W DOC AIRBUS | TSM A320F

Failure of the Thrust Reverser Blocker Door(s) or T/R Indication Failure on the Engine 2


TASK 78-31-00-810-864-A
Failure of the Thrust Reverser Blocker Door(s) or T/R Indication Failure on the Engine 2


1. Possible Causes
  • ACTUATOR-BLOCKER DOOR, UPPER R [3001KM1]
  • ACTUATOR-BLOCKER DOOR, LOWER R [3001KM2]
  • ACTUATOR-BLOCKER DOOR, LOWER L [3001KM3]
  • ACTUATOR-BLOCKER DOOR, UPPER L [3001KM4]
  • LATCH-BLOCKER DOOR, UPPER R [3002KM1]
  • LATCH-BLOCKER DOOR, LOWER R [3002KM2]
  • LATCH-BLOCKER DOOR, LOWER L [3002KM3]
  • LATCH-BLOCKER DOOR, UPPER L [3002KM4]
  • HCU-THRUST REV (4101KS)
  • SW-BLOCKER DOOR STOW, UPPER R [4104KS1]
  • SW-BLOCKER DOOR STOW, LOWER R [4104KS2]
  • SW-BLOCKER DOOR STOW, LOWER L [4104KS3]
  • SW-BLOCKER DOOR STOW, UPPER L [4104KS4]
  • ECU [4000KS]
  • HARNESS-ECU TO THRUST REVERSER JUNCTION BOX CHAN A [4213KS]
  • HARNESS-ECU TO THRUST REVERSER JUNCTION BOX, CHAN B [4214KS]
  • HARNESS-JUNCTION BOX TO THRUST REVERSER, CHAN A/B [4200KS]
  • ECU-1 [4000KS1]
  • ECU-2 [4000KS2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 71-51-43-000-041
Removal of the Thrust Reverser Harness 238W0908
AMM 71-51-43-000-049
Removal of the ECU (Channel A) to Thrust Reverser Junction Box Harnesses
AMM 71-51-43-400-041
Installation of the Thrust Reverser Harness 238W0908
AMM 71-51-43-400-049
Installation of the ECU (Channel A) to Thrust Reverser Junction Box Harnesses
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 78-30-00-081-041
Make the Thrust Reverser Serviceable after Maintenance
AMM 78-30-00-481-041
Make the Thrust Reverser Unserviceable for Maintenance
AMM 78-31-00-710-040
Operational Test of the Thrust Reverser System
AMM 78-31-00-710-042
Operational Test of the Thrust Reverser System
AMM 78-31-18-000-001
Removal of the Blocker Door Stow-switch
AMM 78-31-18-000-040
Removal Blocker Door Stow-switch
AMM 78-31-18-400-001
Installation of the Blocker Door Stow-switch
AMM 78-31-18-400-040
Installation Blocker Door Stow-switch
AMM 78-31-19-210-040
Detailed Visual Inspection of the Blocker Door Latches, Hinges and Adjacent Structure (Blocker doors deployed)
AMM 78-31-41-000-001
Removal of the Blocker Door Hydraulic Actuator
AMM 78-31-41-000-040
Removal of the Blocker Door Hydraulic Actuators
AMM 78-31-41-210-003
Detailed Visual Inspection of the Door Actuator
AMM 78-31-41-210-040
Detailed Visual Inspection of the Blocker Door Actuator
AMM 78-31-41-400-001
Installation of the Blocker Door Hydraulic Actuator
AMM 78-31-41-400-040
Installation of the Blocker Door Hydraulic Actuators
AMM 78-31-51-000-040
Removal of the Hydraulic Control Unit
AMM 78-31-51-000-042
Removal of the Hydraulic Control Unit
AMM 78-31-51-210-040
Detailed Visual Inspection of the Hydraulic Control Unit
AMM 78-31-51-210-041
Check Hydraulic Control Unit Pop-Out Indicator Position
AMM 78-31-51-210-042
Check of the Indicator of Thrust-Reverser Hydraulic-Control-Unit Filter
AMM 78-31-51-400-040
Installation of the Hydraulic Control Unit
AMM 78-31-51-400-042
Installation of the Hydraulic Control Unit
AMM 78-32-41-000-001
Removal of the Lower Blocker Door
AMM 78-32-41-000-002
Removal of the Upper Blocker Door
AMM 78-32-41-000-003
Removal of the Latch Fitting and Latch Back Plate
AMM 78-32-41-000-040
Removal of the Lower Blocker Door
AMM 78-32-41-000-041
Removal of the Upper Blocker Door
AMM 78-32-41-000-042
Removal of the Latch Fitting and Latch Back Plate
AMM 78-32-41-200-040
Inspection/Check of the Latch Fitting Pin and Roller
AMM 78-32-41-200-041
