# Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes
> **Rule** · Final rule. · Published 1999-09-22 · Effective 1999-10-27 · 64 FR 51195
## Document
- **Document number:** 99-24151
- **Category:** airworthiness
- **Manufacturer:** Bombardier Model DHC-8-100 and -300 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 51195
- **Publication date:** 1999-09-22
- **Effective date:** 1999-10-27
- **FAA docket:** Docket No. 98-NM-384-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model DHC-8-100 and -300 series airplanes, that requires replacement of the main landing gear (MLG) uplock actuator on both the left and right MLG with a new redesigned uplock assembly. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of the MLG to extend when a ``gear down'' selection is made.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/22/99-24151/airworthiness-directives-bombardier-model-dhc-8-100-and--300-series-airplanes)
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