- make sure that they are locked (flush with the forward frame of the thrust reverser).

 (2) With the fans cowls open, grab each blocker door at the leading edge and make sure that the door cannot move from the stow position.

 NOTE : The fault is generated if at least one blocker door is
____ detected unstowed by the FADEC. If the ECAM warning ENG 1 REVERSER FAULT was also associated to the warning ENG 1 REVERSER UNLOCKED, this indicates that the FADEC auto-restow function was activated. If this was the case, pay particular attention to the rigging of the blocker doors (Ref. AMM TASK 78-32-41-820-001).
 NOTE : The ECU (4000KS) is the less probable cause of this fault.
____
 4. Fault Isolation
_______________
 A. If one of the blocker doors is found unlocked or opens during the manual check:
 - replace the defective LATCH-BLOCKER DOOR, UPPER R (3002KM1) or LATCH-BLOCKER DOOR, LOWER R (3002KM2) or LATCH-BLOCKER DOOR, LOWER L (3002KM3) or LATCH-BLOCKER DOOR, UPPER L (3002KM4), (Ref. AMM TASK 78-31-19-000-001) and (Ref. AMM TASK 78-31-19-400-001).
 (1) If the fault continues:
 - do a check of the HCU filter pop-out indicator (Ref. AMM TASK 78-31-51-210-041).
 (a) If extended:
 - replace the HCU filter (Ref. AMM TASK 78-31-51-920-001).
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 E 56 E E E (b) If the fault continues:

 - replace the associated blocker door actuator: ACTUATOR-BLOCKER DOOR, UPPER R (3001KM1) or ACTUATOR-BLOCKER DOOR, LOWER R (3001KM2) or ACTUATOR-BLOCKER DOOR, UPPER L (3001KM3) or ACTUATOR-BLOCKER DOOR, LOWER L (3001KM4) (Ref. AMM TASK 78-31-41-000-001) and (Ref. AMM TASK 78-31-41-400-001).
 B. If more than one blocker door is found unlocked or opens during the
 manual check:

 - 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 all of the blocker doors are found steadily locked (flush with forward frame of the thrust reverser):
 - make sure that the fault has not been triggered due to improper stowage of the blocker doors due to previous maintenance action on the thrust reverser. If the blocker doors were not properly stowed, the warning may have resulted from the activation of the FADEC auto-restow function.
 (1) If you confirm that this was the case:

 - do an operational test of the thrust reverser (Ref. AMM TASK 78-31-00-710-042).
 (a) If there is no fault and the blocker doors are properly locked after the test:

 - no further maintenance action is required.

 (b) If the fault continues:

 - continue the trouble shooting procedure as described in Para. 4.C.(2)(a).

 (2) If you cannot confirm that previous maintenance action was the cause:

 (a) Disconnect the thrust reverser harness at the lower R/H stow switch (4104KS2) and do an electrical resistance check between: . pins 2 and 5 (<5 ohms) . pins 4 and 9 (<5 ohms) . pins 2 and 3 (>10 megohms) . pins 4 and 7 (>10 megohms) . pin 2 and the ground (>10 megohms) . pin 9 and the ground (>10 megohms) . pin 3 and the ground (>10 megohms) . pin 7 and the ground (>10 megohms).
 1 If the resistance values are out of the specified limits:
_
 - replace the SW-BLOCKER DOOR STOW, LOWER R (4104KS2), (Ref. AMM TASK 78-31-18-000-001) and (Ref. AMM TASK 78-31-18-400-001).
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ECES  F 『 E C F M E E E E 56 E E E 2 If the resistance values are in the specified limits:

_
 - manually deploy the thrust reverser blocker doors (Ref. AMM TASK 78-32-41-860-001) and do an electrical resistance check between: . pins 2 and 3 (<5 ohms) . pins 4 and 7 (<5 ohms) . pins 2 and 5 (>10 megohms) . pins 4 and 9 (>10 megohms).
 a If the resistance values are out of the specified limits:
_
 - replace the SW-BLOCKER DOOR STOW, LOWER R (4104KS2), (Ref. AMM TASK 78-31-18-000-001) and (Ref. AMM TASK 78-31-18-400-001).
 (b) Repeat the above electrical checks for other switches (SW-BLOCKER DOOR STOW, UPPER R (4104KS1), SW-BLOCKER DOOR STOW, LOWER L (4104KS3), SW-BLOCKER DOOR STOW, UPPER L (4104KS4)) and replace as necessary (Ref. AMM TASK 78-31-18-000-001) and (Ref. AMM TASK 78-31-18-400-001).

 (c) If the resistance values are in the specified limits:

 - reconnect the thrust reverser harness at each stow switch, manually stow all the blocker doors and disconnect harnesses J5 and J6 from the ECU,
　
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