# Proposed AD 99-NM-63-AD: Dassault Model 2000, 900EX, and Mystere Falcon 900 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-14-07
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 3, 1999, 64 FR 23552
- Comments due: May 24, 1999
- Became: [AD 99-14-07](https://openairdocs.org/ad/99-14-07)
- Docket: 99-NM-63-AD
- FR document: 99-10962
- Official PDF: https://openairdocs.org/files/sha256/6e/4d/6e4d90a370bb7a1b0cc5519303d66ea3df4e8a123b7d19de5963995ca2dfac29 (from https://www.govinfo.gov/content/pkg/FR-1999-05-03/pdf/99-10962.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/05/03/99-10962/airworthiness-directives-dassault-model-2000-900ex-and-mystere-falcon-900-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-63-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Dassault Model Falcon 2000 series airplanes; and certain Dassault Model 900EX, and Mystere Falcon 900 series airplanes. This proposal would require 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 proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed 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.

## Notices in this docket

- May 3, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-10962, comments due May 24, 1999 (https://www.federalregister.gov/documents/1999/05/03/99-10962/airworthiness-directives-dassault-model-2000-900ex-and-mystere-falcon-900-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.