EASA AD No : 2011-0008

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2011-0008

Date: 18 January 2011

Note: This Airworthiness Directive (AD) is issued b y EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the Europe an Community, its Member States and of the European third countries that participate in the activities of EASA under Article 66 of that Regulation.
This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the continuing airworthiness of an aircraft shall be en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an AD applies, except in accordance with the requirements of that AD unle ss otherwise specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agre ed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption]. 

### Type Approval Holder’s Name :

DASSAULT AVIATION Type/Model designation(s) : FALCON 7X aeroplanes

TCDS Number : EASA.A.155

Foreign AD : Not Applicable

Supersedure : None



### ATA 24 Electrical Power – Ram Air Turbine Transformer Rect ifier Unit –

Replacement

Manufacturer(s): DASSAULT AVIATION

Applicability: All Falcon 7X aeroplanes, all serial numbers equipped with Ram Air Turbine Transformer Rectifier Unit P/N 5913703.

Reason: The manufacturer of the Transformer Rectifi er Unit (TRU) part of the Ram Air Turbine (RAT) system has identified an incorrect de sign of the part. The internal wiring that conducts the high voltage alternative current from the RAT generator may become loose due to insufficient crimping of the wire end contacts. This condition, if not corrected and if occurring w hile the RAT is deployed, could result in a degraded direct current power whi ch is distributed to essential aeroplane systems and therefore aeroplane operations might be impaired. To address this unsafe condition, the manufacturer of the RAT TRU has developed an improved RAT TRU with a new Part Numbe r (P/N). This AD requires replacement of the affected RAT TR U by a modified RAT TRU.

Effective Date: 01 February 2011

Required action(s) Required as indicated unless pre viously accomplished:EASA AD No : 2011-0008

EASA Form 110 Page 2/2 and Compliance Time(s): (1) Within 28 months after the effective date of th is AD, remove RAT TRU with P/N 5913703 and replace it with RAT TRU with P /N 5915825, in accordance with the accomplishment instructions of Dassault Aviation Falcon 7X Service Bulletin n° 163. (2) After the effective date of this AD, do not ins tall on any aeroplane RAT TRU with P/N 5913703.

Ref. Publications: Dassault Aviation Service Bulletin 7X-163, initial issue dated 01 December 2010. The use of later approved revisions of this documen t is acceptable for compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD. 2. This AD was posted on 14 December 2010 as PAD 10 -123 for consultation until 11 January 2011. No comments wer e received during the consultation period. 3. Enquiries regarding this AD should be referred t o the Airworthiness Directives, Safety Management & Research Section, C ertification Directorate, EASA. E-mail ADs@easa.europa.eu

. 4. For any question concerning the technical conten t of the requirements in this AD, please contact your Dassault Falcon Techni cal Assistance:

• For Europe, Middle East and Africa based operators : Hot Line: (33) 1 47 11 37 37 / Fax: (33) 1 47 11 8 9 49

• For USA, Canada and Mexico based operators: Help Desk: (1) 800-2FALCON (2325266) / Fax: (1) 20 1 541 4740

• All other areas: Help Desk: (1) 201 541 4747 / Fax: (1) 201 541 474 0