# FALCON 7X

No 241 MARCH 07, 2013 

# MANDATORY

ATA 35 OXYGEN

CREW OXYGEN SYSTEM REPLACEMENT OF CREW OXYGEN MASK STOWAGE BOX 

# FALCON SERVICE BULLETIN

Copyright © 2013 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.



### 785

### OXYGEN CREW OXYGEN SYSTEM REPLACEMENT OF CREW OXYGEN MASK STOWAGE BOX

Initial issuance March 07, 2013 List of effective pages : 1 to 13 

# FALCON 7X 7X -241

ATA 35

### OXYGEN CREW OXYGEN SYSTEM REPLACEMENT OF CREW OXYGEN MASK STOWAGE BOX

1. PLANNING INFORMATION A. EFFECTIVITY This Service Bulletin is applicable to FALCON 7X aircraft with serial numbers 2 and subsequent equipped with crew oxygen mask stowage box assy P/N MSE30-005-3-8 (including stowage box P/N CSD30-005-3-8) with serial number lower than 1013 without suffix "A". B. REASON The manufacturer of the crew oxygen mask stowage box P/N MSE30-005-3-8 / CSD30-005-3-8 has identified a potentially defective batch of stowage boxes. The thread locking cement on the ball screw that adjusts the travel of the mechanism allowing flow to the masks may have been forgotten when assembling the unit. This manufacturing issue may cause oxygen distribution to be restricted or lost in flight when "100%" or "EMGY" are commanded. The purpose of this Service Bulletin is to replace the suspected stowage boxes with serviceable ones. C. DESCRIPTION The operation consists in replacing the suspected crew oxygen mask stowage boxes with verified ones. D. COMPLIANCE Mandatory:

• It is anticipated that this Service Bulletin will be rendered mandatory by an EASA Emergency Airworthiness Directive. • As prescribed by the Airworthiness Authorities of the country of registration of the aircraft. E. APPROVAL 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 which may be performed on this occasion. G. MATERIAL - PRICE AND AVAILABILITY The modification kit may be obtained from either address listed below: 

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March 07, 2013 ATA 35 Initial issuance Page 1 / 13DASSAULT AVIATION Proprietary DataWestern 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: 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 )

• ENERGIZATION / DE-ENERGIZATION OF THE AIRCRAFT WITH THE ELECTRICAL GROUND POWER UNIT (GPU) (Refer to TASK 24-00-00-860-803 ) • OPENING / CLOSING OF THE CIRCUIT BREAKERS (Refer to TASK 24-00-00-860-807 ) • REMOVAL / INSTALLATION OF THE PILOT SEATS (Refer to TASK 25-11-01-900-801 ) • REMOVAL / INSTALLATION OF THE COCKPIT LININGS (Refer to TASK 25-13-13-900-801 )

• OXYGEN SYSTEM MAINTENANCE AND SAFETY PRECAUTIONS ( Refer to TASK 35-00-00-910-801 ) • OPERATIONAL TEST OF THE CREW OXYGEN SYSTEM (Refer to TASK 35-10-00-710-801 ) 

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March 07, 2013 ATA 35 Initial issuance Page 2 / 13DASSAULT AVIATION Proprietary Data• USE OF THE CENTRAL MAINTENANCE COMPUTER (CMC) - QUICK REFERENCE HANDBOOK (Refer to TASK 45-10-00-910-801 ) K. OTHER PUBLICATIONS AFFECTED None. 

