# FALCON 900

No 378-R1
JANUARY 26, 2015 

# MANDATORY

ATA 33-12
LIGHTING

EXTERNAL LIGHTSIMPROVED ELECTRICAL BONDING OF WHELEN ANTICOLLISION LIGHT TO THE S-DUCT COWL 

# FALCON SERVICE BULLETIN

Copyright © 2015 by Dassault Aviation All rights reserved. No part of this work may be reproduced or copied in any form or by any means without written permission

of Dassault Aviation.



### 447

### LIGHTING EXTERNAL LIGHTSIMPROVED ELECTRICAL BONDING OF WHELEN ANTI-COLLISION LIGHT TO THE SDUCT COWL

Initial issuance September 19, 2007 List of effective pages : 1 to 11

Revision 1 January 26, 2015 List of effective pages : 1 to 11 List of modified pages : 1 to 11 REASON: The Service Bulletin is now rendered mandatory.

This revision is not applicable to aircraft already modified per the initial issuance of this Service Bulletin. 

# FALCON 900 F900 -378

F900 -33-12

### LIGHTING EXTERNAL LIGHTSIMPROVED ELECTRICAL BONDING OF WHELEN ANTI-COLLISION LIGHT TO THE SDUCT COWL

1. PLANNING INFORMATION
A. EFFECTIVITY This Service Bulletin is applicable to FALCON 900 aircraft with serial numbers 1 through 202 equipped with a WHELEN anti-collision light on S-duct front upper fairing ( 353AT ) (A/C with fin tip SATCOM fairing). B. REASON The electrical bonding of the WHELEN anti–collision light installed on Engine No. 2 S-duct is currently provided at the junction connector. The bonding value may not be sufficient in case of lightning strike. The purpose of this Service Bulletin is to improve the anti-collision light bonding in order to make the light installation more resistant to damage in case of a lightning strike. C. DESCRIPTION The operation consists in:

• removing S-duct front upper fairing ( 353AT ), • installing a bonding strip between the anti-collision light and a fuselage pick-up rib. D. COMPLIANCE Mandatory: • This Service Bulletin is rendered mandatory by EASA Airworthiness Directive No. 2015-0006. • As prescribed by the Airworthiness Authorities of the country of registration of the aircraft. E. APPROVAL This Service Bulletin covers DASSAULT AVIATION modification F900 M5386 that has been approved under the authority of DOA nr. EASA.21J.051. The technical content of this document is approved under the authority of DOA nr. EASA.21J.051. F. LABOR Estimated labor-hours: Refer to Service Bulletin Commercial Summary. NOTE: These labor-hours only concern the work described in this Service Bulletin and do not include other maintenance work that may be performed on this occasion.
G. MATERIAL - PRICE AND AVAILABILITY The modification kit may be obtained from either address listed below: Western hemisphere: DASSAULT FALCON JET CORP. SPARES DISTRIBUTION CENTER 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 1 / 11DASSAULT AVIATION Proprietary Data200 RISER ROAD LITTLE FERRY, NJ 07643 U.S.A. Telephone: • CANADA and U.S.A.: 1-800-800-4036 • MEXICO: 001-800-800-4036 • Other countries: 1-201-541-4809 Fax: • CANADA and U.S.A.: 1-800-800-4817 • MEXICO: 001-800-800-4817 • Other countries: 1-201-440-7021 Other continents: DASSAULT AVIATION Falcon Spares BOITE POSTALE N°101 AEROPORT DU BOURGET 93350 - LE BOURGET Cedex (FRANCE) Please contact your Dassault Aviation Account Representative Telephone: 33 (0)1.48.35.56.78 Fax: 33 (0)1.48.35.56.00 E/H dafsorder@dassault-aviation.com Price and availability on request. H. TOOLING - PRICE AND AVAILABILITY Normal maintenance tooling. I. WEIGHT AND BALANCE Change in weight: None. Change in balance with respect to 25% MAC: None. J. REFERENCES Aircraft Maintenance Manual: • GENERAL MAINTENANCE AND SAFETY PRECAUTIONS (Refer to TASK 20-00-00-910-801 )

• PRINCIPLES AND CHECK OF THE ELECTRICAL BONDING ( Refer to TASK 20-20-00-910-801 )

• REPLACEMENT OF THE WHITE REAR NAVIGATION / ANTI-COLLISION LIGHT FLASH TUBE (Refer to TASK 33-40-07-960-801 ) Structural Repair Manual: • INSTALLATION OF SHUR-LOK BLIND TYPE INSERT (Refer to SRM 51-40-05 ) K. OTHER PUBLICATIONS AFFECTED The following publication is revised to account for the changes introduced by this Service Bulletin: • Illustrated Parts Catalog. 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 2 / 11DASSAULT AVIATION Proprietary Data2. ACCOMPLISHMENT INSTRUCTIONS

