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 by EASA, acting in accordance with 

Regulation (EC) No 216/2008 on behalf of the European 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 ensured by accomplishing any applicable ADs. Consequently, no person may 

operate an aircraft to which an AD applies, except in accordance with the requirements of that AD unless otherwise specified by the 

Agency [EC 2042/2003 Annex I, Part M.A.303] or agreed 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 Rectifier 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 Rectifier Unit (TRU) part of the Ram Air 

Turbine (RAT) system has identified an incorrect design 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 while the RAT is deployed, 

could result in a degraded direct current power which 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 Number (P/N). 

This AD requires replacement of the affected RAT TRU by a modified RAT 

TRU. 

Effective Date: 01 February 2011 

Required action(s) Required as indicated unless previously 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 this 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 install 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 document is acceptable for 

compliance with the requirements of this AD. 

Remarks : 1. If requested and appropriately substantiated, EASA 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 were received during 

the consultation period. 

3. Enquiries regarding this AD should be referred to the Airworthiness 

Directives, Safety Management & Research Section, Certification 

Directorate, EASA. E-mail ADs@easa.europa.eu. 

4. For any question concerning the technical content of the requirements in 

this AD, please contact your Dassault Falcon Technical Assistance: 

• For Europe, Middle East and Africa based operators: 

 Hot Line: (33) 1 47 11 37 37 / Fax: (33) 1 47 11 89 49 

• For USA, Canada and Mexico based operators: 

 Help Desk: (1) 800-2FALCON (2325266) / Fax: (1) 201 541 4740 

• All other areas: 

 Help Desk: (1) 201 541 4747 / Fax: (1) 201 541 4740