- repair the fire protection system (Ref. TASK 26-21-00-810-803) and (Ref. TASK 26-21-00-810-804)

 - replace the engine fire-extinguisher bottles (Ref. AMM TASK 26-21-41-000-001) and (Ref. AMM TASK 26-21-41-400-001)

 - do the test given in Para. 4.C.

 C. Test
 - do the operational test of the fire protection system (Ref. AMM TASK 26-12-00-710-001) and (Ref. AMM TASK 26-12-00-710-002).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞26-21-00∞∞∞∞∞∞∞∞∞∞Page 242
 May 01/04R
 CES

 APU FIRE EXTINGUISHING - FAULT ISOLATION PROCEDURES
___________________________________________________
 TASK 26-22-00-810-801
 APU FIRE Signal Channel A and/or Channel B Fault
 1. Possible Causes
_______________
 - DETECTOR-APU FIRE (LOOP A) (21WG)

 - DETECTOR-APU FIRE (LOOP B) (22WG)

 - FDU-APU (13WG)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 26-13-15-000-001 Removal of the Sensing Elements 21WG and 22WG
 AMM 26-13-15-400-001 Installation of the Sensing Elements 21WG and 22WG
 AMM 26-13-34-000-001 Removal of the APU Fire-Detection Unit (FDU) (13WG)
 AMM 26-13-34-400-001 Installation of the APU Fire-Detection Unit (FDU)

 (13WG) AMM 26-22-00-710-001 Operational Test of the APU Fire-Extinguishing
 Loop/Squib AMM 31-50-00-710-001 Ground Scanning of the Central Warning System ASM 26-13/01
 3. Fault Confirmation
__________________
 A. The APU FIRE EXTINGUISHING PANEL 20VU (p/n 330TS08Y) has a fault. Special operation is necessary. Incorrect operation causes the APU fire extinguisher bottle to discharge. Airbus supplies a new 20VU panel that corrects this fault. See TFU 26.22.00.007 for more data.
 (1) Maintenance recommendation:
 (a) Before the test:

 - Pull the CIRCUIT BREAKER 30WF on panel 120VU.

 (b) During the test:

 - Push the APU FIRE TEST BUTTON quickly and fully.

 - Hold it fully during the test.

 - Release it quickly.

 (c) After the test:

 - Close the CIRCUIT BREAKER 30WF on panel 120VU.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞26-22-00∞∞∞∞∞∞∞∞∞∞Page 201
 May 01/05R
 CES

 (2) Do the operational test of the APU fire-extinguishing system (Ref. AMM TASK 26-22-00-710-001).
 4. Fault Isolation
_______________
R A. If the test gives a different maintenance message:
R - Do the trouble shooting procedure related to the maintenance message.
R

 B. If the test gives the maintenance message APU FIRE and the both red light rows in the APU FIRE PUSH p/bsw (20VU) come on.
 - replace the DETECTOR-APU FIRE (LOOP A) (21WG) and/or DETECTOR-APU FIRE (LOOP B) (22WG) (Ref. AMM TASK 26-13-15-000-001) and (Ref. AMM TASK 26-13-15-400-001).
 (1) If the fault continues:

 - replace the FDU-APU (13WG) (Ref. AMM TASK 26-13-34-000-001) and (Ref. AMM TASK 26-13-34-400-001).

 (2) If the fault continues:

 - do the operational test of the central warning system (Ref. AMM TASK 31-50-00-710-001)
R (a) If the test gives a different maintenance message:
R - Do the trouble shooting procedure related to the maintenance
R message.
R

 (3) If the fault continues:

 - do a check and repair the wiring if necessary between the: FDU (13WG) connector A/K and DETECTOR (21WG) connector A/A, FDU (13WG) connector A/J and DETECTOR (21WG) connector A/E, FDU (13WG) connector B/K and DETECTOR (22WG) connector A/A, FDU (13WG) connector B/J and DETECTOR (22WG) connector A/E (Ref. ASM 26-13/01).

 (4) If the fault continues:

 - do a check and repair the wiring if necessary between the: FDU (13WG) connector A/E and FWC (1WW1) connector AA/5C, FDU (13WG) connector A/M and FWC (1WW1) connector AA/4E, FDU (13WG) connector B/L and FWC (1WW1) connector AD/4G, FDU (13WG) connector B/E and FWC (1WW1) connector AD/5E, FDU (13WG) connector B/N and GND, FDU (13WG) connector B/B and GND, FDU (13WG) connector A/B and GND (Ref. ASM 26-13/01).
 C. Do the test as given in the Para. 3.A.
　
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