-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: 26-22-02
APU Fire Extinguishing
AGENT "SQUIB" Light
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s) No specific multimeter No specific warning notice No specific 600 ohm boomset No specific 600 ohm headset No specific access platform 2.5 m (8 ft. 2 in.) 2-100831-1 1 SHUNT PLUG - FIRE EXTINGUISHER CARTRIDGE
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 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power
3. Job Set-up
__________
Subtask 26-22-00-941-059
A. Put the warning notice in position on the overhead panel 25VU to tell persons not to operate the APU.
Subtask 26-22-00-865-071
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
-------------------------------------------------------------------------------
R 121VU APU/FIRE/EXTIG/SQUIB/B 2WF L39
R 121VU APU/FIRE/EXTIG/SQUIB/A 1WF L38
Subtask 26-22-00-860-058
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)
On the overhead panel 50VU, make sure that the ON legend on the SVCE INT OVRD pushbutton switch is off.
(4)
In Zone 314, connect the 600 ohm boomset to the service interphone jack.
Subtask 26-22-00-010-059
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 connector 12WF-A.
(4)
Disconnect the connector 12WF-A from the cartridge 12WF.
(5)
Put a SHUNT PLUG - FIRE EXTINGUISHER CARTRIDGE (2-100831-1) on the cartridge 12WF.
(6)
On the electrical connector 12WF-A, temporarily ground the pins A and
B. Subtask 26-22-00-865-072
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1WF, 2WF.
4. Procedure
_________ Subtask 26-22-00-710-067
A. Operational Test of the Fireing Circuit and the Test Circuit 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 electrical connector 12WF-A:
-remove the temporary ground connection from the pins A and
B.
2. On the electrical connector 12WF-A:
-connect a multimeter between pin A and a ground.
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