2023-11-01: 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 adding the following new airworthiness directive: 2023-11-01 Bombardier, Inc.: Amendment 39-22446; Docket No. FAA-2022-1662; Project Identifier MCAI-2022-00689-T. (a) Effective Date This airworthiness directive (AD) is effective August 15, 2023. (b) Affected ADs None. (c) Applicability This AD applies to Bombardier, Inc., Model BD-100-1A10 airplanes, certificated in any category, having serial numbers 20003 through 20795 inclusive, 20797 through 20812 inclusive, 20814 through 20832 inclusive, and 20834 through 20836 inclusive. (d) Subject Air Transport Association (ATA) of America Code 24, Electrical Power. (e) Unsafe Condition This AD was prompted by multiple reports of erratic electrical system status on the push button annunciators (PBAs) and the engine instrument and crew alerting system (EICAS) while on-ground and during flight. The FAA is issuing this AD to address erratic indications, which could cause the flight crew to turn off fully-operational electrical power sources, leading to partial or complete loss of electrical power. The unsafe condition, if not addressed, could result in loss of 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 Within 60 days after the effective date of this AD, verify the total flight hours of the left-hand (LH) direct current power center (DCPC) unit since the date of manufacture by doing a records check in accordance with paragraph 2.B.(1) of the Accomplishment Instructions of the applicable service bulletin identified in paragraphs (g)(1) and (2) of this AD. (1) For airplanes having serial number 20001 through 20500 inclusive, use Bombardier Service Bulletin 100-24-29, dated April 9, 2021. (2) For airplanes having serial number 20501 through 20999 inclusive, use Bombardier Service Bulletin 350-24-004, dated April 9, 2021. (h) Replacement of the LH DCPC If, during the records check required by paragraph (g) of this AD, the total flight hours since date of manufacture of the LH DCPC unit is equal to or more than 3,100 total flight hours and the LH DCPC has not been cleaned as specified in Safran Service Bulletin 975GC02Y-24-018 before the effective date of this AD: Within 19 months after the effective date of this AD, replace the LH DCPC unit in accordance with paragraphs 2.B.(2) through 2.B.(5) and 2.C. of the Accomplishment Instructions of the applicable service bulletin identified in paragraphs (g)(1) and (2) of this AD. (i) Exception to the Service Information Although the note in paragraph 2.B.(4) of the Accomplishment Instructions of Bombardier Service Bulletins 100-24-29, and 350-24-004, both dated April 9, 2021, specifies that actions will reset "the unit total flight hours to zero at date of incorporation," this AD does not include that requirement. (j) Optional Terminating Action Modification of a LH DCPC having part number (P/N) 975GC02Y07 into an LH DCPC having P/N 975GC02Y08, in accordance with Parts A and B of the Accomplishment Instructions of the applicable service bulletin identified in paragraphs (j)(1) and (2) of this AD, is considered terminating action for the requirements of paragraphs (g) and (h) of this AD for that LH DCPC. (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. (k) Additional AD Provisions The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, AIR-730, 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 ATTN: Program Manager, Continuing Operational Safety, at the address identified in paragraph (l)(2) of this AD or email to: 9-avs-nyaco-cos@faa.gov. If mailing information, also submit information by email. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (2) Contacting the Manufacturer: For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved by the Manager, 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. (l) Additional Information (1) Refer to Transport Canada AD CF-2022-28, dated May 26, 2022, for related information. This Transport Canada AD may be found in the AD docket at regulations.gov under Docket No. FAA-2022-1662. (2) For more information about this AD, contact Steven Dzierzynski, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7367; email 9-avs-nyaco-cos@faa.gov. (m) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless this AD specifies otherwise. (i) Bombardier Service Bulletin 100-24-29, dated April 9, 2021. (ii) Bombardier Service Bulletin 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. (3) For service information 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. (4) You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. (5) You may view this service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email fr.inspection@nara.gov, or go to: www.archives.gov/federal-register/cfr/ibr-locations.html. Issued on May 25, 2023. Ross Landes, Deputy Director for Regulatory Operations, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2023-14512 Filed 7-10-23; 8:45 am]BILLING CODE 4910-13-P