# FALCON 7X

No 065 JULY 24, 2009 

# MANDATORY

ATA 32 

# LANDING GEAR WEIGHT-ON-WHEELS (WOW) FUSE ADDITION ON PROXIMITY SENSORS 

# FALCON SERVICE BULLETIN

Copyright © 2009 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.



### 7850900400080342772 - VALIDATED - Certification Repository

# LANDING GEAR

WEIGHT-ON-WHEELS (WOW) FUSE ADDITION ON PROXIMITY SENSORS

Initial issuance July 24, 2009 List of effective pages: 1 to 11 

# FALCON 7X 7X-065

ATA 32

## LANDING GEAR WEIGHT-ON-WHEELS (WOW) FUSE ADDITION ON PROXIMITY SENSORS

1. PLANNING INFORMATION A. EFFECTIVITY This Service Bulletin is applicable to FALCON 7X aircraft which have not implemented DASSAULT AVIATION modification FALCON 7X M1031. B. REASON In case a short circuit occurs on a Weight-On-Wheels (WOW) proximity sensor wiring, the associated power supply circuit breaker will trip. As one circuit breaker powers several WOW proximity sensors, those will be de-powered at the same time. The purpose of this Service Bulletin is to improve the WOW function robustness against any short circuit on landing gear proximity sensor wiring. To achieve this, fuses are added on each electrical power supply of the nine WOW sensors. This will prevent a multiple loss of WOW proximity sensors in case of a short circuit on one sensor wiring. C. DESCRIPTION The operation consists in installing nine plug-in fuses in the wiring near the electrical cabinets (FR8-9, cockpit): • five fuses are installed on top of the LH electrical cabinet, close to junction module (203 J3), • four fuses are installed on top of the RH electrical cabinet, close to junction module (202 J4). D. COMPLIANCE Mandatory: (1) It is anticipated that this Service Bulletin will be rendered mandatory by an EASA Airworthiness Directive. (2) As prescribed by the Airworthiness Authorities of the country of registration of the aircraft. E. APPROVAL This Service Bulletin covers DASSAULT AVIATION modification FALCON 7X M1031 which has been approved by EASA. The technical content of this document is approved under the authority of DOA nr. EASA.21J.051. F. LABOR Estimated labor-hours: 9 hours. NOTE: These labor-hours only concern the work described in this Service Bulletin and do not include other maintenance work which may be performed on this occasion. 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 1 / 11DASSAULT AVIATION Proprietary DataG. MATERIAL - PRICE AND AVAILABILITY

The modification kit may be obtained from either address listed below: Western hemisphere: DASSAULT FALCON JET CORP. SPARES DISTRIBUTION CENTER 200 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 Price and availability on request. H. TOOLING - PRICE AND AVAILABILITY Normal maintenance tooling. I. WEIGHT AND BALANCE Change in weight: Negligible. Change in balance with respect to 25% MAC: Negligible. J. REFERENCES Aircraft Maintenance Manual: • GENERAL MAINTENANCE AND SAFETY PRECAUTIONS (Refer to TASK 20-95-00-910-801 ) • USE OF THE AIRCRAFT MAINTENANCE PROCEDURES (Refer to TASK 24-00-00-860-803 )

