- disconnect the harness J5 from the ECU then install a jumper wire between pins 2 and 3 on the thrust reverser harness J5 connector to the HCU,

 - do a continuity check between pins 7 and 8 of the harness J5.

 1 If there is no continuity:
_
 - remove the jumper wire from the harness pins 2 and 3,

 - replace the RELAY-THRUST REV INHIBITION, ENG 2 (14KS2) (Ref. ASM 73-25/16).

 a If the fault continues:
_
 - do a check of the thrust reverser harness including junction box and the aircraft wiring for open circuit (Ref. AMM TASK 78-31-42-210-041).
 b If there is no continuity:
_ - repair or replace as required (Ref. ASM 73-25/16).
 c If nothing is found:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 2 If there is continuity:
_
 - remove the jumper wire from the harness pins 2 and 3,

 - do a resistance check at the harness J5 connector to the ECU between: . pins 7 and 11 (>10 megohms) . pins 7 and 8 (>10 megohms) . pin 7 and the ground (>10 megohms).

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 F 『 E C F M E E E E 56 E E E a If the resistance values are out of the specified limits:

_
 - repair or replace the thrust reverser harness (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049), or the aircraft wiring between the ECU and the HCU (Ref. ASM 73-25/16).
 b If the resistance values are in the specified limits:
_
 - 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 HCU (TRDV), J5, ECU:
 - this indicates that the fault was intermittent and is no longer present,

 - 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 2 (14KS2) (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 78-31-00-810-820
 Failure of the Control of the Thrust-Reverser HCU Directional-Valve through the Channel B 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 (2B) (Ref. AMM TASK 78-31-00-710-042).
　
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