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March 07, 2013 ATA 35 Initial issuance Page 3 / 13DASSAULT 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) Connect the electrical Ground Power Unit (GPU) (Refer to TASK 24-00-00-860-803 ). (3) Obey the oxygen system maintenance and safety precautions (Refer to TASK 35-00-00-910-801 ). (4) If it is necessary to energize the aircraft for other tasks, open the circuit breakers that follow (Refer to TASK 24-00-00-860-807 ): (a) On LH front SPDB ( L1000PM ): • " LH OXYGEN MASK" circuit breaker ( L1012WH )if you remove the LH crew oxygen mask stowage box, • " MID OXYGEN MASK" circuit breaker ( M1012WH )if you remove the third crew member oxygen mask stowage box. (b) On RH front SPDB ( R1000PM ): • " RH OXYGEN MASK" circuit breaker ( R1012WH )if you remove the RH crew oxygen mask stowage box. (5) Open oxygen cylinder upper access door ( 241BZ ) (see fig. 1 ). (6) Make sure that oxygen control lever ( 9531WY) is set to "OFF" (see fig. 1 ). (7) If you remove LH crew oxygen mask stowage box, remove LH pilot seat ( L1001MP )(Refer to TASK 25-11-01-900-801 ). (8) If you remove RH crew oxygen mask stowage box, remove RH pilot seat ( R2001MP ) ( Refer to TASK 25-11-01-900-801 ). (9) Remove the applicable linings that follow (Refer to TASK 25-13-13-900-801 ): • ( 221UZ ) and ( 221VZ ) to gain access to the LH crew oxygen mask stowage box (see fig. 2 ), • ( 221HZ )to gain access to the third crew member oxygen mask stowage box (removal of the pilot cabinet is necessary), • ( 222UZ ) and ( 222VZ ) to gain access to the RH crew oxygen mask stowage box (see fig. 2 ). (10) If you remove the LH or RH crew oxygen mask stowage box (see fig. 3 ): (a) Remove LH pilot wrist rest ( L3001MP ) or RH pilot wrist rest ( R4001MP ) (see fig. 2 ), (b) Remove the screws (1-fig. 3) and washers (2-fig. 3) from the trim strip. (c) Remove the trim strip (3-fig. 3). (d) Remove the screws (4-fig. 3) and washers (5-fig. 3). (e) On RH side, loosen the "Dzus" fasteners of the printer if installed. (f) Remove the web (6-fig. 3). B. REMOVAL OF THE CREW OXYGEN MASK STOWAGE BOX (1) Disconnect the electrical connector (7-fig. 3). (2) Disconnect the oxygen coupling (8-fig. 3). 

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March 07, 2013 ATA 35 Initial issuance Page 4 / 13DASSAULT AVIATION Proprietary Data(3) Disconnect the bonding braid (9-fig. 3) : To do it, remove the screw (10-fig. 3)and the washer (11- fig. 3). (4) Loosen the four “Dzus” screws (12-fig. 3). (5) Remove the crew oxygen mask stowage box. C. REMOVAL OF THE CREW OXYGEN MASK FROM STOWAGE BOX (1) Hold the red tabs (4-fig. 4) tightly to remove the crew oxygen mask from its stowage box. (2) Disconnect the radio jack connector (5-fig. 4). (3) Disconnect the capillary line (6-fig. 4). NOTE: Do not remove the attaching parts of the capillary line. (4) Disconnect the oxygen hose coupling (7-fig. 4). (5) Remove the crew oxygen mask. D. PREPARATION BEFORE INTALLATION OF THE CREW OXYGEN STOWAGE BOX (1) Install the old bonding braid on the old stowage box and remove the new bonding braid from the new stowage box: (a) Remove the screw (13-fig. 3) and the washer (14-fig. 3). (b) Put the old bonding braid (9-fig. 3) in position on the old stowage box. (c) Install the screw (10-fig. 3) and the washer (11-fig. 3). (d) Tighten the screw (10-fig. 3). (e) Remove the screw (10-fig. 3) and the washer (11-fig. 3). (f) Put the new bonding braid (9-fig. 3) in position. (g) Install the screw (13-fig. 3) and the washer (14-fig. 3). (h) Tighten the screw (13-fig. 3). E. INSTALLATION OF THE NEW CREW OXYGEN MASK STOWAGE BOX (1) Install the new crew oxygen mask stowage box. (2) Tighten the four “Dzus” screws (12-fig. 3). (3) Install the bonding braid (9-fig. 3). (4) Install the washer (11-fig. 3) and the screw (10-fig. 3). (5) Tighten the screw (10-fig. 3). (6) Connect the oxygen coupling (8-fig. 3). (7) Torque the oxygen coupling ( 8-fig. 3) to a value between 14.6 and 20.3 N.m (10.77 and 14.97 lbf.ft). (8) Make sure that the wiring and the connectors are in good condition: • no unwanted material on the insulating sleeves, • no pin bent. (9) Connect the electrical connector (7-fig. 3). 