• ELECTRICAL SYSTEM MAINTENANCE AND SAFETY PRECAUTIONS ( Refer to TASK 24-00-00-910-801 ) • USE OF THE TARGETS FOR FLIGHT SIMULATION (Refer to TASK 32-60-00-910-802 ) 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 2 / 11DASSAULT AVIATION Proprietary Data• USE OF CENTRAL MAINTENANCE COMPUTER (CMC) QUICK REFERENCE HANDBOOK (Refer to TASK 45-10-00-910-801 ) Wiring Diagram Manual: • Chap. 24-10-00 • Chap. 32-62-30 K. OTHER PUBLICATIONS AFFECTED The following publications will be revised at a later date to account for the changes introduced by this Service Bulletin: • Illustrated Parts Catalog. • Aircraft Maintenance Manual. • Wiring Diagram Manual. 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 3 / 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 cockpit lateral lining No.5 ( 221XZ ) to gain access to LH front SPDB ( L1000PM ). (3) On LH front SPDB ( L1000PM ), open the following circuit breakers: • "LH WOW" circuit breaker ( L210GW), • "RH WOW LH" circuit breaker ( L110GW). (4) Remove the cockpit lateral lining No.5 ( 222XZ ) to gain access to RH front SPDB ( R1000PM ). (5) On RH front SPDB ( R1000PM ), open the following circuit breakers: • "RH WOW" circuit breaker ( R210GW), • "LH WOW RH" circuit breaker ( R110GW). B. GENERAL ELECTRICAL INSTRUCTIONS (1) Obey the electrical safety precautions (Refer to TASK 24-00-00-910-801 ). (2) Check that all connections are properly protected to ensure proper insulation and that markings are visible and appropriate. (3) Visually inspect the work area for particles or debris, then vacuum-clean. The blowing of compressed air is prohibited since it could move metal chips to inaccessible areas. C. FUSE INSTALLATION (1) On top of LH front SPDB ( L1000PM ), close to junction (203 J3) (fig. 1 ): Install the five following fuses (Items 1,2,3,4 and 5) as follows: • WOW1 LH MLG fuse ( L2013GA) • WOW2 LH MLG fuse ( L3013GA) • WOW3 LH MLG fuse ( L4013GA) • WOW1 NLG fuse ( L2511GB ) • WOW2 NLG fuse ( R2511GB ) (a) Do the electrical wiring modifications in accordance with wiring diagram in fig. 3

.

CAUTION: PAY PARTICULAR ATTENTION TO THE WIRING INSTALLATION

REQUIREMENT SHOWN IN FIG. 1 , DETAIL A. (b) Install the five fuses along the straight section of main harness.

CAUTION: DO NOT USE SELF-TIGHTENING CLAMP OR WIRE TIES. (c) Attach the five fuses on main harness with binding. (d) Bond the appropriate fuse identification labels. (e) Do a wire-by-wire check of the new wiring installation: • Successively, check the continuity between terminal A (landing gear wiring) of : • LH MLG WOW proximity switch 1 ( L2003GA), • LH MLG WOW proximity switch 2 ( L3003GA), 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 4 / 11DASSAULT AVIATION Proprietary Data• LH MLG WOW proximity switch 3 ( L7003GA), • NLG WOW proximity switch 1 ( L2501GB ), • NLG WOW proximity switch 2 ( R2501GB ), and terminal S4 (feeder) of RH front SPDB ( R1000PM ) (WD 24-10-00). (2) On top of RH front SPDB ( R1000PM ), close to junction (204 J2) (fig. 2 ): Install the four following fuses (items 6,7,8 and 9) as follows: • WOW1 RH MLG fuse ( R2013GA ) • WOW2 RH MLG fuse ( R3013GA ) • WOW3 RH MLG fuse ( R4013GA ) • WOW3 NLG fuse ( 2011GB ) NOTE: In order to facilitate the fuse installation, the equipment in the work area can be moved aside but not disconnected. (a) Do the electrical wiring modifications in accordance with wiring diagram in fig. 3

.

