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 A. Test
 CAUTION : STAY AWAY FROM THE TRAVEL RANGE OF THE BLOCKER DOORS DURING THE
_______
 TEST.

 (1) Do an operational test of the thrust reverser system for the FADEC 1B (Ref. AMM TASK 78-31-00-710-042). Visually monitor the blocker doors operation during the test.
 4. Fault Isolation
_______________
 A. The fault message HCU is generated if the thrust reverser stow time is greater than 8 seconds between the setting of the throttle from reverse to forward idle and the locking of the reverser blocker doors.
 (1) If all blocker doors stow simultaneously but slowly during the test:
 - do a check of the filter clogging pop out indicator of the reverser shut-off valve filter.
 (a) If the clogging pop out indicator is extended:

 - replace the shut-off valve filter (Ref. AMM TASK 78-37-51-600-002).

 (b) If the clogging pop out indicator is not extended:

 - 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 (3010KM1) 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 1 THR REV, G (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 2 Thrust Reverser
 1. Possible Causes
_______________
 - shut-off valve filter

 - HCU filter

 - CHECK VALVE-ENG 2 THR REV, Y

 - 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 -------------------------------------------------------------------------------
　
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