# Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes
> **Rule** · Final rule. · Published 2005-12-21 · Effective 2006-01-25 · 70 FR 75727
## Document
- **Document number:** 05-24245
- **Category:** airworthiness
- **Manufacturer:** Bombardier Model DHC-8-400 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 75727
- **Publication date:** 2005-12-21
- **Effective date:** 2006-01-25
- **FAA docket:** Docket No. FAA-2005-22403
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model DHC-8-400 series airplanes. This AD requires an inspection of the laminated shims for cracks, damage, or extrusion between the forward attachment fittings of the horizontal stabilizer and the top rib of the vertical stabilizer; a torque check of the attachment bolts in the attachment fittings of the front, middle, and rear spars; and corrective actions if necessary. This AD results from a report indicating that delaminated shims extruded from the interface between the forward attaching fittings of the horizontal stabilizer and the top rib of the vertical stabilizer, and that inadequate torque values of some bolts were found. We are issuing this AD to prevent reduced structural integrity of the horizontal stabilizer, and consequent loss of controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/12/21/05-24245/airworthiness-directives-bombardier-model-dhc-8-400-series-airplanes)
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