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Failure of the Control of the Thrust-Reverser HCU Pressurizing-Valve through the two Channels on Engine 2
1. Possible Causes
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- HCU-THRUST REV (4101KS)
- ECU (4000KS)
- J5, J6 and thrust reverser harnesses
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
78-31-00-810-827 Failure of the Control of the Thrust-Reverser HCU Pressurizing-Valve through the Channel A on Engine 2 78-31-00-810-828 Failure of the Control of the Thrust-Reverser HCU
Pressurizing-Valve through the Channel B on Engine 2 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
3. Fault Confirmation
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A. Test
(1) Do the operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-042).
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A. The fault messages are generated when the ECU detects an open circuit or a short to ground on both solenoids of the HCU pressurizing valve on channel A and channel B or on associated electrical wiring.
(1) If the test gives the maintenance message HCU (TRPV), J5, ECU then HCU (TRPV), J6, ECU:
- do the trouble shooting of each individual channel per respective trouble shooting procedure of the maintenance message HCU (TRPV) , J5, ECU (Ref. TASK 78-31-00-810-827) then HCU (TRPV) , J6, ECU (Ref. TASK 78-31-00-810-828).
(2) If the test does not give the maintenance message HCU (TRPV), J5, ECU then HCU (TRPV), J6, ECU is not confirmed; this indicates that the fault was intermittent and is no longer present,
- do a check of the J5, J6 and thrust reverser harnesses and of the junction box for absence of damage (Ref. AMM TASK 71-50-00-210-001),
- do a check of connectors for looseness, contamination, bent pins.
(a) If damage is found:
- retighten, clean or replace 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 maintenance message HCU (TRPV), J5, ECU then HCU (TRPV), J6, ECU 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).
(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 J5, J6 and thrust reverser harnesses (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.
(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 78-31-00-810-825
Failure of the Control of the Thrust-Reverser HCU Pressurizing-Valve through the Channel A on Engine 1
1. Possible Causes
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R - HCU-THRUST REV (4101KS)
R - ECU (4000KS)
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