# Proposed AD FAA-2012-0265: Dassault Aviation Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-12-18
- Products: Dassault
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 15, 2012, 77 FR 15293
- Comments due: April 30, 2012
- Became: [AD 2012-12-18](https://openairdocs.org/ad/2012-12-18)
- Docket: FAA-2012-0265 (https://www.regulations.gov/docket/FAA-2012-0265, where comments are filed)
- Project: 2010-NM-216-AD
- FR document: 2012-6249
- Official PDF: https://openairdocs.org/files/sha256/25/dd/25dd74533979ff5e52fb2ae5bd2bd9e8619bcec0689bede3aed6dfe69c528844 (from https://www.govinfo.gov/content/pkg/FR-2012-03-15/pdf/2012-6249.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/03/15/2012-6249/airworthiness-directives-dassault-aviation-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CB8611159C29DA18862579C2004821A1.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0265

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to certain Dassault Aviation Model FALCON 7X airplanes. The existing AD currently requires revising the Abnormal Procedures and Limitations sections of the Dassault F7X airplane flight manual. Since we issued that AD, we have determined that additional actions are necessary to address the identified unsafe condition. This proposed AD would require performing a test of the power distribution control units (PDCU) cards and generator control units (GCU) cards to detect faculty components, and if any faulty components are found, replacing any affected PDCU or GCU card. We are proposing this AD to detect and correct a leakage failure mode of transient voltage suppression (TVS) diodes used on PDCU cards or GCU cards in the primary power distribution boxes (PPDB), which, in combination with other system failures, could lead to loss of controllability of the airplane.

## Notices in this docket

- Mar 15, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-6249, comments due Apr 30, 2012 (https://www.federalregister.gov/documents/2012/03/15/2012-6249/airworthiness-directives-dassault-aviation-airplanes)

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