# Airworthiness Directives; Dassault Model Mystere-Falcon 50 Series Airplanes
> **Rule** · Final rule. · Published 2000-02-29 · Effective 2000-04-04 · 65 FR 10691
## Document
- **Document number:** 00-4566
- **Category:** airworthiness
- **Manufacturer:** Dassault Model Mystere-Falcon 50 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 10691
- **Publication date:** 2000-02-29
- **Effective date:** 2000-04-04
- **FAA docket:** Docket No. 98-NM-262-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Dassault Model Mystere-Falcon 50 series airplanes, that currently requires a revision to the Limitations section of the FAA-approved Airplane Flight Manual (AFM) to include procedures to use certain values to correctly gauge the minimum allowable N1 speed of the operative engines during operation in icing conditions. This amendment adds a new requirement for operators to adjust the thrust reverser handle stop, install new wiring, and modify the Digital Electronic Engine Control (DEEC) software, which terminates the AFM revision. 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 flightcrew use of erroneous N1 thrust setting information displayed on the Engine Indication Electronic Display (EIED), which could result in in-flight shutdown of engine(s).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/02/29/00-4566/airworthiness-directives-dassault-model-mystere-falcon-50-series-airplanes)
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