# Airworthiness Directives; Bombardier, Inc., Airplanes
> **Rule** · Final rule; request for comments. · Published 2023-08-07 · Effective 2023-08-23 · 88 FR 52021
## Document
- **Document number:** 2023-16648
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 88 FR 52021
- **Publication date:** 2023-08-07
- **Effective date:** 2023-08-23
- **FAA docket:** Docket No. FAA-2023-1654
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2023-12- 20, which applied to certain Bombardier, Inc., Model CL-600-2B16 (604 Variant) airplanes. AD 2023-12-20 required replacing certain oxygen system hoses and prohibited installing affected oxygen hoses. Since the FAA issued AD 2023-12-20, the FAA has learned of an error in a required compliance time. This AD retains the requirements of AD 2023-12-20, with a revised compliance time for the replacement. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/08/07/2023-16648/airworthiness-directives-bombardier-inc-airplanes)
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