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March 07, 2013 ATA 35 Initial issuance Page 5 / 13DASSAULT AVIATION Proprietary DataF. CONNECTION OF THE OXYGEN MASK TO THE OXYGEN MASK STOWAGE BOX (1) Connect the oxygen hose coupling (7-fig. 4). (2) Connect the capillary line (6-fig. 4). (3) Set oxygen control lever ( 9531WY ) to "ON" (see fig. 1 ). CAUTION: DO NOT USE LEAK DETECTOR ON THE CAPILLARY LINE COUPLING. (4) Apply leak detector on the oxygen couplings (7-fig. 4) and (8-fig. 3). (5) Make sure that there are no leaks at the couplings. (6) Clean the coupling with a lint-free cloth to remove the leak detector

. (7) Connect the radio jack connector (5-fig. 4). (8) Set oxygen control lever ( 9531WY) to "OFF" (see fig. 1 ). G. TEST (1) If you opened the circuit breakers that follow (Refer to TASK 24-00-00-860-807 ), close them: (a) On LH front SPDB ( L1000PM ): • " LH OXYGEN MASK" circuit breaker ( L1012WH )if you remove the LH crew oxygen mask stowage box, • " MID OXYGEN MASK" circuit breaker ( M1012WH )if you remove the third crew member oxygen mask stowage box. (b) On RH front SPDB ( R1000PM ): • " RH OXYGEN MASK" circuit breaker ( R1012WH )if you remove the RH crew oxygen mask stowage box. (2) Make sure that oxygen mode selector ( R9870PM ) is set to “NORMAL”. (3) Energize the aircraft (Refer to TASK 24-00-00-860-803 ). (4) Set oxygen control lever ( 9531WY) to "ON" (see fig. 1 ). (5) Perform the test of the mask and the stowage box ( Refer to TASK 35-10-00-710-801 , paragraph "Operational test of the crew oxygen mask and stowage box"). (6) Set oxygen control lever ( 9531WY) to "OFF" (see fig. 1 ). H. STOWAGE CAUTION: ACCURATELY SET THE “PRESS-TO-TEST” BUTTON TO “100%” TO PREVENT THE

BREAKAGE OF THE TWO HARNESS STUDS (10-FIG. 4). (1) Make sure that: • the “PRESS-TO-TEST” button (3-fig. 4) is set to “100 %”, • the LH and RH doors (8-fig. 4) are open,

• the oxygen connectors ( 6-fig. 4) and ( 7-fig. 4) and the electrical connector ( 5-fig. 4)of the mask are correctly connected to the stowage box. (2) Put the harness (1-fig. 4) behind the mask and goggles assembly (2-fig. 4). (3) Install the hose (11-fig. 4) as follows: 

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March 07, 2013 ATA 35 Initial issuance Page 6 / 13DASSAULT AVIATION Proprietary Data(a) Put the hose around the mask on blinker side (DETAIL A). (b) Make sure that the hose is in the middle of the mask to obtain a correct alignment when the LH and RH doors are closed. (4) Engage the harness side of the mask in the stowage box first. Then, engage the mask and goggles assembly. (5) Make sure that the mask is fully against the stops (9-fig. 4) as follows: (a) Push the mask regulator until it clicks into position in its housing. (b) Make sure that you do not hear oxygen flow out. NOTE: If you hear oxygen flow out of the stowage box, the oxygen mask is not correctly stowed against the stops. (6) Make sure that the hose is in contact with the blinker support (11-fig. 4) DETAIL B . (7) Close the LH and RH doors and make sure that the hose and the harness are not caught in the doors. (8) Set oxygen control lever ( 9531WY ) to "ON" (see fig. 1 ). (9) Perform a test of the stowage box (Refer to TASK 35-10-00-710-801 , paragraph "Operational test of the stowage box") (10) Make sure that the “PRESS-TO-TEST” button cannot be turned from the 100 % position without pushing on it. (11) If the “PRESS-TO-TEST” button can be turned, the mask is not correctly stored in the stowage box and must be stored again. (12) Make sure that you do not hear oxygen flow out. NOTE: If you hear oxygen flow out of the stowage box, the oxygen mask is not correctly stowed. (13) Get access to the CMC “ACTIVE MAINTENANCE MESSAGES” page ( Refer to TASK 45-10-00-910-801 ). (14) Make sure that the “35 10 CREW OXYGEN SYSTEM” selection does not show. (15) If the selection shows, make sure that the active maintenance messages that follow do not show on the CMC interface display: • " LH OXY MASK AND STOWAGE BOX FAIL "if you installed the LH crew oxygen mask and stowage box (L1002WH), • " 3RD OXY MASK AND STOWAGE BOX FAIL "if you installed the third crew member oxygen mask and stowage box (M1002WH). • " RH OXY MASK AND STOWAGE BOX FAIL "if you installed the RH crew oxygen mask and stowage box (R1002WH), (16) Set oxygen control lever ( 9531WY ) to "OFF" (see fig. 1 ). (17) De-energize the aircraft (Refer to TASK 24-00-00-860-803 ). I. FINAL STEPS (1) If you installed the LH crew oxygen mask stowage box or the RH crew oxygen mask stowage box: (a) Install the web (6-fig. 3) 