A. PRELIMINARY STEPS (1) The aircraft must be in the maintenance configuration (Refer to TASK 20-00-00-910-801 ). (2) Remove the screws securing S-duct front upper fairing ( 353AT ). (3) Disengage S-duct front upper fairing ( 353AT ) from the rib. (4) Disconnect upper anti-collision light ( 4LX ). (5) Remove S-duct front upper fairing ( 353AT ). (6) Protect the connectors with caps/lugs. B. ELECTRICAL BONDING OF THE ANTI–COLLISION LIGHT (1) As per Maintenance Manual (Refer to TASK 33-40-07-960-801 ) :

• Remove the sealant embedding retainer (item 2) without removing the flexible seal located under it.

• Remove the retainer, glass cover and seal (items 2, 3 and 4). • Remove the anti-collision light housing. NOTE: Discard the seal if installed between the housing and the cowl. (2) As per fig. 1 , fig. 2 and fig. 3 : (a) From S-duct front upper fairing ( 353AT ) LH side, remove the two fittings attaching the anti– collision light pick-up plate blending with strip (1-fig. 3). (b) Install baseplate strip (item 1) on S-duct front upper fairing ( 353AT ) : drill a hole centered on the hole drilled for the attachment of S-duct front upper fairing ( 353AT ) , and joggle to abutment against the lower reinforcement. (c) Keep the strip applied against S-duct front upper fairing ( 353AT ). (d) Counterbore S-duct front upper fairing ( 353AT ) to dia. 0.1 in (2.5 mm) in accordance with the strip and pin-rig. (e) Joggle strip (item 1) at the anti-collision light pick–up plate. (f) Draw the outline of strip (item 1) on the pick-up plate. (g) Remove strip (item 1). (h) Remove the pick-up plate and the bead sealant

. (i) In the plate, drill a new hole to dia. 0.1 in (2.5 mm) for the additional attachment fitting (item 6). (j) Position the plate on S-duct front upper fairing ( 353AT ) and mark the location of the new hole. (k) Place insert (item 6) (Refer to SRM 51-40-05 ). (l) Drill the new hole to dia. 0.2 in (5 mm) in the pick-up plate. (m) Position strip (item 1) on the pick-up plate in accordance with the previously drawn outline. Drill the strip in accordance with the three holes drilled in the pick-up plate. 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 3 / 11DASSAULT AVIATION Proprietary Data(n) Secure the pick-up plate, except at the three strip pick-up locations, with interlaying sealant . Place bead sealant at the mating area with S-duct front upper fairing ( 353AT ). (3) As per fig. 3 , fig. 4 and fig. 5 : (a) Pin strip (item 1) to the pick-up plate (screws or pins). (b) Pin strip (item 1) to S-duct front upper fairing ( 353AT ). (c) One at a time, drill the pick-up holes of the strip and S-duct front upper fairing ( 353AT ) to dia. 0.2 in (5 mm), at the location of screws (item 2), and pin-rig as the operation proceeds to provide a satisfactory resting base. (d) Remove the strip. (e) Drill the lower hole of the strip to dia. 0.2 in (5 mm). (f) Remove the honeycomb from each hole drilled in S-duct front upper fairing ( 353AT ) over a dia. of 0.71 in (18 mm). (g) Completely fill the holes in S-duct front upper fairing ( 353AT ) with epoxy resin . Allow to cure. (h) Re-drill and countersink for screws (2-fig. 4). (4) As per fig. 3 : (a) Strip the paint from the upper surface of the anti-collision pick-up plate at the level of the housing installation plane. (b) Strip the paint from the lower surface of the anti–collision pick-up plate at the level of the mating plane of strip (item 1). (c) Protect the stripped parts with alodine

. (5) Clean the resting faces of the housing, the strip and S-duct front upper fairing ( 353AT ) with MEK

. (6) Apply interlaying sealant on the face of strip (item 1) resting on S-duct front upper fairing ( 353AT ). NOTE: Do not cover the part resting on the pick-up plate. (7) As per ( fig. 2 ) and ( fig. 4 ), secure the strip to S-duct front upper fairing ( 353AT ) with screws and nuts (items 2 and 3). Smooth the excess sealant at the periphery of the strip and cover the nuts with covering sealant

. (8) Attachment of strip (item 1) to the pick-up plate ( fig. 3 ): (a) Remove any sealant seeping in between the two elements. (b) Secure the assembly on S-duct front upper fairing ( 353AT ) with removed screws and washers (items 6 and 7). (c) Apply bead sealant to the periphery of the strip. (9) Modification of the fuselage rib ( fig. 2 ): (a) Mark the location of the hole picking up the strip on the rib. (b) Remove the sealant and the paint from the marked area. (c) Protect the stripped area with alodine