Inspection/Check of the Latch Fitting Pin and Roller
AMM 78-32-41-210-003
Detailed Visual Inspection of the Blocker Door Seals
AMM 78-32-41-210-041
Detailed Visual Inspection of the Blocker Door Seals
AMM 78-32-41-400-001
Installation of the Lower Blocker Door
AMM 78-32-41-400-002
Installation of the Upper Blocker Door
AMM 78-32-41-400-003
Installation of the Latch Fitting and Latch Back Plate
AMM 78-32-41-400-040
Installation of the Lower Blocker Door
AMM 78-32-41-400-041
Installation of the Upper Blocker Door
AMM 78-32-41-400-042
Installation of the Latch Fitting and Latch Back Plate
AMM 78-32-41-820-001
Alignment of the Blocker Door
AMM 78-32-41-820-040
Alignment of the Blocker Door
AMM 78-32-41-860-001
Manual Deployment of the Blocker Door
AMM 78-32-41-860-002
Manual Stowing of the Blocker Door
AMM 78-32-41-860-040
Manual Deployment of the Blocker Door
AMM 78-32-41-860-041
Manual Stowing of the Blocker Door
3. Fault Confirmation
Subtask 78-31-00-710-176-A ** ON A/C NOT FOR ALL
WARNING: MAKE SURE THAT NO HYDRAULIC POWER IS AVAILABLE TO THE AIRCRAFT AND INHIBIT THE THRUST REVERSER ACTUATION SYSTEM WITH THE HCU INHIBITION LEVER. IF YOU DO NOT DO THIS, YOU CAN CAUSE INJURY TO YOURSELVES OR OTHER PERSONS.
CAUTION: IT IS IMPORTANT TO DO THIS TASK UNTIL THE END.
A. Test
NOTE: Do not try to operate the thrust reverser through a cycle before you start the trouble shooting steps below.
   (1) Make the thrust reverser unserviceable for maintenance AMM 78-30-00-481-041.
   (2) Do a visual check of the thrust reverser blocker doors to confirm that a blocker door is unlocked.
   (3) If you find that the doors are fully closed (flush with the Fan Cowl door), refer to AMM 78-32-41-820-040, do the step below.
   (4) With the Fan 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 autorestow function was activated. If this was the case, pay particular attention to the rigging of the blocker doors. AMM 78-32-41-820-040
     (a) If you could not isolate a defective door when you did the visual inspection do the fault isolation procedure steps 4.A., 4.B. or 4.C. as applicable.
Subtask 78-31-00-710-176-B ** ON A/C NOT FOR ALL
WARNING: MAKE SURE THAT NO HYDRAULIC POWER IS AVAILABLE TO THE AIRCRAFT AND INHIBIT THE THRUST REVERSER ACTUATION SYSTEM WITH THE HCU INHIBITION LEVER. IF YOU DO NOT DO THIS, YOU CAN CAUSE INJURY TO YOURSELVES OR OTHER PERSONS.
CAUTION: IT IS IMPORTANT TO DO THIS TASK UNTIL THE END.
A. Test
NOTE: Do not try to operate the thrust reverser through a cycle before you start the trouble shooting steps below.
   (1) Make the thrust reverser unserviceable for maintenance AMM 78-30-00-481-041.
   (2) Do a visual check of the thrust reverser blocker doors to confirm that a blocker door is unlocked.
   (3) If you find that the doors are fully closed (flush with the Fan Cowl door), AMM 78-32-41-820-001, do the step below.
   (4) With the Fan 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 autorestow function was activated. If this was the case, pay particular attention to the rigging of the blocker doors AMM 78-32-41-820-001.
     (a) If one blocker door or more is found unlocked or open, or fully locked with or without warning, do the fault isolation procedure steps 4.A., 4.B. or 4.C. as applicable.
4. Fault Isolation
Subtask 78-31-00-810-123-A ** ON A/C NOT FOR ALL
A. If only one of the blocker doors is found unlocked or open during the
   (1) Manually deploy the blocker door AMM 78-32-41-860-040.
     (a) If the door moves freely until it is in the fully open position, go to step (2) and continue.
