- do a check of the connectors for looseness, bent pins, corrosion or contamination.
(a) If damage is found:
- clean, repair or replace as required (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002).
(b) If no damage is found and fault continues while maintenance message is never confirmed during the test:
- replace the PRESS SW-HCU (4102KS) (Ref. AMM TASK 78-31-16-000-040) and (Ref. AMM TASK 78-31-16-400-040).
(c) If the fault continues:
- repair or replace the defective harnesses J5 or J6 or thrust reverser harness (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002).
(d) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
F 『 EEFF : ALL E ∞∞78-31-00∞∞∞∞∞∞∞∞∞∞Page A229
E E May 01/05 ERE
ECES F 『 E C F M E E E E 56 E E E B. Do the test given in Para. 3.A.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
F 『 EEFF : ALL E ∞∞78-31-00∞∞∞∞∞∞∞∞∞∞Page A230
E E May 01/05 E E ECES
E
F 『
E C F M E
E E
E 56 E
E E
TASK 78-31-00-810-878
Thrust Reverser HCU Pressure-Switch Failed Open on Engine 2
1. Possible Causes
_______________
- PRESS SW-HCU (4102KS)
- harness J5
- harness J6
- thrust reverser harness
- junction box
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-51-44-000-002 Removal of the Thrust Reverser Harness 238W0908 AMM 71-51-44-400-002 Installation of the Thrust Reverser Harness 238W09098 AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit
(ECU)(4000KS) AMM 78-31-00-710-040 Operational Test of the Thrust Reverser System AMM 78-31-16-000-040 Removal of the Hydraulic Control Unit Pressure Switch
(4102KS) AMM 78-31-16-400-040 Installation of the Hydraulic Control Unit Pressure Switch (4102KS) ASM 73-25/16
3. Fault Confirmation
__________________
A. Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-040).
4. Fault Isolation
_______________
A. This fault message is generated if there is an HCU pressure switch failed in the open position.
(1) If the test gives the maintenance message TR PR SW, J5+J6, ECU:
- get access to the HCU,
- disconnect the harnesses J5 and J6 from the HCU pressure switch (4102KS),
- install jumper wires between pins 2 and 3 on the harness J5 connector and between pins 4 and 5 on the harness J6 connector,
- disconnect the harnesses J5 and J6 from the ECU (4000KS) and do a resistance check at each harness connector to the ECU (Ref. ASM 73-25/16) between:
F 『 EEFF : ALL E ∞∞78-31-00∞∞∞∞∞∞∞∞∞∞Page A231
E E May 01/05 E E ECES
E E 56 E
F 『
E C F M E
E E
E E
. pins 12 and 13 (<5 ohms)
. pins 12 and 11 (>10 megohms)
. pin 12 and the ground (>10 megohms).
(a) If the resistance values are in the specified limits:
- replace the PRESS SW-HCU (4102KS) (Ref. AMM TASK 78-31-16-000-040) and (Ref. AMM TASK 78-31-16-400-040).
(b) If the resistance values are out of the specified limits:
- do a continuity and insulation check of the harnesses between the ECU and the HCU pressure switch,
- repair or replace the defective harness J5 or harness J6 or thrust reverser harness or junction box (Ref. AMM TASK 71-51-44-000-002) and (Ref. AMM TASK 71-51-44-400-002).
(c) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(2) If the test does not give the maintenance message TR PR SW, J5+J6, ECU; this is indicative of an intermittent fault that may be caused by defective electrical contacts in the harnesses and junction box between the ECU and the HCU:
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 EXHAUST(60)
