- 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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