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March 07, 2013 ATA 35 Initial issuance Page 7 / 13DASSAULT AVIATION Proprietary Data(b) Install the washers (5-fig. 3) and screws (4-fig. 3). (c) Tighten the screws (4-fig. 3). (d) Put the trim strip (3-fig. 3) in position. (e) Install the washers (2-fig. 3) and screws (1-fig. 3) on the trim strip. (f) Tighten the screws (1-fig. 3). (g) Install LH pilot wrist rest ( L3001MP ) or RH pilot wrist rest ( R4001MP ). (h) On LH side, tighten the "Dzus" fasteners of the printer if installed. (2) Install the applicable linings that follow (fig. 2 ) (Refer to TASK 25-13-13-900-801 ): • ( 221UZ ) and ( 221VZ ) if you removed LH crew oxygen mask stowage box, • ( 221HZ )(and the pilot cabinet if installed) if you removed the third crew member oxygen mask stowage box, • ( 222UZ ) and ( 222VZ ) if you removed the RH crew oxygen mask stowage box. (3) If you removed LH crew oxygen mask stowage box, install LH pilot seat ( L1001MP )(Refer to TASK 25-11-01-900-801 ). (4) If you removed RH crew oxygen mask stowage box, install RH pilot seat ( R2001MP ) ( Refer to TASK 25-11-01-900-801 ). (5) Close oxygen cylinder upper access door ( 241BZ ). (6) Disconnect the electrical Ground Power Unit (GPU) (Refer to TASK 24-00-00-860-803 ). J. 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. 

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March 07, 2013 ATA 35 Initial issuance Page 8 / 13DASSAULT AVIATION Proprietary Data3. MATERIAL INFORMATION

A. MODIFICATION OF CREW OXYGEN MASK STOWAGE BOX

NEW P/N Q T Y KEY WORD OLD P/N

CSD30-005-3-8 with serial number lower than 1013 with suffix "A" or equal or higher than 1013 1 to 3 Crew oxygen mask stowage box CSD30-005-3-8 with serial number lower than 1013 without suffix "A"

NOTE: The crew oxygen mask stowage box removed must be sent to one of the addresses listed in paragraph 1.G. of this Service Bulletin. B. LOCAL PROCUREMENT • Lint-free cloth, • As indicated in Consumable Products Manual (CPM):

• leak detector 

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March 07, 2013 ATA 35 Initial issuance Page 9 / 13DASSAULT AVIATION Proprietary DataFigure 1: LOCATION OF THE OXYGEN CONTROL LEVER 

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March 07, 2013 ATA 35 Initial issuance Page 10 / 13Figure 2: LH AND RH CREW OXYGEN MASK STOWAGE BOXES - REMOVAL / INSTALLATION 1/2 

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March 07, 2013 ATA 35 Initial issuance Page 11 / 13Figure 3: LH AND RH CREW OXYGEN MASK STOWAGE BOXES - REMOVAL / INSTALLATION 2/2 

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March 07, 2013 ATA 35 Initial issuance Page 12 / 13Figure 4: CREW OXYGEN MASK REMOVAL / INSTALLATION



### END OF DOCUMENT 

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March 07, 2013 ATA 35 Initial issuance Page 13 / 13