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(g) Required Actions 

For airplanes with an original certificate of 

airworthiness or original export certificate of 

airworthiness issued on or before the 

effective date of this AD, with a seat 

assembly having Boeing part number (P/N) 

S632Z301–21 (Ipeco P/N 3A380–0007–01–7) 

installed on the captain’s side: Except as 

specified by paragraph (h) of this AD, at the 

applicable times specified in the 

‘‘Compliance’’ paragraph of Boeing Special 

Attention Requirements Bulletin B787– 

81205–SB250294–00 RB, Issue 001, dated 

June 14, 2023, do all applicable actions 

identified in, and in accordance with, the 

Accomplishment Instructions of Boeing 

Special Attention Requirements Bulletin 

B787–81205–SB250294–00 RB, Issue 001, 

dated June 14, 2023. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Special Attention 

Service Bulletin B787–81205–SB250294–00, 

Issue 001, dated June 14, 2023, which is 

referred to in Boeing Special Attention 

Requirements Bulletin B787–81205– 

SB250294–00 RB, Issue 001, dated June 14, 

2023. 

(h) Exceptions to Service Bulletin 

Specifications 

(1) Where the Boeing Recommended 

Compliance Time column of the table in the 

‘‘Compliance’’ paragraph of Boeing Special 

Attention Requirements Bulletin B787– 

81205–SB250294–00 RB, Issue 001, dated 

June 14, 2023, refers to the Issue 001 date of 

Requirements Bulletin B787–81205– 

SB250294–00 RB, this AD requires using the 

effective date of this AD. 

(2) Where Boeing Special Attention 

Requirements Bulletin B787–81205– 

SB250294–00 RB, Issue 001, dated June 14, 

2023, specifies replacement with captain’s 

seat assemblies having Boeing P/N 

S632Z301–31 (Ipeco P/N 3A380–0007–01–8), 

this AD requires installing that part number 

or a later-approved part number. Laterapproved part numbers are only those that 

are approved as a replacement for the 

applicable captain’s seat assembly and are 

approved as part of the type design by the 

FAA or The Boeing Company Organization 

Designation Authorization (ODA) after June 

14, 2023 (the issuance date of Boeing Special 

Attention Requirements Bulletin B787– 

81205–SB250294–00 RB, Issue 001). 

(i) Terminating Action for Certain 

Requirements of AD 2016–19–04 

Replacement of the captain’s seat assembly 

as required by paragraph (g) of this AD 

terminates the requirements of paragraph 

(h)(1) of AD 2016–19–04, for that captain’s 

seat assembly only. 

(j) Parts Installation Prohibition 

As of the effective date of this AD, no 

person may install a captain’s seat assembly, 

having Boeing P/N S632Z301–21 (Ipeco P/N 

3A380–0007–01–7), on any airplane. 

(k) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, AIR–520, Continued 

Operational Safety 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 certification office, 

send it to the attention of the person 

identified in paragraph (l)(1) of this AD. 

Information may be emailed to: AMOC@

faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair, 

modification, or alteration required by this 

AD if it is approved by The Boeing Company 

ODA that has been authorized by the 

Manager, AIR–520, Continued Operational 

Safety Branch, FAA, to make those findings. 

To be approved, the repair method, 

modification deviation, or alteration 

deviation must meet the certification basis of 

the airplane, and the approval must 

specifically refer to this AD. 

(l) Related Information 

(1) For more information about this AD, 

contact Nicole S. Tsang, Aviation Safety 

Engineer, FAA, 2200 South 216th St., Des 

Moines, WA 98198; telephone 206–231– 

3959; email Nicole.S.Tsang@faa.gov. 

(2) Material identified in this AD that is not 

incorporated by reference is available at the 

address specified in paragraph (m)(3) this 

AD. 

(m) 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 the AD specifies otherwise. 

(i) Boeing Special Attention Requirements 

Bulletin B787–81205–SB250294–00 RB, Issue 

001, dated June 14, 2023. 

