# Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
> **Rule** · Final rule. · Published 2021-08-05 · Effective 2021-09-09 · 86 FR 42696
## Document
- **Document number:** 2021-16563
- **Category:** airworthiness
- **Manufacturer:** Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 42696
- **Publication date:** 2021-08-05
- **Effective date:** 2021-09-09
- **FAA docket:** Docket No. FAA-2021-0019
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500- 1A11 airplanes. This AD was prompted by reports of deficiencies in the primary flight control computer (PFCC) software and the remote electronics unit (REU) software. This AD requires installation of a software update to correct deficiencies in the PFCC and REU software, as specified in a Transport Canada Civil Aviation (TCCA) 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/2021/08/05/2021-16563/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c)
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