# Airworthiness Directives; Dassault Model Mystere-Falcon 900, Falcon 900EX, and Falcon 2000 Series Airplanes
> **Rule** · Final rule. · Published 1999-09-15 · Effective 1999-10-20 · 64 FR 49969
## Document
- **Document number:** 99-23475
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 49969
- **Publication date:** 1999-09-15
- **Effective date:** 1999-10-20
- **FAA docket:** Docket No. 99-NM-11-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Dassault Model Mystere-Falcon 900, Falcon 900EX, and Falcon 2000 series airplanes, that requires replacement of the elevator auxiliary artificial feel unit (AFU) with a new elevator auxiliary AFU. 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 failure of the elevator auxiliary AFU. Failure of an AFU, coupled with a control linkage disconnection upstream of the servo actuator and downstream of the main AFU, could result in reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/15/99-23475/airworthiness-directives-dassault-model-mystere-falcon-900-falcon-900ex-and-falcon-2000-series)
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