DOC AIRBUS | AMM A320FAlignment of the Blocker Door [CFMB]
TASK 78-32-41-820-001-A
Alignment of the Blocker Door
1. Reason for the Job
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 78-32-41-941-051-A ** ON A/C NOT FOR ALL
Subtask 78-32-41-220-050-A ** ON A/C NOT FOR ALL
Subtask 78-32-41-440-086-A ** ON A/C NOT FOR ALL Subtask 78-32-41-440-051-A ** ON A/C NOT FOR ALL Subtask 78-32-41-410-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:11:56 UTC
Alignment of the Blocker Door
1. Reason for the Job
NOTE: This task can contribute to fuel savings.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )  |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03ABA1) | lubricant |
| (Material No.08BBB1) | cleaner |
| (Material No.14SBA1) | lint-free cotton cloth |
| (Material No.14VGF1) | plasticine |
| (Material No.CP2245) | finish paint EA4 blue 5991 |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-440-040-B | Reactivation of Thrust Reverser |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-31-00-710-042-A | Operational Test of the Thrust Reverser System |
| TASK 78-31-41-400-001-A | Installation of the Blocker Door Hydraulic Actuator |
| TASK 78-32-41-860-001-A | Manual Deployment of the Blocker Door |
| TASK 78-32-41-860-002-A | Manual Stowing of the Blocker Door |
Blocker Doors AdjustmentSubtask 78-32-41-941-051-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 78-32-41-010-069-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 78-32-41-040-051-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).
4. ProcedureNOTE: Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040).
Subtask 78-32-41-220-050-A ** ON A/C NOT FOR ALL
A. Measure the mismatch space between the blocker door and the fan cowl.
(1) If the blocker door is in negative step, the mismatch space must be less than 0.118 in. (3.0 mm). If the measure is not in the permissible limits, go to step B.
(2) If the blocker door is in positive step, the mismatch space must be less than 0.047 in. (1.2 mm). If the measure is not in the permissible limits, go to step B.
(3) If the mismatch space is correct go to step C.
Subtask 78-32-41-820-050-A ** ON A/C NOT FOR ALL (1) If the blocker door is in negative step, the mismatch space must be less than 0.118 in. (3.0 mm). If the measure is not in the permissible limits, go to step B.
(2) If the blocker door is in positive step, the mismatch space must be less than 0.047 in. (1.2 mm). If the measure is not in the permissible limits, go to step B.
(3) If the mismatch space is correct go to step C.
B. Adjust the latch fittings on the blocker doors
(2) Manually move the blocker door to the open position (Ref. AMM TASK 78-32-41-860-001) .
(3) Loosen four bolts that attach the latch fitting to the thrust reverser frame.
(4) If the blocker door is in positive step, pull up the latch fitting the needed number of teeth to remove the mismatch. One tooth corresponds to 0.75 mm (0.03 in.).
(5) If the blocker door is in negative step, push down the latch fitting the needed number of teeth to remove the mismatch.
(6) TORQUE the bolts to between 80 and 70 lbf.in (0.90 and 0.79 m.daN ).
(7) Close the blocker door:
(8) Close the fan cowl door (Ref. AMM TASK 71-13-00-410-040).
(9) Do step 4.A. again.
Subtask 78-32-41-820-064-A ** ON A/C NOT FOR ALL NOTE: Apply a witness line of finish paint EA4 blue 5991 (Material No.CP2245) on all nuts and connections when you have done the check of their torques.
(1) Open the fan cowl door (Ref. AMM TASK 71-13-00-010-040). (2) Manually move the blocker door to the open position (Ref. AMM TASK 78-32-41-860-001) .
(3) Loosen four bolts that attach the latch fitting to the thrust reverser frame.
(4) If the blocker door is in positive step, pull up the latch fitting the needed number of teeth to remove the mismatch. One tooth corresponds to 0.75 mm (0.03 in.).
(5) If the blocker door is in negative step, push down the latch fitting the needed number of teeth to remove the mismatch.
(6) TORQUE the bolts to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )
. (7) Close the blocker door:
CAUTION:
BLOCKER DOOR LATCH MUST BE OPENED WHEN YOU CLOSE THE BLOCKER DOOR OR DAMAGE CAN OCCUR.
(a) Manually move the blocker door to the closed position (Ref. AMM TASK 78-32-41-860-002). (8) Close the fan cowl door (Ref. AMM TASK 71-13-00-410-040).
(9) Do step 4.A. again.
