# Airworthiness Directives; Dassault Model Mystere-Falcon 50 Series Airplanes
> **Rule** · Final rule. · Published 2004-03-01 · Effective 2004-04-05 · 69 FR 9521
## Document
- **Document number:** 04-4254
- **Category:** airworthiness
- **Manufacturer:** Dassault Model Mystere-Falcon 50 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 9521
- **Publication date:** 2004-03-01
- **Effective date:** 2004-04-05
- **FAA docket:** Docket No. 2003-NM-30-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Dassault Model Mystere-Falcon 50 series airplanes, that requires applying PR (fuel tank sealant) and installing PR patches over the internal side panel recesses of the left-hand and right-hand feeder tanks at certain frames and stringers. This action is necessary to prevent possible fuel ignition in the event of a lightning strike and consequent uncontained rupture of the fuel tank(s). This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/03/01/04-4254/airworthiness-directives-dassault-model-mystere-falcon-50-series-airplanes)
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