# Airworthiness Directives; Dassault Model Mystere-Falcon 50 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1997-11-13 · Effective 1997-11-18 · 62 FR 60773
## Document
- **Document number:** 97-29789
- **Category:** airworthiness
- **Manufacturer:** Dassault Model Mystere-Falcon 50 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 62 FR 60773
- **Publication date:** 1997-11-13
- **Effective date:** 1997-11-18
- **FAA docket:** Docket No. 97-NM-275-AD
## Abstract

This document publishes in the Federal Register an amendment adopting airworthiness directive (AD) 97-21-16 that was sent previously to all known U.S. owners and operators of Dassault Model Mystere-Falcon series airplanes by individual notices. This AD 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 action is prompted by a report indicating that erroneous minimum anti-icing N1 thrust setting indications were displayed on the Engine Indication Electronic Display (EIED). The actions specified by this AD are intended to prevent flightcrew use of erroneous N1 thrust setting information displayed on the EIED, which could result in in-flight shutdown of engine(s).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/11/13/97-29789/airworthiness-directives-dassault-model-mystere-falcon-50-series-airplanes)
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