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4. Fault Isolation
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A. If the REV indication does not stay amber on the upper ECAM display unit with the DMC3 switched on:
(1) Replace the DMC-1 (1WT1) (Ref. AMM TASK 31-63-34-000-001) and (Ref. AMM TASK 31-63-34-400-001).
B. If the REV indication stays amber on on the upper ECAM display unit with the DMC3 switched on:
(1) Manually unlock the latches to make sure that the blocker doors operate correctly.
(a) If the blocker door does not operate correctly:
- replace the defective: LATCH-BLOCKER DOOR, UPPER R (3002KM1) or LATCH-BLOCKER DOOR, LOWER R (3002KM2) or LATCH-BLOCKER DOOR, LOWER L (3002KM3) or LATCH-BLOCKER DOOR, LOWER L (3002KM4) (Ref. AMM TASK 78-31-19-000-001) and (Ref. AMM TASK 78-31-19-400-001).
(2) If the fault continues:
- manually release the actuator to make sure that the blocker door or the hydraulic actuator operates correctly.
(a) If the blocker door does not operate correctly:
- replace the defective lower blocker door (Ref. AMM TASK 78-32-41-000-001) (Ref. AMM TASK 78-32-41-400-001) or
- replace the defective upper blocker door (Ref. AMM TASK 78-32-41-000-002) (Ref. AMM TASK 78-32-41-400-002).
(b) If the hydraulic actuator does not operate correctly:
- replace the defective: ACTUATOR-BLOCKER DOOR, UPPER R (3001KM1) or ACTUATOR-BLOCKER DOOR, LOWER R (3001KM2) or ACTUATOR-BLOCKER DOOR, UPPER L (3001KM3) ACTUATOR-BLOCKER DOOR, LOWER L (3001KM4) (Ref. AMM TASK 78-31-41-000-001) (Ref. AMM TASK 78-31-41-400-001).
C. Do the operational test of the thrust reverser system (Ref. AMM TASK 78-
31-00-710-042). R
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THRUST REVERSER CONTROL AND INDICATING - FAULT ISOLATION PROCEDURES
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TASK 78-31-00-810-801
Failure of the Hydraulic Pressurizing Valve on Engine 1
1. Possible Causes
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- HCU-THRUST REV (4101KS)
- ECU (4000KS)
- HCU pressure switch (4102KS)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 78-31-00-710-042 Operational Test of the Thrust Reverser System
R 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) AMM 78-31-51-000-042 Removal of the Hydraulic Control Unit AMM 78-31-51-400-042 Installation of the Hydraulic Control Unit
3. Fault Confirmation
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A. Test
(1) Make sure that the thrust reverser system is not mechanically deactivated (Inhibition pin on HCU).
(2) Do the operational test of the thrust reverser system (1A) (MENU mode test) (Ref. AMM TASK 78-31-00-710-042). Make sure that the hydraulic pressure is correct during the test. The pressure must not drop below the advisory threshold.
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4. Fault Isolation
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A. The fault message is generated if a position fault is detected on the HCU pressurizing valve (valve detected not open when reverse is commanded). The HCU pressurizing valve position monitoring is based upon the output signal of the HCU pressure switch (4102KS):
- if the switch is closed, there is no pressure,
- if the switch is open, the valve is pressurized.
(1) If the test does not give the maintenance message HCU (TRPV), HYD and the thrust reverser blocker doors deploy and stow normally:
- no further action is required.
(a) If the fault becomes repetitive:
- do the trouble shooting as if the maintenance message was confirmed on test.
(2) If the test does not give the maintenance message HCU (TRPV), HYD and the blocker doors do not deploy or stow normally: 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(6)
