publication No. CH 300 AMM, Revision 82, dated November 9, 
2023.
    (2) Task 24-61-01-000-801, Removal of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation, Bombardier Challenger 350 Aircraft Maintenance Manual, 
Part Two--Publication No. CH 350 AMM, Revision 38, dated November 9, 
2023.
    (3) Task 24-61-01-400-801, Installation of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation, Bombardier Challenger 300 Aircraft Maintenance Manual, 
Part Two--Publication No. CH 300 AMM, Revision 82, dated November 9, 
2023.
    (4) Task 24-61-01-400-801, Installation of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation, Bombardier Challenger 350 Aircraft Maintenance Manual, 
Part Two--Publication No. CH 350 AMM, Revision 38, dated November 9, 
2023.
    (5) For airplanes having serial number 20001 through 20500 
inclusive, use paragraph 2.D. of the Accomplishment Instructions of 
Bombardier Service Bulletin 100-24-30, dated November 29, 2022.
    (6) For airplanes having serial number 20501 through 20999 
inclusive, use paragraph 2.D. of the Accomplishment Instructions of 
Bombardier Service Bulletin 350-24-005, dated November 29, 2022.
    (7) Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24-61-01, DC Power Center (DCPC), Adjustment/
Test, Bombardier Challenger 300 Aircraft Maintenance Manual, Part 
Two--Publication No. CH 300 AMM, Revision 82, dated November 9, 
2023.
    (8) Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24-61-01, DC Power Center (DCPC), Adjustment/
Test, Bombardier Challenger 350 Aircraft Maintenance Manual, Part 
Two--Publication No. CH 350 AMM, Revision 38, dated November 9, 
2023.

(i) Exception to the Service Information

    Although the note in paragraph 2.B.(4) of the Accomplishment 
Instructions of Bombardier Service Bulletin 100-24-29, dated April 
9, 2021, and Revision 01, dated July 27, 2023, and Bombardier 
Service Bulletin 350-24-004, dated April 9, 2021, and Revision 01, 
dated July 27, 2023, specify that actions will reset ``the unit 
total flight hours to zero at date of incorporation,'' this AD does 
not include that requirement.

(j) Modification

    For LH DCPC P/N 975GC02Y07 units that were cleaned before the 
effective date of this AD as specified in Safran Service Bulletin 
975GC02Y-24-018, or replaced before the effective date of this AD as 
specified in Bombardier Service Bulletin 100-24-29 or Bombardier 
Service Bulletin 350-24-004: Within 12 months after the effective 
date of this AD, modify each LH DCPC P/N 975GC02Y07 into LH DCPC P/N 
975GC02Y08, in accordance with paragraph 2.C. of the Accomplishment 
Instructions of the applicable service bulletin identified in 
paragraph (j)(1) or (2) of this AD. Before further flight after the 
modification, test the DCPC logic and protection cards in accordance 
with paragraph 2.D. of the Accomplishment Instructions of the 
applicable service bulletin identified in paragraph (j)(1) or (2) of 
this AD, and do the functional test for the LH DCPC unit, in 
accordance with the applicable service information specified in 
paragraphs (j)(3) or (4) of this AD. If any test fails, do 
corrective actions and repeat the test before further flight until 
the test passes.
    (1) For airplanes having serial number 20001 through 20500 
inclusive, use Bombardier Service Bulletin 100-24-30, dated November 
29, 2022.
    (2) For airplanes having serial number 20501 through 20999 
inclusive, use Bombardier Service Bulletin 350-24-005, dated 
November 29, 2022.
    (3) Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24-61-01, DC Power Center (DCPC), Adjustment/
Test, Bombardier Challenger 300 Aircraft Maintenance Manual, Part 
Two--Publication No. CH 300 AMM, Revision 82, dated November 9, 
2023.
    (4) Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24-61-01, DC Power Center (DCPC), Adjustment/
Test, Bombardier Challenger 350 Aircraft Maintenance Manual, Part 
Two--Publication No. CH 350 AMM, Revision 38, dated November 9, 
2023.