(ii) [Reserved] 

(3) For Boeing material identified in this 

AD, contact Boeing Commercial Airplanes, 

Attention: Contractual & Data Services 

(C&DS), 2600 Westminster Blvd., MC 110– 

SK57, Seal Beach, CA 90740–5600; telephone 

562–797–1717; website myboeingfleet.com. 

(4) 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. 

(5) 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 fr.inspection@nara.gov. 

Issued on September 3, 2024. 

Peter A. White, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2024–23114 Filed 10–7–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–1003; Project 

Identifier MCAI–2023–00712–T; Amendment 

39–22837; AD 2024–18–03] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2023–11– 

01, which applied to certain 

Bombardier, Inc., Model BD–100–1A10 

airplanes. AD 2023–11–01 required a 

records check and replacement of 

affected left-hand (LH) direct current 

power center (DCPC) units. AD 2023– 

11–01 also provided optional 

terminating action for the records check 

and replacement. 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 DCPC units require 

additional modification or replacement. 

This AD requires checking maintenance 

records of certain airplanes, replacing 

certain DCPC units, and modifying 

certain DCPC units. This AD also 

expands the applicability of AD 2023– 

11–01 and prohibits the installation of 

affected parts. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective November 

12, 2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of November 12, 2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain other publications listed in 

this AD as of August 15, 2023 (88 FR 

44042, July 11, 2023). 

ADDRESSES: 

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 final rule, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 


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81330 Federal Register / Vol. 89, No. 195 / Tuesday, October 8, 2024 / Rules and Regulations 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

Material Incorporated by Reference: 

• For Bombardier material identified 

in this AD, contact Bombardier Business 

Aircraft Customer Response Center, 400 

Coˆte-Vertu Road West, Dorval, Que ́bec 

H4S 1Y9, Canada; telephone 514–855– 

2999; email ac.yul@

aero.bombardier.com; website 

bombardier.com. 

• 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. 

It is also available at regulations.gov 

under Docket No. FAA–2024–1003. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email 9-avsnyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2023–11–01, 

Amendment 39–22446 (88 FR 44042, 

July 11, 2023) (AD 2023–11–01). AD 

2023–11–01 applied to certain 

Bombardier, Inc., Model BD–100–1A10 

airplanes. AD 2023–11–01 required a 

records check and replacement of 

affected LH DCPC units, and provided 

optional terminating action for those 

actions. The FAA issued AD 2023–11– 

01 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 resulting in loss 

of flight displays and reduced 

controllability of the airplane. 

The NPRM published in the Federal 

Register on April 26, 2024 (89 FR 

32380). The NPRM was prompted by 

AD CF–2023–35, dated May 26, 2023, 

issued by Transport Canada, which is 

the aviation authority for Canada 

(Transport Canada AD CF–2023–35) 

(also referred to as the MCAI). The 

MCAI states 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. 

In the NPRM, the FAA proposed to 

continue to require checking the 

airplane records and replacement of 

affected LH DCPC units. The NPRM also 

proposed to require modification of 

certain LH DCPC units, prohibit 

installation of affected parts, and 

expand the applicability of AD 2023– 

11–01. The FAA is issuing 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. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from 

Bombardier, Inc. (Bombardier), who also 

stated its support for the NPRM. The 

following presents the comment 

received on the NPRM and the FAA’s 

response to that comment. 

Request To Extend the Compliance 

Time 

Bombardier requested that the 

proposed AD be revised to extend the 

proposed compliance time to March 31, 

2026. Bombardier asserted that, due to 

changes made in the airplane flight 

manual (AFM), which introduced the 

‘‘Unexpected Electrical Indications’’ 

procedure instructing pilots not to act 

on erratic indications related to the 

electrical power generation and 

distribution system, the medium risk 

was mitigated and the severity of a 

misleading indication event was 

lowered from potentially catastrophic to 

major. Even if such events still occur 

after the implementation of Bombardier 

Service Bulletins 100–24–30 and 350– 

24–005, following implementation of 

the AFM revision, Bombardier considers 

these events a reliability issue and 

stated its commitment to work with the 

supplier to correct the effects of such 

events. Bombardier further asserted that, 

when analyzed in conjunction with the 

probability of occurrence, the risk 

becomes low. Additionally, Bombardier 

attested that, based on its provisions, a 

shorter compliance time will create 

additional pressure on the U.S. 

operators, exposing them to a potential 

grounding scenario, necessitating the 

need for Bombardier to apply for an 

alternative method of compliance 

(AMOC) to support this AD. 

