- do a check of the thrust reverser harness connectors at the ECU, HCU and junction box for looseness, contamination or damaged pins,

 - clean, retighten or replace harness as required (Ref. AMM TASK 78-31-42-210-041).

 (a) If nothing is found:

 - no additional action is required.

 (b) If the fault becomes repetitive and is never confirmed during the operational test of the thrust reverser:

 - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
 1 If the fault continues:
_
 - replace the RELAY-THRUST REV INHIBITION, ENG 1 (14KS1) (Ref. ASM 73-25/16).
 2 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).
 3 If the fault continues:
_
 - replace the thrust reverser harness (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049).
 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.

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 TASK 78-31-00-810-819
 Failure of the Control of the Thrust-Reverser HCU Directional-Valve through the Channel A on Engine 2
 1. Possible Causes
_______________
 - HCU-THRUST REV (4101KS)

 - RELAY-THRUST REV INHIBITION, ENG 2 (14KS2)

 - ECU (4000KS)

 - thrust reverser harness

 - aircraft wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-51-43-000-049 Removal of the ECU (Channel A) to Thrust Reverser Junction Box Harnesses (4213KS) 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) 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 AMM 78-31-42-210-041 Detailed Visual Inspection of the electrical Harness AMM 78-31-51-000-042 Removal of the Hydraulic Control Unit AMM 78-31-51-400-042 Installation of the Hydraulic Control Unit ASM 73-25/16
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the thrust reverser system (2A) (Ref. AMM TASK 78-31-00-710-042).
 NOTE : The maintenance message HCU (TRDV), J5, ECU may be recorded in
____ the Post Flight Report (PFR) after a ground run and associated to ECAM warning ENG X REVERSER FAULT shown at engine shut down (with master lever in OFF position). If the ECU PN 1820M36P07 or 1820M89P07 is installed on the engine, the message is spurious. Only in this case, no trouble shooting action is required. The following trouble shooting procedure must be carried out if the failure was detected in any other condition than above described.
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 4. Fault Isolation
_______________
 A. The fault message is generated when the ECU detects an open circuit or a short to ground on the solenoid of the HCU directional valve on channel A or on associated electrical wiring.
 CAUTION : MAKE SURE THAT THERE IS NO HYDRAULIC PRESSURE WHILE YOU DO THIS
_______ TEST. PUT A WARNING NOTICE IN THE COCKPIT TO TELL PERSONS NOT TO PRESSURIZE THE HYDRAULIC SYSTEMS.
 (1) If the test gives the maintenance message HCU (TRDV), J5, ECU:
 - disconnect the harness from the connector B of the HCU and apply 28VDC between pin B/2 (+) and pin B/3 (-) on the HCU,

 - make sure that the value of the current is between 350 and 630 mA.

 (a) If the current is out of the specified limits:

 - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).

 (b) If the current is in the specified limits:

 - on the overhead panel 50VU, push and release the P/BSW-ENG/FADEC GND PWR/2 (7KS2) the ON legend comes on,
 - set the engine 2 throttle lever to the reverse thrust position,
　
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