EASA AD No.: 2009-0208R1

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2009-0208R1

Date: 02 June 2010

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 Airworthiness Direc tive applies, except in accordance with the require ments of that Airworthiness Directive 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

Revision: This AD revises EASA AD 2009-0208 dated 13 October 2009



### ATA 34 Navigation - Radio-altimeter Lock-up - Opera tional Procedure

Manufacturer(s): Dassault Aviation

Applicability: All Falcon 7X aeroplanes, all serial numbers.

Reason: Several occurrences of untimely radio-altim eter lock-up have been reported, where the failed radio-altimeter indicated a negati ve distance to the ground despite the aircraft was flying at medium or high a ltitude.
A locked radio-altimeter #1 leads to untimely inhib ition of warnings that could be displayed along with certain abnormal conditions while the avionic system switches into landing mode during altitude cruise.
Investigation in order to determine the root cause of radio-altimeter lock-up is in progress. In the meantime, Dassault Aviation has developed an operational procedure that in case of radio-altimeter #1 lock-u p allows the crew, by depowering radio-altimeter #1, to restore in flight the system warning performance.
Failure to comply with this interim flight procedur e may cause the crew to be unaware of possible system failures that could requ ire urgent crew's actions.
To address this unsafe condition, AD 2009-0208 was issued on 13 October 2009. It mandated application of a new abnormal Air plane Flight Manual (AFM) procedure when radio-altimeter #1 lock-up occ urs and prohibited dispatch of the aeroplane with any radio-altimeter inoperative.EASA AD No.: 2009-0208R1

EASA Form 110 Page 2/2 Since AD 2009-0208 was issued, Easy avionics load 1 0 has been developed with change M0566 or Service Bulletin (SB) Falcon 7 X n°100 that brings new features to display a "RA miscompare" flag on both Primary Display Units (PDU) and accepts a commanded system reversion to t he correct radioaltimeter output. EASA AD 2009-0208R1 is issued to allow not deactiva ting radio-altimeter #1 in case lock-up conditions occur in flight for aero planes on which M0566 or SB Falcon 7X n°100 has been embodied.

Effective Date: Revision 1 : 16 June 2010 Original issue : 27 October 2009
Required Action(s) and Compliance Time(s): Required as indicated after the effective date of t he original issue of this AD: (1) For aeroplanes on which M0566 or SB Falcon 7X n °100 has not been embodied, if radio-altimeter #1 lock-up conditions occur in flight, power off radio-altimeter #1, in accordance with the instruct ions of Falcon 7X AFM procedure 3-140-65 or 3-140-65A. (2) For aeroplanes on which M0566 or SB Falcon 7X n °100 has been embodied, if radio-altimeter #1 lock-up conditions occur in flight, revert to the correct radio-altimeter output, in accordance w ith the instructions of Falcon 7X AFM procedure 3-140-65B and 3-140-70A. (3) Dispatch of the aeroplane with any radio-altime ter inoperative is prohibited. (4) Strikethrough of item 34-10 “Radio-Altimeters ( RA)” in the Minimum Equipment List (MEL) and inserting a copy of this A D for the corresponding MEL entry of each aeroplane is consid ered acceptable to comply with the requirement of paragraph (3) of thi s AD.

Ref. Publications: • Falcon 7X AFM DGT105608 rev. 9 including Abnormal Procedure 3-140-65 or 3-140-65A or 3-140-65B "radar-altimeter #1 locked" and Abnormal Procedure 3-140-70A. “Sensor miscompare (A /C with M566)”.

• Falcon 7X MMEL DGT 106042 rev. 4.

• Service Bulletin Falcon 7X n°100 original issue. The use of later approved revisions of these docume nts 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. The required actions and the risk allowance have granted the issuance of a Final AD with Request for Comments, postponing th e public consultation process after publication. 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 ts 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