CAUTION: PAY PARTICULAR ATTENTION TO THE WIRING INSTALLATION

REQUIREMENT SHOWN IN FIG. 2 , DETAIL A. (b) Install the four fuses along the straight section of main harness. CAUTION: DO NOT USE SELF-TIGHTENING CLAMP OR WIRE TIES. (c) Attach the four new fuses on main harness with binding. (d) Bond the appropriate fuse identification labels. (e) Do a wire-by-wire check of the new wiring installation: • Successively, check the continuity between terminal A (landing gear wiring) of : • RH MLG WOW proximity switch 1 ( R2003GA ), • RH MLG WOW proximity switch 2 ( R3003GA ), • RH MLG WOW proximity switch 3 ( R7003GA ), • NLG WOW proximity switch 3 ( 2001GB ), and terminal S2 (feeder) of LH front SPDB ( L1000PM ) (WD 24-10-00). D. TEST (1) Energize the aircraft from the electrical Ground Power Unit (GPU): (a) Connect the electrical GPU (Refer to TASK 24-00-00-860-803 ). (b) Energize the aircraft (Refer to TASK 24-00-00-860-803 ). (2) Close the following circuit breakers: • "LH WOW" circuit breaker ( L210GW), • "RH WOW LH" circuit breaker ( L110GW), • "RH WOW" circuit breaker ( R210GW), • "LH WOW RH" circuit breaker ( R110GW). (3) Use the flight simulation targets to simulate an “In Flight” configuration on each proximity switch (Refer to TASK 32-60-00-910-802 ). (4) Get access to the " GROUND/FLIGHT SENSORS STATUS " maintenance screen ( Refer to TASK 45-10-00-910-801 ). 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 5 / 11DASSAULT AVIATION Proprietary Data(5) Make sure that the parameters that follow are: • " LH MLG WOW1 STATUS " IN FLIGHT, • " LH MLG WOW2 STATUS " IN FLIGHT, • " LH MLG WOW3 CHA STATUS " IN FLIGHT, • " LH MLG WOW3 CHB STATUS " IN FLIGHT, • " RH MLG WOW1 STATUS " IN FLIGHT, • " RH MLG WOW2 STATUS " IN FLIGHT, • " RH MLG WOW3 CHA STATUS " IN FLIGHT, • " RH MLG WOW3 CHB STATUS " IN FLIGHT, • " NLG WOW1 STATUS " IN FLIGHT, • " NLG WOW2 STATUS "IN FLIGHT, • " NLG WOW3 CHA STATUS " IN FLIGHT, • " NLG WOW3 CHB STATUS " IN FLIGHT. (6) Remove the flight simulation targets from each proximity switch (Refer to TASK 32-60-00-910-802 ). (7) Make sure that the parameter corresponding to the simulated proximity switch shows “ON GROUND” status. (8) De-energize the aircraft (Refer to TASK 24-00-00-860-803 ). (9) Disconnect the electrical GPU (Refer to TASK 24-00-00-860-803 ). E. FINAL STEPS (1) Install the cockpit lateral lining No.5 ( 221XZ ). (2) Install the cockpit lateral lining No.5 ( 222XZ ). F. RECORDING Record compliance with this Service Bulletin in the appropriate aircraft documents. Fill out the electronic Service Bulletin reply form located in the ”Service Bulletin" page on the Falcon portal. Incorporate the diagram of figure 3 into the aircraft Wiring Diagram Manual, chap. 32-62-30. 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 6 / 11DASSAULT AVIATION Proprietary Data3. MATERIAL INFORMATION

A. MODIFICATION KIT - ELECTRICAL CIRCUIT KIT P/N SBF7X0065A

NEW P/N Q

T Y KEY WORD INSTRUCTIONS DISPOSITION I T E M F

I G

BJE 267 9 Fuse 1, 2, 3, 4, 5, 6, 7, 8, 9 1, 2

01EQT53105A20P01 18 Contact Fuse contacts 01EQT53105A22P01 9 Contact Module contacts 01CAN211-1-22 9 m Cable L2013GA 1

Sheath 01PRORNF1-2GR Fuse markings L3013GA 1 L4013GA 1 L2511GB 1 R2511GB 1 R2013GA 1 R3013GA 1 R4013GA 1 2011GB 1 L2013GA 1

E19 label with black marking Fuse identification on aircraft structure L3013GA 1 L4013GA 1 L2511GB 1 R2511GB 1 R2013GA 1 R3013GA 1 R4013GA 1 2011GB 1 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 7 / 11DASSAULT AVIATION Proprietary DataNEW P/N Q T Y KEY WORD INSTRUCTIONS DISPOSITION I T E M F

I G
L2013GA/203J3-N12 2

Sleeve 01PROTMS3-32GR Wire markings 3 L3013GA/203J3-N12 2 3 L4013GA/203J3-N12 2 3 L2511GB/203J3-N12 2 3 R2511GB/203J3-N12 2 3 R2013GA/202J4-A12 2 3 R3013GA/202J4-A12 2 3 R4013GA/202J4-A12 2 3 2011GB/202J4-A12 2 3
B. LOCAL PROCUREMENT Binding (01FFFTF4BK, black) 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 8 / 11DASSAULT AVIATION Proprietary DataFigure 1 : Fuse Installation - LH Cabinet 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 9 / 11DASSAULT AVIATION Proprietary DataFigure 2 : Fuse Installation - RH Cabinet 

# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 10 / 11DASSAULT AVIATION Proprietary DataFigure 3 : Fuse Installation - Wiring Modification



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# FALCON 7X 7X-065

July 24, 2009 ATA 32 Initial issuance Page 11 / 11DASSAULT AVIATION Proprietary Data