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 3. On the APU FIRE panel 20VU:
-lift the guard then push and release the APU FIRE pushbutton switch.
 -push and hold the APU AGENT pushbutton switch.
On the multimeter
-0 VDC is shown.
On the multimeter
-28 VDC is shown.
 NOTE : Ignore the APU AGENT SQUIB legend and other subsequent effects.
____
 4. On the APU FIRE panel 20VU:  On the multimeter
 - release APU AGENT pushbutton  - 0 VDC is shown.
 switch.
 5. On the electrical connector  On the multimeter
 12WF-A:  - 0 VDC is shown.
 - connect the multimeter between
 pin B and a ground.
 6. On the APU FIRE panel 20VU:  On the multimeter
 - push and hold the APU AGENT  - 28 VDC is shown.
 pushbutton switch.
 7. On the APU FIRE panel 20VU:  On the multimeter
 - release APU AGENT pushbutton  - 0 VDC is shown.
 switch.
 8. On the APU FIRE panel 20VU:
 - push and latch the APU FIRE
 pushbutton switch.
 - put the guard of the APU
 pushbutton switch in the
 correct position.

 1EFF : ALL 1 26-22-00Page 409 1 1 May 01/05R 1 1 1CES 1

 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------NOTE : If the test is correct,
____
 the firing system will
 operate correctly. The
 test system is defective.

 NOTE : If the test is not correct
____
 (no voltage), the firing
 system is defective and do
 the applicable trouble
 shooting procedure.

 5. Close-up
________
 Subtask 26-22-00-865-073
 A. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/FIRE/EXTIG/SQUIB/B 2WF L39 121VU APU/FIRE/EXTIG/SQUIB/A 1WF L38
 Subtask 26-22-00-410-060
 B. Put the aircraft back to its initial configuration.
 (1)
 Remove the SHUNT PLUG - FIRE EXTINGUISHER CARTRIDGE (2-100831-1) from the cartridge 12WF.

 (2)
 Make sure that the electrical connectors are clean and in the correct condition.

 (3)
 Connect the connector 12WF-A to the cartridge 12WF.

 (4)
 Safety the connector 12WF-A with corrosion-resistant steel lockwire

 0.8 mm (0.032 in.) dia.

 (5)
 Disconnect the 600 ohm boomset from the service interphone jack.

 (6)
 Disconnect the 600 ohm headset from the CAPT jack panel.

 (7)
 Make sure that the work area is clean and clear of tool(s) and other items.

 1EFF : ALL 1 26-22-00Page 410 1 1 May 01/05R 1 1 1CES 1

 (8)
 Close the access door 314AR.

 (9)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 (10)
 Remove the access platform(s).

 (11)
 Remove the warning notice from the panel 25VU.

 (12)
 Put the warning notice in the cockpit to tell the flight crew that the APU AGENT SQUIB light is deactivated.

 (13) Make an entry in the aircraft technical logbook. Subtask 26-22-00-865-074
 C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WF, 2WF.
 Subtask 26-22-00-860-059
 D. Put the aircraft back to its initial configuration.
 (1) De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002).

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 INTENTIONALLY BLANK

R 1 1

26-22-00Page 412
1 1 May 01/05 1 1 1CES 1 TASK 26-22-00-040-006

 Test Circuit Verification
 WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE
_______ YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
 WARNING : THE CARTRIDGE IS AN EXPLOSIVE DEVICE. REMOVE IT BEFORE YOU
_______ DISASSEMBLE THE FIRE EXTINGUISHER BOTTLE. TO PREVENT INJURY TO THE PERSONNEL BECAUSE OF THE EXPLOSION OF THE CARTRIDGE IF IT HAS NOT BEEN FIRED:
 -INSTALL A SHUNT DEVICE.

 -THIS WILL SHUNT THE PINS TOGETHER ON THE CARTRIDGE BEFORE ITS
 REMOVAL.
 DO NOT USE A FOIL SHUNT.

 1. Reason for the Job
__________________
 Refer to the MMEL TASK: 26-22-04
　
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