# Airworthiness Directives; Dassault Model Mystere-Falcon 50 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2003-05-20 · Effective 2003-06-04 · 68 FR 27450
## Document
- **Document number:** 03-12110
- **Category:** airworthiness
- **Manufacturer:** Dassault Model Mystere-Falcon 50 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 68 FR 27450
- **Publication date:** 2003-05-20
- **Effective date:** 2003-06-04
- **FAA docket:** Docket No. 2003-NM-118-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Dassault Model Mystere-Falcon 50 series airplanes. This action requires a detailed inspection for clearance and chafing of the entire length of the hydraulic lines located within the engine pylons, and follow-on/corrective actions, as applicable. This action also requires a revision of the maintenance manual to ensure that the clamps that hold the hydraulic lines are in their initial position during normal maintenance, and that the position is identified with a yellow paint line. This action is necessary to prevent chafing and consequent leakage of the hydraulic lines located within the No. 1 and No. 3 engine pylons, which can result in failure of the No. 1 and No. 2 hydraulic systems, 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/2003/05/20/03-12110/airworthiness-directives-dassault-model-mystere-falcon-50-series-airplanes)
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