Airworthiness Directives; Bombardier, Inc., Airplanes, 81329-81333 [2024-23113]

Download as PDF Federal Register / Vol. 89, No. 195 / Tuesday, October 8, 2024 / Rules and Regulations (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). ddrumheller on DSK120RN23PROD with RULES1 (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 VerDate Sep<11>2014 16:13 Oct 07, 2024 Jkt 265001 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. 81329 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 Federal Aviation Administration (FAA), DOT. ACTION: Final rule. AGENCY: 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– (l) Related Information 11–01 also provided optional (1) For more information about this AD, terminating action for the records check contact Nicole S. Tsang, Aviation Safety and replacement. This AD was Engineer, FAA, 2200 South 216th St., Des prompted by multiple reports of erratic Moines, WA 98198; telephone 206–231– electrical system status on the push 3959; email Nicole.S.Tsang@faa.gov. (2) Material identified in this AD that is not button annunciators (PBAs) and the incorporated by reference is available at the engine instrument and crew alerting address specified in paragraph (m)(3) this system (EICAS) while on-ground and AD. during flight, and by the determination (m) Material Incorporated by Reference that certain DCPC units require additional modification or replacement. (1) The Director of the Federal Register approved the incorporation by reference This AD requires checking maintenance (IBR) of the material listed in this paragraph records of certain airplanes, replacing under 5 U.S.C. 552(a) and 1 CFR part 51. certain DCPC units, and modifying (2) You must use this material as certain DCPC units. This AD also applicable to do the actions required by this expands the applicability of AD 2023– AD, unless the AD specifies otherwise. 11–01 and prohibits the installation of (i) Boeing Special Attention Requirements Bulletin B787–81205–SB250294–00 RB, Issue affected parts. The FAA is issuing this AD to address the unsafe condition on 001, dated June 14, 2023. (ii) [Reserved] these products. (3) For Boeing material identified in this DATES: This AD is effective November AD, contact Boeing Commercial Airplanes, 12, 2024. Attention: Contractual & Data Services The Director of the Federal Register (C&DS), 2600 Westminster Blvd., MC 110– SK57, Seal Beach, CA 90740–5600; telephone approved the incorporation by reference of certain publications listed in this AD 562–797–1717; website myboeingfleet.com. (4) You may view this material at the FAA, as of November 12, 2024. Airworthiness Products Section, Operational The Director of the Federal Register Safety Branch, 2200 South 216th St., Des approved the incorporation by reference Moines, WA. For information on the of certain other publications listed in availability of this material at the FAA, call this AD as of August 15, 2023 (88 FR 206–231–3195. 44042, July 11, 2023). (5) You may view this material at the National Archives and Records ADDRESSES: Administration (NARA). For information on AD Docket: You may examine the AD the availability of this material at NARA, docket at regulations.gov under Docket visit www.archives.gov/federal-register/cfr/ No. FAA–2024–1003; or in person at ibr-locations or email fr.inspection@nara.gov. Docket Operations between 9 a.m. and Issued on September 3, 2024. 5 p.m., Monday through Friday, except Peter A. White, Federal holidays. The AD docket Deputy Director, Integrated Certificate contains this final rule, the mandatory Management Division, Aircraft Certification continuing airworthiness information Service. (MCAI), any comments received, and [FR Doc. 2024–23114 Filed 10–7–24; 8:45 am] other information. The address for Docket Operations is U.S. Department of BILLING CODE 4910–13–P PO 00000 Frm 00037 Fmt 4700 Sfmt 4700 SUMMARY: E:\FR\FM\08OCR1.SGM 08OCR1 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 Côte-Vertu Road West, Dorval, Québec 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: ddrumheller on DSK120RN23PROD with RULES1 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 VerDate Sep<11>2014 16:13 Oct 07, 2024 Jkt 265001 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 PO 00000 Frm 00038 Fmt 4700 Sfmt 4700 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, E:\FR\FM\08OCR1.SGM 08OCR1 81331 Federal Register / Vol. 89, No. 195 / Tuesday, October 8, 2024 / Rules and Regulations 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 Records check ................................................ New actions (modification) .............................. 1 work-hours × $85 per hour = $85 ............... 2 work-hours × $85 per hour = $170 ............. The FAA estimates the following costs to do any necessary on-condition actions that would be required based on Cost per product Parts cost the results of any required actions. The FAA has no way of determining the $0 0 Cost on U.S. operators $85 170 $30,260 60,520 number of aircraft that might need this on-condition action: ESTIMATED COSTS OF ON-CONDITION ACTIONS Labor cost Parts cost 7 work-hours × $85 per hour = $595 ...................................................... Up to $35,000 ................................ ddrumheller on DSK120RN23PROD with RULES1 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 VerDate Sep<11>2014 16:13 Oct 07, 2024 Jkt 265001 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. PO 00000 Frm 00039 Fmt 4700 Sfmt 4700 Cost per product Up to $35,595. 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). E:\FR\FM\08OCR1.SGM 08OCR1 81332 Federal Register / Vol. 89, No. 195 / Tuesday, October 8, 2024 / Rules and Regulations (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. ddrumheller on DSK120RN23PROD with RULES1 (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 VerDate Sep<11>2014 16:13 Oct 07, 2024 Jkt 265001 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 PO 00000 Frm 00040 Fmt 4700 Sfmt 4700 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, E:\FR\FM\08OCR1.SGM 08OCR1 Federal Register / Vol. 89, No. 195 / Tuesday, October 8, 2024 / Rules and Regulations 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. ddrumheller on DSK120RN23PROD with RULES1 (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 VerDate Sep<11>2014 16:13 Oct 07, 2024 Jkt 265001 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 CôteVertu Road West, Dorval, Québec 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 Federal Aviation Administration (FAA), DOT. ACTION: Final rule. AGENCY: The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD–700–2A12 SUMMARY: PO 00000 Frm 00041 Fmt 4700 Sfmt 4700 81333 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 Côte-Vertu Road West, Dorval, Québec 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 E:\FR\FM\08OCR1.SGM 08OCR1

Agencies

[Federal Register Volume 89, Number 195 (Tuesday, October 8, 2024)]
[Rules and Regulations]
[Pages 81329-81333]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-23113]


-----------------------------------------------------------------------

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

[[Page 81330]]

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 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 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 [email protected].

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,

[[Page 81331]]

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
----------------------------------------------------------------------------------------------------------------
                                                                                     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 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 =     Up to $35,000.....  Up to $35,595.
 $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

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:

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).

[[Page 81332]]

(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,

[[Page 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-
[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

    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 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 
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 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

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.