EASA AD No : 2011-0049 

EASA Form 110 Page 1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2011-0049 

Date: 21 March 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) : 

MYSTERE-FALCON 900 aeroplanes

TCDS Number: EASA. A.062 

Foreign AD: Not applicable 

Supersedure: None 

ATA 28 Fuel – Fuel Quantity Sensor – Identification / Replacement

Manufacturer(s): Dassault Aviation (formerly Avions Marcel Dassault-Bréguet Aviation) 

Applicability: Mystère-Falcon 900 aeroplanes, all serial numbers. 

Reason: Several Mystere-Falcon 900 aeroplanes experienced fuel leakage from a 

defective fuel high-level sensor located in the wing front spar. 

Investigations revealed that the leakage was due to a defective fuel quantity 

sensor Part Number (P/N) 722105-2. 

This condition, if not detected and corrected, could lead to an internal fuel 

leakage with significant fuel vapours, which could result in a fire hazard. 

To address this unsafe condition, Dassault Aviation have developed an 

improved fuel quantity sensor with a new concept of sealing. 

For the reasons described above, this AD requires the identification of the 

affected sensors and replacement with the improved part. 

Effective Date: 04 April 2011 

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

(1) Within 440 flight hours or 9 months, whichever occurs first after the 

effective date of this AD, accomplish the following actions: 

(1.1) Identify the P/N of the fuel quantity sensors to determine whether any 
EASA AD No : 2011-0049 

EASA Form 110 Page 2/2 

are P/N 722105-2. 

(1.2) If affected sensors are installed, replace the sensors P/N 722105-2 

with the improved sensors P/N 722105-3 in accordance with the 

accomplishment instructions of Dassault Aviation Service Bulletin F900-

410. 

(2) After modification of an aeroplane, as specified in paragraph (1.2) of this 

AD, do not install any sensor P/N 722105-2 on that aeroplane. 

(3) For an aeroplane that, on the effective date of this AD, already has sensors 

P/N 722105-3 installed, from the effective date of this AD, do not install 

any sensor P/N 722105-2 on that aeroplane. 

Ref. Publications: 

Dassault Aviation Service Bulletin F900-410, original issue. 

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 03 February 2011 as PAD 11-013 for 

consultation until 03 March 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