# Airworthiness Directives; Dassault Aviation Airplanes
> **Rule** · Final rule; request for comments. · Published 2021-02-05 · Effective 2021-02-22 · 86 FR 8302
## Document
- **Document number:** 2021-02478
- **Category:** airworthiness
- **Manufacturer:** Dassault Aviation
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 86 FR 8302
- **Publication date:** 2021-02-05
- **Effective date:** 2021-02-22
- **FAA docket:** Docket No. FAA-2021-0024
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Dassault Aviation Model FALCON 7X airplanes. This AD was prompted by a report of deviations concerning the assembly and overhaul of certain crew oxygen mask stowage boxes, including incorrect application of a certain thread-locker on the fitting sensor screws. This AD requires an inspection of certain crew oxygen mask stowage boxes for discrepancies, and replacement if necessary, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/02/05/2021-02478/airworthiness-directives-dassault-aviation-airplanes)
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