# Airworthiness Directives; Bombardier, Inc., Airplanes
> **Rule** · Final rule. · Published 2021-08-05 · Effective 2021-09-09 · 86 FR 42701
## Document
- **Document number:** 2021-16565
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 42701
- **Publication date:** 2021-08-05
- **Effective date:** 2021-09-09
- **FAA docket:** Docket No. FAA-2020-1181
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL- 600-2B16 (601-3A, 601-3R and 604 Variants) airplanes. This AD was prompted by reports of corrosion on the passenger door internal structure of in-service airplanes. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/08/05/2021-16565/airworthiness-directives-bombardier-inc-airplanes)
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