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 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-50-00-210-001 Visual Inspection of the Power Plant Wire Harness 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 78-31-51-000-042 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
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 A. Do the operational test of the thrust reverser system (2B) (Ref. AMM TASK 78-31-00-710-042).
 4. Fault Isolation
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 A. The fault message is generated when the ECU detects an open circuit or a short to ground on the solenoid of the HCU pressurizing valve on channel B or on associated electrical wiring.
 (1) If the test gives the maintenance message HCU (TRPV), J6, ECU:
 - disconnect the harness J6 from the ECU (4000KS),

 - apply 28VDC between pin 17 (+) and pin 18 (-) on harness J6 and do a check of the value of the current, which must be between 350 and 630 mA (Ref. ASM 73-25/16).

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

 - disconnect the channel B harness from the HCU-THRUST REV (4101KS) and do an insulation and continuity check of the harness J6 and thrust reverser harness between the ECU and the HCU connector A.
 1 If there is a fault:
_
 - repair or replace the harness J6 or the thrust reverser harness or the junction box (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049).
 2 If nothing is found:
_
R - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-
R 000-042) and (Ref. AMM TASK 78-31-51-400-042).
 (b) If the current is in the specified values: R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and R (Ref. AMM TASK 73-21-60-400-001).
 (2) If the test does not give the maintenance message HCU (TRPV), J6, ECU, this indicates that the fault was intermittent and is no longer present:

 - do a check of the harness J6, the thrust reverser harness and the junction box for absence of damage (Ref. AMM TASK 71-50-00-210-001),

 - do a check of the connectors for looseness, contamination, bent pins.

 (a) If damage is found:

 - clean, retighten or replace the harness as required (Ref. AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-049).

 (b) If no damage is found:

 - no additional action is required.

 (3) If the fault message HCU (TRPV), J6, ECU becomes repetitive and is

 never confirmed during the operational test of the thrust reverser: R - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-R 042) and (Ref. AMM TASK 78-31-51-400-042).
 (a) If the fault continues: R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and R (Ref. AMM TASK 73-21-60-400-001).

 (b) If the fault continues: R - replace the harness J6 and the thrust reverser harness (Ref. R AMM TASK 71-51-43-000-049) and (Ref. AMM TASK 71-51-43-400-

049).
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R  B. Do the test given in Para. 3.A. 
R  (1) No additional maintenance action is required if the fault is not 
R  confirmed. 
R  (2) Repeat the fault isolation procedure if the fault continues.

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 TASK 78-31-00-810-835
 Thrust-Reverser Blocker-Door Stow and Deploy Switches Feedback Disagree on Engine 1
 1. Possible Causes

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 2. Job Set-up Information
　
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