- do a check of the HCU filter clogging pop out indicator.
 1 If the HCU filter clogging pop out indicator is extended:
_ - replace the HCU filter (Ref. AMM TASK 78-31-51-920-001).
 2 If the clogging pop out indicator is not extended:
_
 - remove the hydraulic return line between the HCU and the check valve (3010KM2) at the pylon connection,

 - do an inspection for blockage or damage.

 a If there is blockage or damage:
_
 - clean or replace the CHECK VALVE-ENG 2 THR REV, Y (Ref. AMM TASK 29-11-35-000-001) and (Ref. AMM TASK 29-11-35-400-001) or HCU return line.
 b If nothing is found:
_
 - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
 c If the fault continues and slow reverser operation in the
_ stow sequence does not exceed 8 seconds during the test:
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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 (2) If the blocker doors do not stow simultaneously during the test:
 - do a manual deployment of the thrust reverser blocker doors (Ref. AMM TASK 78-32-41-860-001),

 - with the blocker doors in the deployed position, do a visual inspection of the structure and hydraulic lines (Ref. AMM TASK 78-31-41-210-003).

 (a) If you find damage:

 - replace the damaged parts.

 (b) If nothing is found and if one or more of the doors is (are) identified to move slower than the other ones during the test:

 - replace the defective: . ACTUATOR-BLOCKER DOOR, UPPER R (3001KM1) or/and . ACTUATOR-BLOCKER DOOR, LOWER R (3001KM2) or/and . ACTUATOR-BLOCKER DOOR, UPPER L (3001KM3) or/and . ACTUATOR-BLOCKER DOOR, LOWER L (3001KM4) (Ref. AMM TASK 78-31-41-000-001) and (Ref. AMM TASK 78-31-41-400-001).

 (c) If nothing is found:

 - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
 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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 Stow Time Too Long on Engine 1 Thrust Reverser
 1. Possible Causes
_______________
 - shut-off valve filter

 - HCU filter

 - CHECK VALVE-ENG 1 THR REV, G

 - HCU return line

 - HCU-THRUST REV (4101KS)

 - ECU (4000KS)

 - ACTUATOR-BLOCKER DOOR, UPPER R (3001KM1)

 - ACTUATOR-BLOCKER DOOR, LOWER R (3001KM2)

 - ACTUATOR-BLOCKER DOOR, UPPER L (3001KM3)

 - ACTUATOR-BLOCKER DOOR, LOWER L (3001KM4)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 29-11-35-000-001 Removal of the Engine 1 Thrust Reverser Check Valve (3010KM1) AMM 29-11-35-400-001 Installation of the Engine 1 Thrust Reverser Check
 Valve (3010KM1) 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 78-31-41-000-001 Removal of the Blocker Door Hydraulic Actuator
 (3001KM1,3001KM2,3001KM3, 3001KM4) AMM 78-31-41-210-003 Detailed Visual Inspection of the Door Actuator AMM 78-31-41-400-001 Installation of the Blocker Door Hydraulic Actuator
 (3001KM1,3001KM2,3001KM3, 3001KM4) AMM 78-31-51-000-042 Removal of the Hydraulic Control Unit AMM 78-31-51-400-042 Installation of the Hydraulic Control Unit AMM 78-31-51-920-001 Replacement of the Hydraulic Control Unit Filter AMM 78-32-41-860-001 Manual Deployment of the Blocker Door AMM 78-37-51-600-002 Replacement of the Thrust Reverser Hydraulic
 Isolation Valve Filter
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