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R R R R R  WARNING : DO NOT TOUCH THE DISCHARGE CARTRIDGES UNLESS YOU ARE APPROVED TO DO_______ WORK WITH CLASS "C" EXPLOSIVES. YOU MUST CAREFULLY OBEY THE APPROVED PROCEDURE FOR THIS TASK. TO PREVENT THE EXPLOSION OF THE CARTRIDGE, MAKE SURE THAT YOU INSTALL AN ELECTROSTATIC PROTECTIVE CAP ON THE DISCHARGE CARTRIDGE WHEN YOU DO THIS TASK.
 1. Reason for the Job__________________
 Refer to the MMEL TASK: 26-22-04 APU Fire Extinguishing - APU FIRE Test
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific No specific No specific No specific No specific No specific 30840007  circuit breaker(s) safety clip(s)multimeterwarning notice600 ohm boomset600 ohm headsetaccess platform 2.5 m (8 ft. 2 in.)1 SHUNT DEVICE - SUPERSEDED BY 2-100831-1
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
No specific  corrosion-resistant steel lockwire 0.8 mm (0.032 in.) dia.

 

 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 24-41-00-862-002
3. Job Set-up
__________ Subtask 26-22-00-941-065
Energize the Aircraft Electrical Circuits from the External PowerDe-energize the Aircraft Electrical Circuits Supplied from the External Power
 A. Put the warning notice in position on the overhead panel 25VU to tell persons not to operate the APU. 
R  Subtask 26-22-00-865-099 
R  B. Open, safety and tag this(these) circuit breaker(s): 
R R R R R R R  -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/FIRE/EXTIG/SQUIB/B 2WF L39 121VU APU/FIRE/EXTIG/SQUIB/A 1WF L38 121VU APU/FIRE/LP VALVE/NORM 4WF M42 121VU APU/FIRE/LP VALVE/STBY 3WF M41
 Subtask 26-22-00-860-072 
R  C. Aircraft Maintenance Configuration
 (1) Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
 (2) On the CAPT jack panel, connect the 600 ohm headset to the related connector.
 (3) Remove the snapwire from the APU FIRE pushbutton switch on panel 20VU.
 (4) In Zone 314, connect the 600 ohm boomset to the service interphone jack.
 (5) Energize the Annunciator Light Test Dimming system.

 

 Subtask 26-22-00-010-067 
R  D. Get Access
 (1) Put the access platform in position below the access door 314RA.
 (2) Open the access door 314AR.
 (3) Remove and discard the lockwire from the electrical connector 12WF-A.
 (4) Disconnect the electrical connector 12WF-A from the cartridge 12WF.
 (5) Put a SHUNT DEVICE - SUPERSEDED BY 2-100831-1 (30840007) on the cartridge 12WF.
 Subtask 26-22-00-865-100 
R  E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WF, 2WF, 3WF, 4WF.
 4. Procedure_________
 Subtask 26-22-00-710-076
 A. Operational Test of the Test Circuit 
R R R R R R  WARNING : MAKE SURE THAT YOU WILL NOT CAUSE UNWANTED CHANGES TO OTHER_______ SYSTEMS BEFORE YOU PUSH THE APU FIRE PUSHBUTTON SWITCH. WHEN YOU PUSH THE APU FIRE PUSHBUTTON SWITCH, THESE VALVES CLOSE : - LP FUEL SHUTOFF VALVE (APU) - FUEL SOLENOID VALVE (APU) - BLEED AIR VALVE (APU)
 NOTE : For this test procedure we recommend that a minimum of two persons____ are in constant contact with each other through the service interphone system. One person must monitor the cockpit APU FIRE panel 20VU, the other person must be at Zone 313.

 

 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the connector 12WF-A:
-connect a multimeter between terminal A and ground, and then between terminal B and ground.
2. On the APU FIRE panel 20VU:
-push the APU FIRE pushbutton switch.
3. On the APU FIRE panel 20VU:
-press and hold the SQUIB
pushbutton switch.

4. On the APU FIRE panel 20VU:
-release the SQUIB pushbutton switch.
5. On the APU FIRE panel 20VU:
-push to release the APU FIRE pushbutton switch.
　
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