- remove the EIU2 (1KS2) (Ref. AMM TASK 73-25-34-000-040),
- do a continuity and an insulation check of the wiring between pin A/X of the relay base 14KS2 and pin AA/10A of the EIU2 (1KS2) (Ref. ASM 73-25/16).
1 If there is an open circuit or a short to ground:
_ - repair the wiring.
2 If nothing is found :
_
- do a continuity check (insulation check not required) of the wiring (Ref. ASM 73-25/16) between: . the EIU2 (1KS2) pin AA/4C and the TCU2 (8KS2) pin E/C . the EIU2 (1KS2) pin AA/4A and the TCU2 (8KS2) pin E/C.
a If there is an open circuit:
_ - repair the associated wiring.
b If nothing is found:
_
- replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
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E 56 E E E c If the fault continues:
_
- replace the CTL UNIT-THROTTLE, ENG 2 (8KS2) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
(2) If the test does not give the maintenance message DIR VLV, J5, ECU then DIR VLV, J6, ECU:
- replace the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) (Ref. ASM 73-25/16).
(a) 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) If the fault continues:
- replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
(c) If the fault continues:
- replace the CTL UNIT-THROTTLE, ENG 2 (8KS2) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
B. Do the test given in Para. 3.
(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 78-31-00-810-817
Failure of the Control of the Thrust-Reverser HCU Directional-Valve through the Channel A on Engine 1
1. Possible Causes
_______________
- HCU-THRUST REV (4101KS)
- RELAY-THRUST REV INHIBITION, ENG 1 (14KS1)
- 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 (1A) (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.
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