The FAA disagrees with the request. 

Bombardier provided no substantiating 

data to support the need for an 

extension of the proposed compliance 

time. In developing an appropriate 

compliance time for this action, the 

FAA considered the safety implications, 

the time necessary to accomplish the 

required actions, the availability of 

required parts, and normal maintenance 

schedules for timely accomplishment of 

the required actions. Considering these 

items, the FAA has determined that the 

specified compliance time, as proposed, 

is appropriate to ensure an acceptable 

level of safety. The FAA has not 

changed this AD because of this 

comment. However, under the 

provisions of paragraph (m)(1) of this 

AD, the FAA will consider requests for 

approval of alternative compliance 

times if sufficient data are submitted to 

substantiate that the change would 

provide an acceptable level of safety. 

Conclusion 

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 referenced above. The FAA 

reviewed the relevant data, considered 

the comment received, and determined 

that air safety requires adopting this AD 

as proposed. Accordingly, the FAA is 

issuing this AD to address the unsafe 

condition on this product. Except for 

minor editorial changes, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Material Incorporated by Reference 

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 material 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 FAA also reviewed Subject 24– 

61–01 DC Power Center (DCPC)— 

Removal/Installation, Chapter 24— 

Electrical Power, Bombardier Challenger 

300 Aircraft Maintenance Manual, Part 

Two, Publication No. CH 300 AMM, 

Revision 82, dated November 9, 2023, 

which specifies: 

• procedures for removing DCPC 

units in Task 24–61–01–000–801 

Removal of the DC Power Center 

(DCPC); 

• procedures for installing DCPC 

units in Task 24–61–01–400–801 

Installation of the DC Power Center 

(DCPC); and 

• procedures for testing DCPC units 

in Task 24–61–01–720–801 Functional 

Test of the DC Power Center (DCPC). 

For obtaining these tasks for the 

Bombardier Challenger 300 Aircraft 

Maintenance Manual, Part Two, 


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Publication No. CH 300 AMM, use 

Document Identification No. CH 300 

AMM. 

The FAA also reviewed Subject 24– 

61–01 DC Power Center (DCPC)— 

Removal/Installation, Chapter 24— 

Electrical Power, Bombardier Challenger 

350 Aircraft Maintenance Manual, Part 

Two, Publication No. CH 300 AMM, 

Revision 38, dated November 9, 2023, 

which specifies: 

• procedures for removing DCPC 

units in Task 24–61–01–000–801 

Removal of the DC Power Center 

(DCPC); 

• procedures for installing DCPC 

units in Task 24–61–01–400–801 

Installation of the DC Power Center 

(DCPC); and 

• procedures for testing DCPC units 

in Task 24–61–01–720–801 Functional 

Test of the DC Power Center (DCPC). 

For obtaining these tasks for the 

Bombardier Challenger 350 Aircraft 

Maintenance Manual, Part Two, 

Publication No. CH 350 AMM, use 

Document Identification No. CH 350 

AMM. 

This AD would also require the 

following material, 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 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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 356 airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Records check ................................................ 1 work-hours × $85 per hour = $85 ............... $0 $85 $30,260 

New actions (modification) .............................. 2 work-hours × $85 per hour = $170 ............. 0 170 60,520 

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 × $85 per hour = $595 ...................................................... Up to $35,000 ................................ Up to $35,595. 

According to the manufacturer, some 

or all of the costs of this AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. The FAA does not control 

warranty coverage for affected operators. 

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 

This AD will not have federalism 

implications under Executive Order 

13132. This AD will 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 that this AD: 

(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 Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 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. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by: 

■ a. Removing Airworthiness Directive 

(AD) 2023–11–01, Amendment 39– 

22446 (88 FR 44042, July 11, 2023); and 

■ b. Adding the following new AD: 

2024–18–03 Bombardier, Inc.: Amendment 

39–22837; Docket No. FAA–2024–1003; 

Project Identifier MCAI–2023–00712–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective November 12, 2024. 

