# AD 2021-09-03: Equipment/furnishings - Type: Airworthiness directive - Status: Historical - Products: Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11 - Effective: May 4, 2021 - Published: April 19, 2021, 86 FR 20266–20269 - Issued: April 22, 2021 - Issued as: Final rule; request for comments - Superseded by: [AD 2024-22-04](https://openairdocs.org/ad/2024-22-04) - Product type: Aircraft, Large airplane - ATA chapter: 25 · Equipment and furnishings - Amendment: 39-21516 - Docket: FAA-2021-0313 (https://www.regulations.gov/docket/FAA-2021-0313) - Project: MCAI-2021-00348-T - Registered aircraft: 231 may be affected, by airframe or engine model (OpenAirDocs) - Official PDF: https://openairdocs.org/files/sha256/51/1b/511b3fdeb0ee3b67490762d19b4afcb56768b9148feeb2d36aec56299730acf1 (from https://www.govinfo.gov/content/pkg/FR-2021-04-19/pdf/2021-08052.pdf) - Federal Register: https://www.federalregister.gov/documents/2021/04/19/2021-08052/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B7B7AD9466AA3893862586BC004F2856.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/2021-09-03 ## Summary The FAA is correcting an airworthiness directive (AD) that was published in the Federal Register. That AD applies to certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. As published, two references to a Transport Canada Civil Aviation (TCCA) AD number specified in the regulatory text are incorrect. This document corrects those errors. In all other respects, the original document remains the same. ## The airworthiness directive 1. The authority citation for part 39 continues to read as follows: 2. The FAA corrects § 39.13 by revising the following airworthiness directive to read: 2021-09-03 Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.): Amendment 39-21516; Docket No. FAA-2021-0313; Project Identifier MCAI-2021-00348-T. ### (a) Effective Date This airworthiness directive (AD) becomes effective May 4, 2021. ### (b) Affected ADs None. ### (c) Applicability This AD applies to Airbus Canada Limited Partnership (type certificate previously held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Model BD-500-1A10 and BD-500-1A11 airplanes, certificated in any category, as identified in Transport Canada Civil Aviation (TCCA) AD CF-2021-10, dated March 18, 2021 (TCCA AD CF-2021-10). ### (d) Subject Air Transport Association (ATA) of America Code 25, Equipment/furnishings. ### (e) Reason This AD was prompted by reports of the failure of emergency locator transmitter (ELT) antennas. The FAA is issuing this AD to address ELT antenna failure, which can lead to the loss of the ELT antenna and the development of fuselage cracks that can result in an inability to maintain cabin pressure. ### (f) Compliance Comply with this AD within the compliance times specified, unless already done. ### (g) Requirements Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, TCCA AD CF-2021-10. ### (h) Exception to TCCA AD CF-2021-10 (1) Where TCCA AD CF-2021-10 refers to its effective date, this AD requires using the effective date of this AD. (2) Where TCCA AD CF-2021-10 refers to hours air time, this AD requires using flight hours. (3) If any damage is found as a result of the inspections required by this AD, repairs must be done before further flight. ### (i) Special Flight Permit Special flight permits may be issued in accordance with 14 CFR 21.197 and 21.199 to operate the airplane to a location where the airplane can be modified (if the operator elects to do so), provided no passengers are onboard. ### (j) Other FAA AD Provisions The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, New York ACO 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 ATTN: Program Manager, Continuing Operational Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531. 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, New York ACO Branch, FAA; or TCCA; or Airbus Canada Limited Partnership's TCCA Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature. ### (k) Related Information For more information about this AD, contact Deep Gaurav, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov. ### (l) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless this AD specifies otherwise. (3) The following service information was approved for IBR on May 4, 2021 (86 FR 20266, April 19, 2021). (i) Transport Canada Civil Aviation (TCCA) AD CF-2021-10, dated March 18, 2021. (ii) [Reserved] (4) For TCCA AD CF-2021-10, contact TCCA, Transport Canada National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888-663-3639; email AD-CN@tc.gc.ca; internet https://tc.canada.ca/en/aviation. (5) 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. This material may be found in the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-0313. (6) 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 fedreg.legal@nara.gov, or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html. ## Rule preamble ### Dates This correction is effective May 4, 2021. The effective date of AD 2021-09-03 remains May 4, 2021. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of May 4, 2021 (86 FR 20266, April 19, 2021). The date by which FAA must receive comments on this AD remains June 3, 2021. ### Addresses For material incorporated by reference (IBR) in this AD, contact TCCA, Transport Canada National Aircraft Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888-663-3639; email AD-CN@tc.gc.ca; internet https://tc.canada.ca/en/aviation. You may view this IBR 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 in the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-0313. ### For further information contact Deep Gaurav, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov. ### SUPPLEMENTARY INFORMATION AD 2021-09-03, Amendment 39-21516 (86 FR 20266, April 19, 2021) (AD 2021-09-03), requires repetitive replacements of the emergency locator transmitter (ELT) antenna and repetitive inspections for damage of the exterior fuselage skin around the ELT antenna attachment area, as specified in TCCA AD CF-2021-10, dated March 18, 2021 (TCCA AD CF-2021-10). That AD applies to certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. ### Need for the Correction As published, the TCCA AD number specified in paragraphs (h)(1) and (2) of the regulatory text of AD 2021-09-03 is incorrectly identified as “TCCA AD CF-2020-10,” where the correct identification is “TCCA AD CF-2021-10.” ### Related Service Information Under 1 CFR Part 51 TCCA AD CF-2021-10 describes procedures for repetitive replacements of the ELT antenna with a new ELT antenna and repetitive inspections of the exterior fuselage skin around the ELT antenna attachment area for damage (including cracking). 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. ### Correction of Publication This document corrects multiple errors and correctly adds the AD as an amendment to 14 CFR 39.13. Although no other part of the preamble or regulatory information has been corrected, the FAA is publishing the entire rule in the Federal Register. The effective date of this AD remains May 4, 2021. Since this action only corrects references to a TCCA AD number, it has no adverse economic impact and imposes no additional burden on any person. Therefore, the FAA has determined that notice and public procedures are unnecessary. ### Adoption of the Correction Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS T00008NY](https://openairdocs.org/tcds/T00008NY): Airbus Canada Limited Partnership; names 2 of 2 models: BD-500-1A10, BD-500-1A11 ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 231 (231 by airframe model, 0 by engine model) - Makers: Airbus Canada LP 186, Airbus Canada Ltd Ptnrsp 31, C Series Aircraft Ltd Ptnrsp 14 Models with the most aircraft: - [Airbus Canada LP BD-500-1A11](https://openairdocs.org/model/airbus-canada-lp-bd-500-1a11): 186 aircraft (airframe model) - [Airbus Canada Ltd Ptnrsp BD-500-1A10](https://openairdocs.org/model/airbus-canada-ltd-ptnrsp-bd-500-1a10): 31 aircraft (airframe model) - [C Series Aircraft Ltd Ptnrsp BD-500-1A10](https://openairdocs.org/model/c-series-aircraft-ltd-ptnrsp-bd-500-1a10): 14 aircraft (airframe model) All 3 models: https://openairdocs.org/ad/2021-09-03/models.md Every aircraft: https://openairdocs.org/ad/2021-09-03/aircraft.md ## Related documents - [AD 2024-22-04](https://openairdocs.org/ad/2024-22-04): Fuselage · Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11. Effective Dec 17, 2024. Supersedes this AD No proposed rule in this release led to it. Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.