# Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes
> **Rule** · Final rule. · Published 1999-09-22 · Effective 1999-10-27 · 64 FR 51199
## Document
- **Document number:** 99-24148
- **Category:** airworthiness
- **Manufacturer:** Bombardier Model DHC-8-100 and -300 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 51199
- **Publication date:** 1999-09-22
- **Effective date:** 1999-10-27
- **FAA docket:** Docket No. 97-NM-58-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model DHC-8-100 and -300 series airplanes, that requires modification of certain hydraulic systems that provide hydraulic pressure for the control of the rudder and for the main landing gear brakes. 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 damage to certain hydraulic system components in the number 2 engine nacelle, which could result in loss of the number 1 and number 2 hydraulic systems, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/22/99-24148/airworthiness-directives-bombardier-model-dhc-8-100-and--300-series-airplanes)
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