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Stow Time Too Long on Engine 1 Thrust Reverser
1. Possible Causes
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- 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
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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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A. Test
CAUTION : STAY AWAY FROM THE TRAVEL RANGE OF THE BLOCKER DOORS DURING THE
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TEST.
(1) Do an operational test of the thrust reverser system for the FADEC 1A (Ref. AMM TASK 78-31-00-710-042). Visually monitor the blocker doors operation during the test.
4. Fault Isolation
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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:
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- 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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