# Airworthiness Directives; Bombardier Inc. Model Otter DHC-3 Airplanes
> **Rule** · Final rule. · Published 2004-03-01 · Effective 2004-04-20 · 69 FR 9523
## Document
- **Document number:** 04-4373
- **Category:** airworthiness
- **Manufacturer:** Bombardier Inc. Model Otter DHC-3
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 9523
- **Publication date:** 2004-03-01
- **Effective date:** 2004-04-20
- **FAA docket:** Docket No. 2000-CE-73-AD
## Abstract

The FAA adopts a new airworthiness directive (AD) for certain Bombardier Inc. (formerly deHavilland Inc.) Model Otter DHC-3 airplanes that have turbine engines installed per one of three supplemental type certificates (STC). This AD prohibits you from operating any affected airplane with these engine and propeller configurations unless a new STC for an elevator servo-tab with a redundant control linkage is installed. This AD is the result of reports of the control rod to the elevator servo-tab system detaching from the elevator servo-tab, which caused the elevator servo-tab to flutter on airplanes with a turbine engine installed. We are issuing this AD to prevent a single failure of the elevator servo-tab system, which could cause severe tab flutter. This failure could lead to possible loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/03/01/04-4373/airworthiness-directives-bombardier-inc-model-otter-dhc-3-airplanes)
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