2024-18-03: Electrical Power

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 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). (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, 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 Côte-Vertu 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