# Airworthiness Directives; Dassault Aviation Airplanes
> **Rule** · Final rule. · Published 2012-01-03 · Effective 2012-02-07 · 77 FR 3
## Document
- **Document number:** 2011-33569
- **Category:** airworthiness
- **Manufacturer:** Dassault Aviation
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 3
- **Publication date:** 2012-01-03
- **Effective date:** 2012-02-07
- **FAA docket:** Docket No. FAA-2011-1061
## Abstract

We are adopting a new airworthiness directive (AD) for certain Dassault Aviation Model FALCON 7X airplanes equipped with certain ram air turbine (RAT) transformer rectifier units (TRUs). This AD was prompted by a report of incorrect design of the TRU part of the RAT system. This AD requires replacing any affected RAT TRU with a modified RAT TRU. We are issuing this AD to prevent loose internal wiring in the RAT generator, which could result in degraded direct current power to essential airplane systems while the RAT is deployed, which could adversely affect continued safe flight and landing of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/01/03/2011-33569/airworthiness-directives-dassault-aviation-airplanes)
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