(k) Replacement of Certain LH DCPC P/N 975GC02Y04, 975GC02Y05, and 
975GC02Y06

    For LH DCPC P/N 975GC02Y04, 975GC02Y05, and 975GC02Y06 that were 
cleaned before the effective date of this AD as specified in Safran 
Service Bulletin 975GC02Y-24-018, or replaced before the effective 
date of this AD as specified in Bombardier Service Bulletin 100-24-
29 or Bombardier Service Bulletin 350-24-004: Within 12 months after 
the effective date of this AD, remove, replace with LH DCPC P/N 
975GC02Y08, test the DCPC logic and protection cards, and do the 
functional test for the LH DCPC unit, in accordance with the 
applicable service information specified in paragraphs (h)(1) 
through (8) of this AD. If any test fails, do corrective actions and 
repeat the test before further flight until the test passes.

(l) Parts Installation Prohibition

    As of 60 days from the effective date of this AD, it is 
prohibited to install a LH DCPC with P/N 975GC02Y04, 975GC02Y05, 
975GC02Y06, or 975GC02Y07, on any airplane.

(m) Additional AD Provisions

    (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 the address identified 
in paragraph (n)(2) of this AD. Information may be emailed to: 9-
[email protected].
    (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.

(n) Additional Information

    (1) Refer to Transport Canada AD CF-2023-35, dated May 26, 2023, 
for related information. This Transport Canada AD may be found in 
the AD docket at regulations.gov under Docket No. FAA-2024-1003.

[[Page 32384]]

    (2) For more information about this AD, contact Steven 
Dzierzynski, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, 
Suite 410, Westbury, NY 11590; telephone 516-228-7300; email [email protected].

(o) 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.
    (3) The following service information was approved for IBR on 
[DATE 35 DAYS AFTER PUBLICATION OF THE FINAL RULE].
    (i) Bombardier Service Bulletin 100-24-29, Revision 01, dated 
July 27, 2023.
    (ii) Bombardier Service Bulletin 350-24-004, Revision 01, dated 
July 27, 2023.
    (iii) Bombardier Challenger 300 Aircraft Maintenance Manual, 
Part Two, Publication No. CH 300 AMM, Revision 82, dated November 9, 
2023.
    (A) Task 24-61-01-000-801, Removal of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation.
    Note 1 to paragraph (o)(3)(iii)(A): For obtaining the tasks 
specified in paragraphs (o)(3)(iii)(A) through (C) of this AD for 
the Bombardier Challenger 300 Aircraft Maintenance Manual, Part Two, 
Publication No. CH 300 AMM, use Document Identification No. CH 300 
AMM.
    (B) Task 24-61-01-400-801, Installation of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation.
    (C) Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24, 61-01, DC Power Center (DCPC), 
Adjustment/Test.
    (iv) Bombardier Challenger 350 Aircraft Maintenance Manual, Part 
Two, Publication No. CH 350 AMM, Revision 38, dated November 9, 
2023.
    (A) Task 24-61-01-000-801, Removal of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation.
    Note 2 to paragraph (o)(3)(iv)(A): For obtaining the tasks 
specified in paragraphs (o)(3)(iv)(A) through (C) of this AD for the 
Bombardier Challenger 350 Aircraft Maintenance Manual, Part Two--
Publication No. CH 350 AMM, use Document Identification No. CH 350 
AMM.
    (B) Task 24-61-01-400-801, Installation of the DC Power Center 
(DCPC), Subject 24-61-01, DC Power Center (DCPC), Removal/
Installation.
    (C) Task 24-61-01-720-801, Functional Test of the DC Power 
Center (DCPC), Subject 24, 61-01, DC Power Center (DCPC), 
Adjustment/Test.
    (4) The following service information was approved for IBR on 
August 15, 2023 (88 FR 44042, July 11, 2023).
    (i) Bombardier Service Bulletin 100-24-29, dated April 9, 2021.
    (ii) Bombardier Service Bulletin 100-24-30, dated November 29, 
2022.
    (iii) Bombardier Service Bulletin 350-24-004, dated April 9, 
2021.
    (iv) Bombardier Service Bulletin 350-24-005, dated November 29, 
2022.
    (5) For service information 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 bombardier.com">ac.yul@aero.bombardier.com; website 
bombardier.com.
    (6) 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.
    (7) You may view this material at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].

    Issued on April 15, 2024.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2024-08347 Filed 4-25-24; 8:45 am]
BILLING CODE 4910-13-P