# Proposed AD 2000-NM-291-AD: Dassault Model Mystere-Falcon 900 and Falcon 900EX Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-12-09
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 30, 2000, 65 FR 64636
- Comments due: November 29, 2000
- Became: [AD 2001-12-09](https://openairdocs.org/ad/2001-12-09)
- Docket: 2000-NM-291-AD
- FR document: 00-27792
- Official PDF: https://openairdocs.org/files/sha256/eb/6a/eb6ad1c1233c7b515948b46c9a694475719a91c31eb8d2a6c07db49cdc4613e4 (from https://www.govinfo.gov/content/pkg/FR-2000-10-30/pdf/00-27792.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/10/30/00-27792/airworthiness-directives-dassault-model-mystere-falcon-900-and-falcon-900ex-series-airplanes
- Page: https://openairdocs.org/proposed/2000-NM-291-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Dassault Model Mystere- Falcon 900 and Falcon 900EX series airplanes. This proposal would require replacement of the protective screens of the underfloor structure boxes at frame 25. This action is necessary to prevent water from collecting and freezing in the structure boxes at frame 25, which could result in jamming of the flight controls and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Oct 30, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-27792, comments due Nov 29, 2000 (https://www.federalregister.gov/documents/2000/10/30/00-27792/airworthiness-directives-dassault-model-mystere-falcon-900-and-falcon-900ex-series-airplanes)

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