# Airworthiness Directives; Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 Series Airplanes
> **Rule** · Final rule. · Published 2006-08-25 · Effective 2006-09-29 · 71 FR 50331
## Document
- **Document number:** E6-13966
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 71 FR 50331
- **Publication date:** 2006-08-25
- **Effective date:** 2006-09-29
- **FAA docket:** Docket No. FAA-2006-24979
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model DHC-8-100, DHC-8-200, DHC-8-300, and DHC-8-400 series airplanes. This AD requires inspecting the left and right control column torque tube assemblies to determine the type of rivets installed and replacing incorrect or indeterminate type rivets with the correct type rivets. This AD results from a report that incorrect rivets having lower than required strength were installed on the control column torque tube during production. We are issuing this AD to prevent shear failure of control column torque tube rivets, which could cause unexpected decoupling of the elevators and large unwanted deflection of the free elevator, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/08/25/E6-13966/airworthiness-directives-bombardier-model-dhc-8-100-dhc-8-200-dhc-8-300-and-dhc-8-400-series)
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