1EFF : ALL 1 26-22-00Page 12 1 1 Feb 01/99R 1 1 1CES 1
R 8. BITE Test_________ (Ref. Fig. 003)
A. Automatic-Fire Extinguishing-Ground Test On the APU AUTO EXTING section of the overhead panel 50VU, the TEST pushbutton switch 31WF starts the test of the automatic fire-extinguishing system. This pushbutton switch operates the TEST ON relay 33WF:
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the ON indicator light in the TEST pushbutton switch comes on,
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the TEST ON relay 33WF connects the power supply from the circuit breaker 30WF the to EXTING GND TEST relay 38WF (this energizes the the EXTING GND TEST TIME DELAY relay 37WF and the AUTO TIME DELAY PUSH relay 39WF),
-after a time delay of 3 seconds the relay 37WF energizes the EXTING GND TEST relay 36WF which disconnects the automatic squib circuit of the fire extinguishing bottle, to prevent the fire bottle discharging,
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the relay 39WF energizes the HORN SUPPLY relay 4WC through the HORN OFF relay 44WF (the ground crew horn 15WC comes on),
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the relay 39WF also energizes the APU FIRE light 40WF on the external power panel 108VU (the red APU FIRE light 40WF comes on).
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the AUTO PUSH relay 34WF connects the 28VDC power supply from the circuit breakers 3WF and 4WF to the FIRE EMER STOP 1(2) relays 5WF and 6WF (this energizes the relays),
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the relays 5WF and 6WF connect the power supply from the circuit breakers 1QF and 2QF to the APU low-pressure fuel-shutoff-valve actuator 3QF (Ref. 28-29-00) (the APU low-pressure fuel-shutoff-valve 14QM closes),
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the relay 5WF also sends a signal to the APU Electronic Control Box (ECB) 59KD (Ref. 49-62-00) (the ECB 59KD starts the APU emergency shutdown sequence),
- on the APU AUTO/EXTING panel 50VU, the OK indicator light in the TEST pushbutton switch comes on (this indicates a successful test).
When you push the RESET switch 32WF:
-the the self-holding circuit of the relay TEST ON relay 33WF is de-energized,
-all other relays are de-energized. (the fire extinguishing bottle is connected again to the automatic fire-extinguishing on ground circuit),
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the ground crew horn 15WC and the APU FIRE light 40WF go off,
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the ON and OK indicator lights go off in the TEST pushbutton switch 31WF.
B. Squib and Discharge Test Operation When you push the TEST pushbutton switch on the APU FIRE panel 20VU the squib and discharge test starts. The TEST switch connects each cartridge resistor in line with one relay which are installed in the APU FIRE panel 20VU. When both relays are energized the SQUIB legend of the AGENT pushbutton switch comes on. Both resistors of the cartridge function correctly. The TEST pushbutton switch disconnects the normal pressure indication (DC GND signal) and simulates a pressure loss in the extinguisher bottle (bottle discharged). The disconnected GND signal triggers a relay via a transistor. The DISCH legend in the AGEND pushbutton switch comes on. The test stops when the TEST pushbutton switch is released.
APU FIRE EXTINGUISHING - DEACTIVATION/REACTIVATION
__________________________________________________
TASK 26-22-00-040-004 Bottle Weight Check
1. Reason for the Job
__________________
Refer to the MMEL TASK: 26-22-01
APU Fire Extinguishing
AGENT "DISCH" Light
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific warning notice
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
26-22-41-000-001 Removal of the Fire Extinguisher Bottle (11WF) 26-22-41-400-001 Installation of the Fire Extinguisher Bottle (11WF)
3. Job Set-up
__________ Subtask 26-22-00-010-058
A. Remove the APU fire extinguisher bottle (11WF) (Ref. TASK 26-22-41-000-001).
4. Procedure
_________
Subtask 26-22-00-280-052
A. Weigh the APU fire extinguisher bottle
(1) Make sure that the gross weight of the fire-extinguisher bottle is the same as the last weight shown on the identification plate, plus or minus 50 g (1.76 oz)).
NOTE : You must weigh the fire-extinguisher bottle without the
____ discharge head and the cartridge. Compare the weight shown on the fire-extinguisher bottle with the weight shown on the identification plate. You must reject the fire-extinguisher bottle if the gross weight is not in the limits. ________
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