# Airworthiness Directives; Bombardier Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A and CL-601-3R) Airplanes
> **Rule** · Final rule. · Published 2005-12-21 · Effective 2006-01-25 · 70 FR 75725
## Document
- **Document number:** 05-24244
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 75725
- **Publication date:** 2005-12-21
- **Effective date:** 2006-01-25
- **FAA docket:** Docket No. FAA-2005-22627
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A and CL-601-3R) airplanes. This AD requires measuring to detect migration of the lower gimbal pin and inspecting for other discrepancies of the horizontal stabilizer trim actuator (HSTA). This AD also requires replacing or modifying the HSTA, as applicable. This AD results from reports of failure of the lower gimbal pin of the HSTA. We are issuing this AD to prevent migration of the lower gimbal pin of the HSTA, which could result in loss of the horizontal stabilizer and consequent loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/12/21/05-24244/airworthiness-directives-bombardier-model-cl-600-1a11-cl-600-cl-600-2a12-cl-601-and-cl-600-2b16)
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