     (b) If the door does not move freely:
       1 Disconnect the end of the actuator from the pivoting door AMM 78-31-41-000-040 and AMM 78-31-41-400-040.
       2 Move the actuator and check for friction points. If the actuator is defective replace the defective ACTUATOR-BLOCKER DOOR, UPPER R [3001KM1] and/or ACTUATOR-BLOCKER DOOR, LOWER R [3001KM2] and/or ACTUATOR-BLOCKER DOOR, LOWER L [3001KM3] and/or ACTUATOR-BLOCKER DOOR, UPPER L [3001KM4] as necessary AMM 78-31-41-000-040 and AMM 78-31-41-400-040.
       3 If you find no defect on the hydraulic actuator, do a check of the blocker door for freedom of movement. Replace a door if you cannot move it easily AMM 78-32-41-000-040, AMM 78-32-41-400-040, AMM 78-32-41-000-041 and AMM 78-32-41-400-041.
       4 Re-connect the end of the actuator AMM 78-31-41-400-040.
       5 Make sure that there is no unwanted object in the pivoting door area or kicker plate.
   (2) Check the blocker door latch fitting assembly.
     (a) Make sure there is no seizure of the roller and pin assembly. If the roller does not turn freely, repair or replace it AMM 78-32-41-200-040, AMM 78-32-41-000-042 and AMM 78-32-41-400-042..
     (b) Make sure that the bolts that attach the adjustable fitting on the door are tight and that the engagement of the serrated teeth is correct.
   (3) Check the blocker door actuator for leakage AMM 78-31-41-210-040. Replace if necessary.
   (4) Inspect the blocker door latch AMM 78-31-19-210-040. Replace if necessary.
   (5) Inspect the seals around the blocker door for deformation or disbonding AMM 78-32-41-210-041.
     (a) If the seals are deformed or disbonding replace the defective blocker door AMM 78-32-41-000-040, AMM 78-32-41-000-041, AMM 78-32-41-400-040 and AMM 78-32-41-400-041.
   (6) Make sure the blocker door latch is in the unlock position and manually stow the door AMM 78-32-41-860-041.
   (7) With the door fully stowed and locked, do a check of the blocker door alignment and correct it if necessary AMM 78-32-41-820-040.
   (8) Inspect HCU and filter indicator for popping out AMM 78-31-51-210-041 and AMM 78-31-51-210-040. Repair if necessary.
   (9) If no adjustment is performed or no part is replaced per step 4.A.(1)to 4.A.(8) replace the blocker door latch LATCH-BLOCKER DOOR, UPPER R [3002KM1] and/or LATCH-BLOCKER DOOR, LOWER R [3002KM2] and/or LATCH-BLOCKER DOOR, LOWER L [3002KM3] and/or LATCH-BLOCKER DOOR, UPPER L [3002KM4] and the HCU-THRUST REV (4101KS) as a precaution AMM 78-32-41-000-042, AMM 78-32-41-400-042, AMM 78-31-51-000-040 and AMM 78-31-51-400-040.
Subtask 78-31-00-810-131-B ** ON A/C NOT FOR ALL
B. If more than one blocker door has been found unlocked.
Subtask 78-31-00-810-125-A ** ON A/C NOT FOR ALL
C. If all the blocker doors are found completely locked (flush with fan cowl door) but the warning continues to show:
   (1) 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.
     (a) If there was previous maintenance action on the thrust reverser that caused the fault:
       1 Do an operational test of the thrust reverser AMM 78-31-00-710-040.
     (b) If there is no fault and the blocker doors are properly locked after the test:
       1 No further maintenance action is required.
   (2) If it cannot be confirmed that previous maintenance action was the cause, perform electrical check as follows:
     (a) Make the thrust reverser unserviceable for maintenance AMM 78-30-00-481-041.
     (b) Disconnect the thrust reverser harness from each stow switch and, with the doors stowed, do an electrical resistance check on the stow switches 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 defective stow switch: SW-BLOCKER DOOR STOW, UPPER R [4104KS1] or SW-BLOCKER DOOR STOW, LOWER R [4104KS2] or SW-BLOCKER DOOR STOW, LOWER L [4104KS3] or SW-BLOCKER DOOR STOW, UPPER L [4104KS4] AMM 78-31-18-000-040 and AMM 78-31-18-400-040.
   (3) Manually deploy the thrust reverser blocker doors AMM 78-32-41-860-040 and do an electrical resistance check on the stow switches 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:
       1 replace the defective stow SW-BLOCKER DOOR STOW, UPPER R [4104KS1] or SW-BLOCKER DOOR STOW, LOWER R [4104KS2] or SW-BLOCKER DOOR STOW, LOWER L [4104KS3] or SW-BLOCKER DOOR STOW, UPPER L [4104KS4] AMM 78-31-18-000-040 and AMM 78-31-18-400-040.