(b) Affected ADs 

This AD replaces AD 2023–11–01, 

Amendment 39–22446 (88 FR 44042, July 11, 

2023) (AD 2023–11–01). 


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(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. 

(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, Chapter 24—Electrical Power, 

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, Chapter 24—Electrical Power, 

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, Chapter 24—Electrical Power, 

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, Chapter 24—Electrical Power, 

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, Chapter 24—Electrical 

Power, 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, Chapter 24—Electrical 

Power, 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 paragraph (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, Chapter 24—Electrical 

Power, 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, Chapter 24—Electrical 

Power, 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 material specified in paragraphs 

(h)(1) through (8) of this AD. If any test fails, 


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Federal Register / Vol. 89, No. 195 / Tuesday, October 8, 2024 / Rules and Regulations 81333 

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 an 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) of this AD. Information may be 

emailed to: 9-AVS-NYACO-COS@faa.gov. 

(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 

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 9-avs-nyaco-cos@faa.gov. 

(o) 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 November 12, 2024. 

(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) Subject 24–61–01 DC Power Center 

(DCPC)—Removal/Installation, Chapter 24— 

Electrical Power, 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); 

(B) Task 24–61–01–400–801 Installation 

of the DC Power Center (DCPC); and 

(C) Task 24–61–01–720–801 Functional 

Test of the DC Power Center (DCPC). 

Note 1 to paragraph (o)(3)(iii): For 

obtaining the tasks specified in the 

Bombardier Challenger 300 Aircraft 

Maintenance Manual, Part Two, Publication 

No. CH 300 AMM, use Document 

Identification No. CH 300 AMM. 

(iv) Subject 24–61–01 DC Power Center 

(DCPC)—Removal/Installation, Chapter 24— 

Electrical Power, 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); 

(B) Task 24–61–01–400–801 Installation 

of the DC Power Center (DCPC); and 

(C) Task 24–61–01–720–801 Functional 

Test of the DC Power Center (DCPC). 

Note 2 to paragraph (o)(3)(iv): For 

obtaining the tasks specified in the 

Bombardier Challenger 350 Aircraft 

Maintenance Manual, Part Two, Publication 

No. CH 350 AMM, use Document 

Identification No. CH 350 AMM. 

(4) The following material 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 Bombardier material identified in 

this AD, contact Bombardier Business 

Aircraft Customer Response Center, 400 CoˆteVertu Road West, Dorval, Que ́bec H4S 1Y9, 

Canada; telephone 514–855–2999; email 

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 fr.inspection@nara.gov. 

Issued on September 3, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–23113 Filed 10–7–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–0227; Project 

Identifier MCAI–2023–00886–T; Amendment 

39–22838; AD 2024–18–04] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc., Model BD–700–2A12 

airplanes. This AD was prompted by a 

report indicating that the fan in a 

transformer rectifier unit (TRU) can 

become inoperative in a manner that is 

not detectable by the fan monitoring 

circuit. This AD requires replacement of 

the existing TRU Number 2 with a new 

part number that incorporates a 

correction to the fan and the monitoring 

circuit. This AD also prohibits the 

installation of affected parts. The FAA 

is issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective November 

12, 2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of November 12, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2024–0227; 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 final rule, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

Material Incorporated by Reference: 

• For Bombardier material identified 

in this AD, contact Bombardier Business 

Aircraft Customer Response Center, 400 

Coˆte-Vertu Road West, Dorval, Que ́bec 

H4S 1Y9, Canada; telephone 514–855– 

2999; email ac.yul@

aero.bombardier.com; website 

bombardier.com. 

• 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. 

It is also available at regulations.gov 

under Docket No. FAA–2024–0227. 

FOR FURTHER INFORMATION CONTACT: 

William Reisenauer, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email 9-avsnyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to certain Bombardier, Inc., Model 

BD–700–2A12 airplanes. The NPRM 

published in the Federal Register on 

February 14, 2024 (89 FR 11228). The 


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