# Airworthiness Directives; Dassault Model Mystere-Falcon 900 and Falcon 900EX Series Airplanes
> **Rule** · Final rule. · Published 2001-06-19 · Effective 2001-07-24 · 66 FR 32896
## Document
- **Document number:** 01-14724
- **Category:** airworthiness
- **Manufacturer:** Dassault Model Mystere-Falcon 900 and Falcon 900EX Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 32896
- **Publication date:** 2001-06-19
- **Effective date:** 2001-07-24
- **FAA docket:** Docket No. 2000-NM-291-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Dassault Model Mystere-Falcon 900 and Falcon 900EX series airplanes, that requires replacement of the protective screens of the underfloor structure boxes at frame 25. This amendment 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/06/19/01-14724/airworthiness-directives-dassault-model-mystere-falcon-900-and-falcon-900ex-series-airplanes)
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