   (4) Reconnect the thrust reverser harness at each stow switch, manually stow all the blocker doors.
   (5) Disconnect the harness connector J5 and J6 from the ECU and do a resistance check on the harness connectors between:
.pins 23 and 24 (<5 ohms).
     (a) If there is an open circuit:
       1 replace or repair the harnesses J5 and J6 or the thrust reverser harness AMM 71-51-43-000-041 and AMM 71-51-43-400-041.
NOTE: The step (6) is to be accomplished at the same time as step (7).
   (6) Perform a visual check of the stow switches lever arm for wear. If abnormal wear is found on lever arm replace relevant stow switch(es) AMM 78-31-18-000-040 and AMM 78-31-18-400-040.
   (7) Perform a visual check of the blocker door latch fitting paddle(s) for wear. If wear is outside of AMM allowable limit (0.5 mm/0.02 in) replace the relevant latch fitting assembly(ies) AMM 78-32-41-000-042 and AMM 78-32-41-400-042.
   (8) Do a check of the blocker door alignment and correct it if necessary AMM 78-32-41-820-040.
   (9) If the fault continues:
   (10) If the fault continues:
Subtask 78-31-00-810-123-B ** ON A/C NOT FOR ALL
D. If only one of the blocker doors is found unlocked or open during the manual check:
   (1) Manually deploy the blocker door AMM 78-32-41-860-001.
     (a) If the door moves freely until it is in the fully open position, go to step (2) and continue.
     (b) If the door does not move freely:
       1 Disconnect the end of the actuator from the pivoting door AMM 78-31-41-000-001 and AMM 78-31-41-400-001.
       2 Move the actuator and check for friction points. If the actuator is defective replace the defective ACTUATOR-BLOCKER DOOR, UPPER R [3001KM1] and/or ACTUATOR-BLOCKER DOOR, LOWER R [3001KM2] and/or ACTUATOR-BLOCKER DOOR, LOWER L [3001KM3] and/or ACTUATOR-BLOCKER DOOR, UPPER L [3001KM4] as necessary AMM 78-31-41-000-001 and AMM 78-31-41-400-001.
       3 If you find no defect on the hydraulic actuator, do a check of the blocker door for freedom of movement. Replace a door if you cannot move it easily AMM 78-32-41-000-001, AMM 78-32-41-400-001, AMM 78-32-41-000-002 and AMM 78-32-41-400-002.
       4 Re-connect the end of the actuator AMM 78-31-41-400-001.
       5 Make sure that there is no unwanted object in the pivoting door area or kicker plate.
   (2) Check the blocker door latch fitting assembly.
     (a) Make sure there is no seizure of the roller and pin assembly. If the roller does not turn freely, repair or replace it AMM 78-32-41-200-041, AMM 78-32-41-000-003 and AMM 78-32-41-400-003.
     (b) Make sure that the bolts that attach the adjustable fitting on the door are tight and that the engagement of the serrated teeth is correct.
   (3) Check the blocker door actuator for leakage AMM 78-31-41-210-003. Replace if necessary.
   (4) Inspect the blocker door latch AMM 78-31-19-210-040. Replace if necessary.
   (5) Inspect the seals around the blocker door for deformation or disbonding AMM 78-32-41-210-003.
     (a) If the seals are deformed or disbonding replace the defective blocker door AMM 78-32-41-000-001, AMM 78-32-41-000-002, AMM 78-32-41-400-001 and AMM 78-32-41-400-002.
   (6) Make sure the blocker door latch is in the unlock position and manually stow the door AMM 78-32-41-860-002.
   (7) With the door fully stowed and locked, do a check of the blocker door alignment and correct it if necessary AMM 78-32-41-820-001.
   (8) Inspect HCU and filter indicator for popping out AMM 78-31-51-210-042 and AMM 78-31-51-210-040. Repair if necessary.
   (9) If no adjustment is performed or no part is replaced per step 4.A.(1)to 4.A.(8) replace the blocker door latch LATCH-BLOCKER DOOR, UPPER R [3002KM1] and/or LATCH-BLOCKER DOOR, LOWER R [3002KM2] and/or LATCH-BLOCKER DOOR, LOWER L [3002KM3] and/or LATCH-BLOCKER DOOR, UPPER L [3002KM4] and the HCU-THRUST REV (4101KS) as a precaution AMM 78-32-41-000-003 and AMM 78-32-41-400-003, AMM 78-31-51-000-042 and AMM 78-31-51-400-042.
