# Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
> **Rule** · Final rule. · Published 2024-11-12 · Effective 2024-12-17 · 89 FR 88878
## Document
- **Document number:** 2024-25977
- **Category:** airworthiness
- **Manufacturer:** Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 89 FR 88878
- **Publication date:** 2024-11-12
- **Effective date:** 2024-12-17
- **FAA docket:** Docket No. FAA-2024-0464
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2021-09- 03, which applied to certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500-1A11 airplanes. AD 2021-09-03 required repetitive replacements of the emergency locator transmitter (ELT) antenna and repetitive inspections of the exterior fuselage skin around the ELT antenna attachment area. This AD was prompted by a report that there was an in-service failure of an ELT antenna that occurred before the repetitive replacement interval required by AD 2021-09-03, and that a terminating action was developed. This AD continues to require the actions in AD 2021-09-03 and requires replacement of the ELT antenna with a new ELT antenna, inspection of the exterior fuselage skin around the ELT antenna attachment holes, and repair if necessary; as specified in a Transport Canada AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/11/12/2024-25977/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)
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