. 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 4 / 11DASSAULT AVIATION Proprietary DataC. FINAL STEPS (1) Secure the anti-collision light housing to S-duct front upper fairing ( 353AT ). (2) Install the seal, the glass cover and the retainer. (3) Apply bead sealant around the attachment plate. (4) Using indelible ink, inscribe “SB 378” on "Service Bulletin Compliance" label (8-fig. 1). (5) Using interlaying sealant , bond the "Service Bulletin Compliance" label to the internal skin of Sduct front upper fairing ( 353AT ) in the vicinity of the reference ( fig. 1 ). (6) Position S-duct front upper fairing ( 353AT ) on the fuselage. (7) Connect and safety upper anti-collision light ( 4LX ) to the housing. (8) Install S-duct front upper fairing ( 353AT ). (9) Measure bonding value between the anti–collision light baseplate and the reference test point in the mechanic’s servicing compartment (Refer to TASK 20-20-00-910-801 ). The value should be equal to or less than 2.5 mΩ max. (10) Check the anti-collision light for operation (Refer to TASK 33-40-07-960-801 ). D. RECORDING Record compliance with this Service Bulletin in the appropriate aircraft documents. Fill out the card located at the end of the Service Bulletin and mail or fax it to Dassault Aviation or Dassault Falcon Jet, or fill out the electronic Service Bulletin reply form located in the ”Service Bulletin" page on the Falcon portal. 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 5 / 11DASSAULT AVIATION Proprietary Data3. MATERIAL INFORMATION

A. MODIFICATION KIT KIT P/N SBF900EX0305A

NEW P/N QTY KEY WORD ITEM FIG FGFB823675330A1 1 Bonding strip Refer to (1-fig. 1) NAS1153V4A 5 Screw Refer to (2-fig. 4) HW17-3DF 5 Nut Refer to (3-fig. 4) NAS1921M05S03WU 3 Rivet Refer to (4-fig. 3) SL644M5-3 1 Insert Refer to (5-fig. 3) 22208TX050006XA 1 Screw Refer to (6-fig. 3) 23111DG050A 1 Washer Refer to (7-fig. 3) 79160 1 "Service Bulletin Compliance" label Refer to (8-fig. 1)
B. LOCAL PROCUREMENT As indicated in Consumable Products Manual (CPM):

• alodine

• bead sealant

• covering sealant

• interlaying sealant

• MEK or equivalent

• epoxy resin 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 6 / 11DASSAULT AVIATION Proprietary DataFigure 1: GENERAL VIEW 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 7 / 11Figure 2: VIEW A 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 8 / 11Figure 3: VIEW B 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 9 / 11Figure 4: CROSS-SECTION CC 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 10 / 11Figure 5: CROSS-SECTION DD



### END OF DOCUMENT 

# FALCON 900 F900 -378

January 26, 2015 F900 -33-12
Revision 1 Page 11 / 11SERVICE BULLETINS COMPLIANCE FALCON 900 A/C S/N

DASSAULT AVIATION Number ATA Number F900 378 F900 33 12 Coding: C complete compliance T partial compliance

Performed by: Remarks: Revision 1 Date: Signature:



### SERVICE BULLETINS COMPLIANCE
Would you be kind enough to inform us that this Service Bulletin is complied with: - For "Western Hemisphere", mail upper card (No postage necessary if mailed in the U.S.A.) or fax to Dassault Falcon Jet: 1-201-541-4700. - For "Other Continents", mail card herebelow or fax to Dassault Aviation: 33 (0)1.47.11.65.21. On the occasion, if other Service Bulletins have been simultaneously complied with could you complete the blank spaces provided for this purpose.



### APPLICATION DE BULLETINS DE SERVICE
Lorsque vous aurez applique ce Bulletin de Service sur votre avion, veuillez avoir l'amabilite de nous en informer: - Utiliser la carte reponse superieure pour continent americain (Dispensee de timbrage pour postage depuis les U.S.A.) ou le fax pour Dassault Falcon Jet : 1-201-541-4700. - Ou la carte reponse inferieure pour autres continents ou le fax pour Dassault Aviation : 33 (0)1.47.11.65.21. Eventuellement, si d'autres Bulletins de Service ont ete appliques simultanement, vous pouvez les mentionner dans les cases vierges prevues a cet effet.

APPLICATION DES BULLETINS DE SERVICE SERVICE BULLETINS COMPLIANCE FALCON 900 A/C S/N

DASSAULT AVIATION Number Numero DASSAULT AVIATION ATA Number Numero ATA F900 378 F900 33 12 Coding: C complete compliance application totale T partial compliance application partielle

Performed by: Fait par: Remarks: Revision 1 Date: Signature: Remarques: Revision 1