## EASA EASA AD No: 2010-0073 

## AIRWORTHINESS DIRECTIVE AD No.: 2010-0073

Date: 15

### April2010 Note: This Airworthiness Directive (AD) is issued by EASA, "cling Inaccordance wit~ Regulation (Ee) No 216/2008 011behalf 01the European Community, its Member States and of the ELIrope~n third COUr1lriesthat participate in the activities of EASA under Article 66 of that Regulation. 

### I This AD is issued in a(:cordance with EC 170212003, Part 21A.3B. In a~cOrdarFce with EC 204212003 Annex I, Part M,A,301, lhe wntinuing airworthiness of an aircr~ft shall be ensured by accomplishing any applicable ADs. COrlseqLJen~y, no person m~y operate an air<;raft to whiCh an AD applies, except in ~ccordance with lhe~requirements of that AD unless otherwise specified by the Agency (EG 204212003 Armex I. Part M,A.303] or ",greed with the Authority of the Slate of Registry lEG 21612008. ArtiCle 14(4) exemption]. 

### I Type Approval Holder's Name: DASSAULT AVIATION 

### T~pe/Modeldesignation(s) : F.f\LeON 7X
reDS Number: Foreign AD. Supersedure.



### ATA24
Manufacturer(s }: Applicability:
Reason:

EASA Form 112 EASAA155 Notapplicable None


### Electrical Power· TransiJnt Voltage Suppressor Diodes - InspectionfReplacement I I Dassault Aviation 

### I Falcon 7Xaeroplanes, allseriallnumbers except those onwhich modification Dassault Aviation M724 isembrDdied. I Several inservice events relat~d tovarious electrical systems, have ledtothe discovery of a common root leause: a leakage failure mode of Transient Voltage Suppressor (TVS) diodes used on Power Distribution Control Units (PDCU) cards or Generator Cbntrol Unit (GCU) cards in the Primary Power Distribution Boxes (PPDB). Du~tosuch TVS diode failure mode, operation of some electrical circuits is degraded and some control signals are set at unexpected levels. Further anaiysis indicated thatcombination ofaTVS diode failure with othersystems failur~s could significantly reduce flight safety. To prevent and correct this cbndition, some Airplane Flight Manual (AFM) procedures have been modified to reduce the time of exposure to further failures whenever aTVS diode failure occurs. Additionally, afield tester has been developed totest allTvsi diodes installed on the PDCU and GCU cards forthe detection ofcomponent~ beyond acceptable tolerances, The criteria for PDCU or GCU card replacembnt in case of detection of faulty components have been identified. 

### I This AD requires the accomplishment of the revised AFM procedures, the testing and, as necessary. the!replacement of the affected PDCU and GCU 

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1EASAADNo 2010-0073 cards_ Meanwhile, Dassault Aviation isdeveloping a modification (M724), to improve PDCU and GCU cards, with TVS diodes having reduced susceptibility to the leakage failure mode. Effective Date: 29April 2010 Required Aclion(s) Required as indicated, unless accomplished previously: and Compliance Time(s): (1)After the effective date ofthis AD, amend the F7X AFM sub-section abnormal procedures and the QUick Reference Handbook 2(QRH 2) subsections abnormal ELEC and HYD as indicaled below: 0 Upon display of ELEC:BUS MISCONFIG TIED in Crew Alerting System (Abrlormal procedure 3-190-20), land at

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. I nearest sUita el:llfPO~ 0 ~bO~~i~~:Zb~~~,~~~~~e;~~ ~_~~b_~~)~~a~~:~~;~e;tSS suitable airport 0 Upon display of ELEC:RH ESS PWR LO and ELEC:RH ESS NO PWR (Abnormal procedure 3-190-45), land at nearest suitable airport 0 Upon display of HYD:BACKUP PUMP 

### HI TEMP (Abnormal procedure 3-250-15), set off the pump and if the backup pump is still rotaling (green) in hydraulic synoptic, descend 10asafe altitude or below 15,000 ft Caution: These temporary amendments take precedence over the same procedures displayed through the Electronic Check List (ECL) inthe aeroplane. (2) Pending incorporation ofthese changes into the next revision ofthe AFM, compliance with paragraph (1) ofthis AD may bedemonstrated inserting acopy ofthis AD into theAFM, subsection Abnormal Procedures 3-190- 20,3-190-40,3-190-45 and 3-250-15, into the QRH2, subsections Abnormal ELEC and HYD'I (3) Forthe aeroplane serial nur:bers included inthe effectivity of Dassault AViation Falcon 7X Servicli Bulletin (S8) n°133, within 9 months after the effective date ofthis AIDinspect the PDCU and GCU cards in accordance with the instruftions ofthe SB. Incase of detection offaulty components, before further flight remove and replace the affected PDCU and GCU cards inaccorda'nce with the instructions of Dassault Aviation S8 n"'l33. (4) Accomplishment ofGoodrich Service Bulletins 80232190-24-01, 80232191-24-01 and 80232192-24-01 isalso acceptable tocomply with the requirements ofparagraph (3) ofthis AD.

- F7XAFM DGT105608 Rev 8.



## - Dassault Aviation Service Bulletin Falcon 7X n~1 33original issue. Ref. Publications: 

## - Goodrich Service Bulletin 80232190-24-01 original issue_

- Goodrich Service Bulletin S0232191-24-01 original issue,



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- Goodrich Service Bulletin Sq2321 92-24-01 original issue.
EASA Form 112 Page 2/3EASAAD No: 2010--0073 The use of later approved revisions ofthese documents isacceptable for compliance with the requirements ofthis AD. Remarks: 

# ,. Ifrequested and appropriately substantiated, EASA can approve 

### A1temall,e Melhods ofc0r."la"e focthisAD. 2. This ADwas posted on 11 March 2010 as PAD 10-022 for consultation until 08April 2010. No comments were received during the consultation period_ 

### 3. Enquiries regarding this AD should be referred to the Airworthiness Directives, Safely Management & Research Section, Certification Directorate, EASA. E-mail ADs@easa.europa.eu_ 4. Forany question concerning thetechnical content ofthe requirements in this AD, please contact your Dassault Falcon Technicai Assistance:


## • For Europe, Middle E~st and Africa based operators: Hot Line: (33) 147111 3737 {Fax: (33) 1 4711 8949


## • For USA, Canada and Mexico based operators: Help Desk: (1) BOO-2FALCON (2325266) (Fax: (1) 201 541 4740


## • All other areas: Help Desk: (1) 201 541 4747 (Fax: (1) 201 541 4740

EASA Form 112 

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