# Airworthiness Directives; Bombardier, Inc., Airplanes
> **Rule** · Final rule. · Published 2017-09-20 · Effective 2017-10-24 · 82 FR 43829
## Document
- **Document number:** 2017-19660
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 43829
- **Publication date:** 2017-09-20
- **Effective date:** 2017-10-24
- **FAA docket:** Docket No. FAA-2017-0334
## Abstract

We are superseding Airworthiness Directive (AD) 2014-25-01, which applied to certain Bombardier, Inc., Model DHC-8-400 series airplanes. AD 2014-25-01 required modifying the nose landing gear (NLG) trailing arm and installing a new pivot pin retention mechanism. This AD instead requires modifying the NLG shock strut assembly. This AD was prompted by reports of discrepancies of a certain bolt at the pivot pin link, resulting in corrosion of the bolt. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/09/20/2017-19660/airworthiness-directives-bombardier-inc-airplanes)
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