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- disconnect the harnesses J5 and J6 from the HCU pressure switch
- install jumper wires between pins 2 and 3 for the harness J5 and between pins 4 and 5 for the harness J6
- disconnect the harnesses J5 and J6 from the ECU (4000KS) and do a resistance check of the harnesses J5 and J6 between: . 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 78-31-16-000-041) and (Ref. AMM TASK 78-31-16-400-041).
(b) If the resistance values are out of the specified limits:
- replace the defective harness J5 (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049) or harness J6 (Ref. AMM TASK 71-51-43-000-004) and (Ref. AMM TASK 71-51-43-400-004).
(3) 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).
B. Do the test given in Para. 3. A.
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TASK 78-31-00-810-860
Failure of the Thrust Reverser Pressure Switch in the Open Position on the
Engine 2
1. Possible Causes
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- PRESS SW-HCU (4102KS)
- harness J5
- harness J6
- ECU (4000KS)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 71-51-43-000-004 Removal of the ECU (Channel B) to Thrust Reverser Junction Box Harnesses (4214KS) AMM 71-51-43-000-049 Removal of the ECU (Channel A) to Thrust Reverser Junction Box Harnesses (4213KS) AMM 71-51-43-400-004 Installation of the ECU (Channel B) to thrust Reverser Junction Box Harnesses (4214KS) AMM 71-51-43-400-049 Installation of the ECU (Channel A) to Thrust
Reverser Junction Box Harnesses (4213KS) 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 78-31-00-710-042 Operational Test of the Thrust Reverser System AMM 78-31-16-000-041 Removal of the Hydraulic Control Unit Pressure Switch
(4102KS) AMM 78-31-16-400-041 Installation of the Hydraulic Control Unit Pressure Switch (4102KS) ASM 73-25/16
3. Fault Confirmation
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A. Do the operational test of the thrust reverser system (2A and 2B) (Ref. AMM TASK 78-31-00-710-042).
4. Fault Isolation
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A. If the test gives the maintenance message TR PR SW, J5+J6, ECU:
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 EXHAUST(46)