Subtask 78-31-00-810-131-A ** ON A/C NOT FOR ALL
E. If more than one blocker door has been found unlocked or open:
   (1) Perform step 4.A.(1) to 4.A.(8)
     (a) If no part has been found faulty, replace the HCU-THRUST REV (4101KS) as a precaution.
Subtask 78-31-00-810-125-B ** ON A/C NOT FOR ALL
F. If all the blocker doors are found completely locked (flush with fan cowl door) but the warning continues to show:
   (1) 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.
     (a) If there was previous maintenance action on the thrust reverser that caused the fault:
       1 Do an operational test of the thrust reverser AMM 78-31-00-710-042.
     (b) If there is no fault and the blocker doors are properly locked after the test:
       1 No further maintenance action is required.
   (2) If it cannot be confirmed that previous maintenance action was the cause, perform electrical check as follows:
     (a) Make the thrust reverser unserviceable for maintenance AMM 78-30-00-481-041.
     (b) Disconnect the thrust reverser harness from each stow switch and, with the doors stowed, do an electrical resistance check on the stow switches 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 defective stow switch: SW-BLOCKER DOOR STOW, UPPER R [4104KS1] or SW-BLOCKER DOOR STOW, LOWER R [4104KS2] or SW-BLOCKER DOOR STOW, LOWER L [4104KS3] or SW-BLOCKER DOOR STOW, UPPER L [4104KS4] AMM 78-31-18-000-001 and AMM 78-31-18-400-001.
   (3) Manually deploy the thrust reverser blocker doors AMM 78-32-41-860-001 and do an electrical resistance check on the stow switches 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:
       1 replace the defective stow SW-BLOCKER DOOR STOW, UPPER R [4104KS1] or SW-BLOCKER DOOR STOW, LOWER R [4104KS2] or SW-BLOCKER DOOR STOW, LOWER L [4104KS3] or SW-BLOCKER DOOR STOW, UPPER L [4104KS4] AMM 78-31-18-000-001 and AMM 78-31-18-400-001.
   (4) Reconnect the thrust reverser harness at each stow switch, manually stow all the blocker doors.
   (5) Disconnect the harness connector J5 (4213KS) and J6 (4214KS) from the ECU and do a resistance check on the harness connectors between:
.pins 23 and 24 (<5 ohms).
     (a) If there is an open circuit:
       1 replace or repair the harnesses J5 HARNESS-ECU TO THRUST REVERSER JUNCTION BOX CHAN A [4213KS] and J6 HARNESS-ECU TO THRUST REVERSER JUNCTION BOX, CHAN B [4214KS] or the thrust reverser harness HARNESS-JUNCTION BOX TO THRUST REVERSER, CHAN A/B [4200KS] AMM 71-51-43-000-049 and AMM 71-51-43-400-049.
NOTE: The step (6) is to be accomplished at the same time as step (7).
   (6) Perform a visual check of the stow switches lever arm for wear. If abnormal wear is found on lever arm replace relevant stow switch(es) AMM 78-31-18-000-001 and AMM 78-31-18-400-001.
   (7) Perform a visual check of the blocker door latch fitting paddle(s) for wear. If wear is outside of AMM allowable limit (0.5 mm/0.02 in) replace the relevant latch fitting assembly(ies) AMM 78-32-41-000-003 and AMM 78-32-41-400-003.
   (8) Do a check of the blocker door alignment and correct it if necessary AMM 78-32-41-820-001.
   (9) If the fault continues:
   (10) If fault continues, replace the ECU-1 [4000KS1] and ECU-2 [4000KS2] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.
Subtask 78-31-00-810-282-A ** ON A/C NOT FOR ALL
G. If all doors are found completely locked and the warning is no longer shown:
   (1) Do steps 4.A.(1) to 4.A.(7) on each door.
Subtask 78-31-00-710-177-A ** ON A/C NOT FOR ALL
H. Make the thrust reverser serviceable AMM 78-30-00-081-041.
   (1) Perform the operational test of the thrust reverser AMM 78-31-00-710-040.
   (2) Complete the thrust Reverser Rev Unlock Field Investigation Worksheet.
Subtask 78-31-00-710-177-B ** ON A/C NOT FOR ALL
H. Make the thrust reverser serviceable AMM 78-30-00-081-041.
   (1) Perform the operational test of the thrust reverser AMM 78-31-00-710-042.
   (2) Complete the thrust Reverser Rev Unlock Field Investigation Worksheet.
[Rev.8 from Aug 2018] 2026.04.04 04:38:05 UTC