# Airworthiness Directives; Bombardier, Inc., Airplanes
> **Rule** · Final rule. · Published 2021-10-14 · Effective 2021-11-18 · 86 FR 57033
## Document
- **Document number:** 2021-22295
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 57033
- **Publication date:** 2021-10-14
- **Effective date:** 2021-11-18
- **FAA docket:** Docket No. FAA-2021-0462
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model CL-600-2B16 (604 Variant) airplanes. This AD was prompted by multiple reports of cracking of the main landing gear (MLG) shock strut lower pin. This AD requires repetitive lubrication and repetitive detailed visual inspections (DVI) and non- destructive test (NDT) inspections of the MLG shock strut lower pins, and replacement if necessary. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/10/14/2021-22295/airworthiness-directives-bombardier-inc-airplanes)
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