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 Failure of the Hydraulic Pressurizing Valve on Engine 1
 1. Possible Causes
_______________
 - HCU-THRUST REV (4101KS)

 - ECU (4000KS)

 - HCU pressure switch (4102KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
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 78-31-16-000-041 Removal of the Hydraulic Control Unit Pressure Switch

 (4102KS) AMM 78-31-16-400-041 Installation of the Hydraulic Control Unit Pressure
 Switch (4102KS) 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
__________________
 A. Test
 (1) Make sure that the thrust reverser system is not mechanically deactivated (Inhibition pin on HCU).

 (2) Do the operational test of the thrust reverser system (1B) (MENU mode test) (Ref. AMM TASK 78-31-00-710-042). Make sure that the hydraulic pressure is correct during the test. The pressure must not drop below the advisory threshold.

 4. Fault Isolation
_______________
 A. The fault message is generated if a position fault is detected on the HCU pressurizing valve (valve detected not open when reverse is commanded). The HCU pressurizing valve position monitoring is based upon the output signal of the HCU pressure switch (4102KS):
 - if the switch is closed, there is no pressure,

 - if the switch is open, the valve is pressurized.

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 (1) If the test does not give the maintenance message HCU (TRPV), HYD and the thrust reverser blocker doors deploy and stow normally:

 - no further action is required.
 (a) If the fault becomes repetitive:
 - do the trouble shooting as if the maintenance message was confirmed on test.

 (2) If the test does not give the maintenance message HCU (TRPV), HYD and the blocker doors do not deploy or stow normally:

 - 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).

 (3) If the test gives the maintenance message HCU (TRPV), HYD and the thrust reverser blocker doors deploy and stow normally:

 - replace the HCU pressure switch (4102KS) (Ref. AMM TASK 78-31-16-000-041) and (Ref. AMM TASK 78-31-16-400-041).

 (4) If the test gives the maintenance message HCU (TRPV), HYD and the blocker doors do not deploy or stow normally:

 - 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. Do the test given in Para. 3.A.
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 Failure of the Hydraulic Pressurizing Valve on Engine 2
 1. Possible Causes
_______________
 - HCU-THRUST REV (4101KS)

 - ECU (4000KS)

 - HCU pressure switch (4102KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
　
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