(3002KM1,3002KM2,3002KM3,3002KM4) AMM 78-31-19-400-001 Installation of the Blocker Door Latches (3002KM1,3002KM2,3002KM3,3002KM4) AMM 78-31-41-000-001 Removal of the Blocker Door Hydraulic Actuator (3001KM1,3001KM2,3001KM3, 3001KM4) 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
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 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 78-31-51-210-041 Check of the Indicator of Thrust-Reverser
 Hydraulic-Control-Unit Filter 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 ASM 73-25/16
 3. Fault Confirmation
__________________
 A. Make sure that the thrust reverser is not inhibited.
 (1) Do an operational test of the thrust reverser system (1A and 1B) (Ref. AMM TASK 78-31-00-710-042).
 NOTE : If the thrust reverser does not deploy or is slow to deploy,
____ do a check of the thrust reverser test result and the Post Flight Report (PFR). If any thrust reverser related fault message is present, do the relevant trouble shooting procedure.
 4. Fault Isolation
_______________
 A. If no message is present:
 - replace the HCU-THRUST REV (4101KS) (Ref. AMM TASK 78-31-51-000-042) and (Ref. AMM TASK 78-31-51-400-042).
 (1) If the fault continues:

 - replace the CTL UNIT-THROTTLE, ENG 1 (8KS1) (CTL UNIT-THROTTLE, ENG 2 (8KS2)) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).

 (2) If the fault continues:

 - replace the RELAY-THRUST REV INHIBITION, ENG 1 (14KS1) ( RELAY-THRUST REV INHIBITION, ENG 2 (14KS2)) (Ref. ASM 73-25/16).

 (3) If the fault continues:

 - remove the CHECK VALVE-ENG 1 THR REV, G (3010KM1) (Ref. AMM TASK 29-11-35-000-001) (CHECK VALVE-ENG 2 THR REV, Y (3010KM2) (Ref. AMM TASK 29-13-35-000-001)),

 - do a check of the valve for signs of damage or contamination,

 - clean or replace as required (Ref. AMM TASK 29-11-35-400-001) ( (Ref. AMM TASK 29-13-35-400-001)).

 (a) If contamination is found:
 - do a check of the HCU filter for contamination (Ref. AMM TASK 78-31-51-210-041).
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_
 - replace the HCU filter and flush the hydraulic circuit (Ref. AMM TASK 78-31-51-920-001).
 (b) If nothing is found and none of the doors deploy:
 NOTE : The thrust reverser latches and actuators opening sequence
____ is set as follows: first LATCH-BLOCKER DOOR, LOWER R (3002KM2), second LATCH-BLOCKER DOOR, UPPER R (3002KM1), third LATCH-BLOCKER DOOR, UPPER L (3002KM4), fourth LATCH-BLOCKER DOOR, LOWER L (3002KM3), the door will deploy only if all latches are opened.
 - replace successively the four blocker doors latches (Ref. AMM TASK 78-31-19-000-001) and (Ref. AMM TASK 78-31-19-400-001) according to the opening sequence of the latches.
 1 If nothing is found but at least one blocker door deploys:
_
 - replace successively the ACTUATOR-BLOCKER DOOR, UPPER R (3001KM1) (ACTUATOR-BLOCKER DOOR, LOWER R (3001KM2)) ( ACTUATOR-BLOCKER DOOR, LOWER L (3001KM3)) (ACTUATOR-BLOCKER DOOR, UPPER L (3001KM4)) of the doors that do not deploy (Ref. AMM TASK 78-31-41-000-001) and (Ref. AMM TASK 78-31-41-400-001).
 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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 Failure of the Thrust Reverser Deploy Indication
 1. Possible Causes_______________
 - SW-BLOCKER DOOR DEPLOY, L (4103KS1)
　
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