# Airworthiness Directives; Dassault Model 2000, 900EX, and Mystere Falcon 900 Series Airplanes
> **Rule** · Final rule. · Published 1999-07-07 · Effective 1999-08-11 · 64 FR 36561
## Document
- **Document number:** 99-17061
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 36561
- **Publication date:** 1999-07-07
- **Effective date:** 1999-08-11
- **FAA docket:** Docket No. 99-NM-63-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all Dassault Model Falcon 2000 series airplanes; and certain Dassault Model 900EX, and Mystere Falcon 900 series airplanes, that requires repetitive operational tests of the flap asymmetry detection system to verify proper functioning, and repair, if necessary; repetitive replacement of the inboard flap jackscrews with new jackscrews; repetitive measurement of the screw/nut play to detect discrepancies; and corrective action, if necessary. 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 jamming of the flap jackscrews, which could result in the inability to move the flaps or an asymmetric flap condition, and consequent reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/07/07/99-17061/airworthiness-directives-dassault-model-2000-900ex-and-mystere-falcon-900-series-airplanes)
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