1. Possible Causes
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- RELAY-FLIGHT/GROUND (43WF)
- RELAY-AUTO PUSH (34WF)
- PUSHBUTTON SWITCH-TEST (31WF)
- RELAY-AUTO TIME DELAY PUSH (39WF)
- wiring
- PUSHBUTTON SWITCH-RESET (32WF)
- RELAY-TEST (33WF)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 26-22-00-710-001 Operational Test of the APU Fire-Extinguishing
Loop/Squib
AMM 32-69-00-740-001 BITE Check Landing Gear Control Interface Unit (LGCIU) using MCDU to Ensure that Continuous BITE is Operative
AMM 33-14-00-710-001 Operational Test of the Annunciator Light Test System
in the Cockpit
ASM 26-22/02
ASM 26-22/02
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.
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 OK legend in the APU/AUTO/EXTING TEST p/bsw does not come on during the test:
- do the operational test of the annunciator light test system (Ref. AMM TASK 33-14-00-710-001).
(1) If the test gives a different maintenance message, you can find the related trouble shooting procedure in the applicable Page Block 101.
(2) If the fault continues:
- do the BITE test of the landing gear (Ref. AMM TASK 32-69-00-740-001).
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 of the RELAY-FLIGHT/GROUND (43WF) and replace it if necessary (Ref. ASM 26-22/02).
(4) If the fault continues:
- do a check of the RELAY-AUTO PUSH (34WF) and replace it if necessary (Ref. ASM 26-22/02).
(5) If the fault continues:
- do a check of the PUSHBUTTON SWITCH-TEST (31WF) and replace it if necessary (Ref. ASM 26-22/02).
(6) If the fault continues:
- do a check of the RELAY- AUTO DISCH (35WF) and replace it if necessary (Ref. ASM 26-22/02).
(7) If the fault continues:
- do a check of the RELAY-AUTO TIME DELAY PUSH (39WF) and replace it if necessary (Ref. ASM 26-22/02).
(8) If the fault continues:
- do a check and repair the wiring if necessary between the: LGCIU (5GA1) connector AA/15B and RELAY (43WF) connector A/X1, RELAY (43WF) connector A/A2 and RELAY (34WF) connector A/X1, RELAY (34WF) connector A/X1 an RELAY (39WF)connector A/A2 and A/X1, RELAY (34WF) connector A/A1 an RELAY (35WF)connector A/A1,
「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 210
May 01/05 CES
RELAY (34WF) connector A/A2 an RELAY (1LP) connector A/24,
RELAY (1LP) connector A/22 and P/BSW TEST (31WF) connector A/4
RELAY (43WF) connector A/X2 and GND,
PBSW TEST (31WF) connector A/A3 and C/B (30WF) (Ref. ASM 26-22/02)
and (Ref. ASM 26-22/02).
C. If the ON legend in the APU/AUTO/EXTING TEST p/bsw does not come on during the test: 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 FIRE PROTECTION 防火(111)