C. Verify Primary Door Latch (PDL) Engagement
(1) Open the fan cowl door (Ref. AMM TASK 71-13-00-010-040).
(2) Manually bring the blocker door to deploy position (Ref. AMM TASK 78-32-41-860-001).
(3) Clean the PDL finger and the PDL casting with cleaner (Material No.08BBB1) , or equivalent, and wipe with a lint-free cotton cloth (Material No.14SBA1) .
(4) To prevent the plasticine (Material No.14VGF1) from sticking to the PDL finger, apply a coating of lubricant (Material No.03ABA1) , or equivalent, in the area where the plasticine (Material No.14VGF1) will make contact.
(5) With pivot door open and hydraulics disabled, place approx. 0.125 in. (3.175 mm) diameter sphere of plasticine (Material No.14VGF1) or equivalent clay, on the PDL casting.
(6) Manually bring the blocker door to stow position (Ref. AMM TASK 78-32-41-860-002).
(7) Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-440-040).
(8) Cycle the thrust reverser one time (Ref. AMM TASK 78-31-00-710-042).
(9) Make the thrust reverser unserviceable again (Ref. AMM TASK 78-30-00-481-041).
(10) Manually bring the blocker door to deploy position again (Ref. AMM TASK 78-32-41-860-001).
(11) Measure the minimum plasticine (Material No.14VGF1) thickness. Record the door position and the remaining thickness of the plasticine (Material No.14VGF1) .
(a) Make sure all plasticine (Material No.14VGF1) is removed from PDL and surrounding area.
(12) Carry out the following based on your findings:
(a) If the thickness is between 0.000 in. (0 mm) and 0.010 in. (0.254 mm), go to step 5.
(b) If the thickness is greater than 0.010 in. (0.2540 mm): Pull the latch fitting inwards - toward the engine the number of teeth until thickness is less than 0.010 in. (0.2540 mm). Then do step 4. B again to re-check the door exterior surface alignment.
(c) If the full PDL travel (with hydraulic retract pressure applied) and external door fairness limits (with hydraulics off) cannot be met, replace pivot door actuator (Ref. AMM TASK 78-31-41-400-001).
5. Close-up(1) Open the fan cowl door (Ref. AMM TASK 71-13-00-010-040).
(2) Manually bring the blocker door to deploy position (Ref. AMM TASK 78-32-41-860-001).
(3) Clean the PDL finger and the PDL casting with cleaner (Material No.08BBB1) , or equivalent, and wipe with a lint-free cotton cloth (Material No.14SBA1) .
(4) To prevent the plasticine (Material No.14VGF1) from sticking to the PDL finger, apply a coating of lubricant (Material No.03ABA1) , or equivalent, in the area where the plasticine (Material No.14VGF1) will make contact.
(5) With pivot door open and hydraulics disabled, place approx. 0.125 in. (3.175 mm) diameter sphere of plasticine (Material No.14VGF1) or equivalent clay, on the PDL casting.
(6) Manually bring the blocker door to stow position (Ref. AMM TASK 78-32-41-860-002).
(7) Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-440-040).
(8) Cycle the thrust reverser one time (Ref. AMM TASK 78-31-00-710-042).
(9) Make the thrust reverser unserviceable again (Ref. AMM TASK 78-30-00-481-041).
(10) Manually bring the blocker door to deploy position again (Ref. AMM TASK 78-32-41-860-001).
(11) Measure the minimum plasticine (Material No.14VGF1) thickness. Record the door position and the remaining thickness of the plasticine (Material No.14VGF1) .
(a) Make sure all plasticine (Material No.14VGF1) is removed from PDL and surrounding area.
(12) Carry out the following based on your findings:
(a) If the thickness is between 0.000 in. (0 mm) and 0.010 in. (0.254 mm), go to step 5.
(b) If the thickness is greater than 0.010 in. (0.2540 mm): Pull the latch fitting inwards - toward the engine the number of teeth until thickness is less than 0.010 in. (0.2540 mm). Then do step 4. B again to re-check the door exterior surface alignment.
(c) If the full PDL travel (with hydraulic retract pressure applied) and external door fairness limits (with hydraulics off) cannot be met, replace pivot door actuator (Ref. AMM TASK 78-31-41-400-001).
Subtask 78-32-41-440-086-A ** ON A/C NOT FOR ALL Subtask 78-32-41-440-051-A ** ON A/C NOT FOR ALL Subtask 78-32-41-410-051-A ** ON A/C NOT FOR ALL
C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl door (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl door (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).