# Proposed AD FAA-2011-0042: DASSAULT AVIATION Model MYSTERE-FALCON 50 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-10-14
- Products: Dassault
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 16, 2011, 76 FR 8919
- Comments due: April 4, 2011
- Became: [AD 2011-10-14](https://openairdocs.org/ad/2011-10-14)
- Docket: FAA-2011-0042 (https://www.regulations.gov/docket/FAA-2011-0042, where comments are filed)
- Project: 2010-NM-267-AD
- FR document: 2011-3532
- Official PDF: https://openairdocs.org/files/sha256/a8/b0/a8b0794a8529ec5f8206aca9313fea1dfaf435435e4595a4b5bb060ea3f04992 (from https://www.govinfo.gov/content/pkg/FR-2011-02-16/pdf/2011-3532.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/02/16/2011-3532/airworthiness-directives-dassault-aviation-model-mystere-falcon-50-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5CF8135C3488B2D486257839004950C4.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0042

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

On two occurrences on Myst[egrave]re-Falcon 50 aeroplanes in service, it was detected that two pipes of the emergency brake system 2 located near the nose landing gear bearing were swapped.

The swapping of these two pipes implies that when the Left Hand (LH) brake pedal is depressed, the Right Hand (RH) brake unit is activated, and conversely, when the RH brake pedal is depressed, the LH brake unit is actuated. This constitutes an unsafe condition, which may go unnoticed as the condition is latent until the emergency brake system 2 is used. This condition, if not corrected, could ultimately lead to arunway excursion of the aeroplane.

* * * * *

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Feb 16, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-3532, comments due Apr 4, 2011 (https://www.federalregister.gov/documents/2011/02/16/2011-3532/airworthiness-directives-dassault-aviation-model-mystere-falcon-50-airplanes)

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