DOC AIRBUS | AMM A320FInstallation of the Upper Blocker Door [CFMI]
TASK 78-32-41-400-041-A
Installation of the Upper Blocker Door
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 78-32-41-860-063-A ** ON A/C NOT FOR ALL
Subtask 78-32-41-420-056-A ** ON A/C NOT FOR ALL
Subtask 78-32-41-440-063-A ** ON A/C NOT FOR ALL Subtask 78-32-41-410-067-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:38:09 UTC
Installation of the Upper Blocker Door
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. 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 45 and 35 lbf.in (0.51 and 0.40 m.daN )  | |
| No specific | Torque wrench: range to between 80 and 70 lbf.in (0.90 and 0.79 m.daN ) | |
| No specific | Torque wrench: range to between 797 and 531 lbf.in (9.01 and 6.00 m.daN ) | |
| No specific | Torque wrench: range to between 1022.7 and 925.3 lbf.in (11.56 and 10.46 m.daN ) | |
| HIX1003 | 1 | HANDLING BRACKET-PIVOTING DOOR |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2104) | molykote G rapid |
| (Material No.CP2245) | finish paint EA4 blue 5991 |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 10 | COTTER PIN | AIPC 78-32-41-01-020 |
| 20 | COTTER PIN | AIPC 78-32-41-01-020 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-040-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-A | Closing of the Fan Cowl Doors |
| TASK 78-30-00-081-041-A | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-A | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-31-00-710-040-A-01 | Operational Test of the Thrust Reverser without CFDS - Engine not Running |
| TASK 78-31-00-710-040-A-02 | Operational Test of the Thrust Reverser without CFDS - Engine Running |
| TASK 78-31-00-710-040-A | Operational Test of the Thrust Reverser System |
| TASK 78-31-00-710-040-A-01 | Operational Test of the Thrust Reverser without CFDS - Engine not Running |
| TASK 78-31-00-710-040-A-02 | Operational Test of the Thrust Reverser without CFDS - Engine Running |
| TASK 78-32-41-820-040-A | Alignment of the Blocker Door |
| TASK 78-32-41-860-041-A | Manual Stowing of the Blocker Door |
Upper Blocker DoorSubtask 78-32-41-860-063-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
Subtask 78-32-41-010-087-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
B. Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 78-32-41-040-081-A ** ON A/C NOT FOR ALL 4. Procedure(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 78-32-41-420-056-A ** ON A/C NOT FOR ALL
A. Installation of the Upper Blocker Door
(a) Install the handling sling at the actuator clevis previous location.
(b) Screw the knurled knob to attach the sling.
(3) Put the blocker door in deployed position with a crane.
(4) Install the two pivot bolts, washers and put the castellated nuts on the thread.
(5) Measure the two braking torques (A) of the two nuts.
(6) TORQUE each nut to between 1022.7 and 925.3 lbf.in (11.56 and 10.46 m.daN ) +torque A.
(7) Unscrew the nuts.
(8) Measure again the two braking torques (B).
(9) TORQUE each nut to between 797 and 531 lbf.in (9.01 and 6.00 m.daN ) + torque B.
(10) Attach with new AIPC 78-32-41-01-020 COTTER PIN (10) and AIPC 78-32-41-01-020 COTTER PIN (20).
(11) Apply a thin layer molykote G rapid (Material No.CP2104) on the contact finger.
(12) Install the contact finger and the bolts.
(13) TORQUE the bolts to between 45 and 35 lbf.in (0.51 and 0.40 m.daN ).
(14) Install the two pivot access doors on the blocker door and attach with screws.
(15) TORQUE screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN ).
(16) Install the hinge access panel and attach with screws.
(17) TORQUE the screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN ).
(18) Remove the HIX1003 HANDLING BRACKET-PIVOTING DOOR:
(a) Unscrew the knurled knob.
(b) Remove the blocker door handling sling.
(19) Install the hydraulic actuator clevis on the blocker door:
(a) Install the clevis on the blocker door.
(b) Install the four washers and bolts.
(c) TORQUE the bolts to between 80 and 70 lbf.in (0.90 and 0.79 m.daN ).
(20) Install the clevis access door on the blocker door.
(a) Install the access door on the upper blocker door.
(b) Install the eight screws.
(c) TORQUE the screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN ).
(21) Install the deploy-switch access door:
(a) Install the access door.
(b) Install the eight screws.
(c) TORQUE the screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN ).
(22) Stow the blocker door:
(23) Do a check of the alignment of the blocker door (Ref. AMM TASK 78-32-41-820-040).
(a) Make sure that the lockout bolt hole in the blocker door is aligned with the fitting hole.
5. Close-upCAUTION:
DO NOT PUSH ON THE STOW SWITCH LEVER WHEN BLOCKER DOOR IS OPENED OR DAMAGE COULD OCCUR.
(1) Install the HIX1003 HANDLING BRACKET-PIVOTING DOOR: (a) Install the handling sling at the actuator clevis previous location.
(b) Screw the knurled knob to attach the sling.
NOTE: You should apply a witness line of finish paint EA4 blue 5991 (Material No.CP2245) on all nuts and connections when you have checked their torques.
(2) Apply a thin layer of molykote G rapid (Material No.CP2104) on the pivot bolts. (3) Put the blocker door in deployed position with a crane.
(4) Install the two pivot bolts, washers and put the castellated nuts on the thread.
(5) Measure the two braking torques (A) of the two nuts.
(6) TORQUE each nut to between 1022.7 and 925.3 lbf.in (11.56 and 10.46 m.daN )
+torque A. (7) Unscrew the nuts.
(8) Measure again the two braking torques (B).
(9) TORQUE each nut to between 797 and 531 lbf.in (9.01 and 6.00 m.daN )
+ torque B. (10) Attach with new AIPC 78-32-41-01-020 COTTER PIN (10) and AIPC 78-32-41-01-020 COTTER PIN (20).
(11) Apply a thin layer molykote G rapid (Material No.CP2104) on the contact finger.
(12) Install the contact finger and the bolts.
(13) TORQUE the bolts to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )
. (14) Install the two pivot access doors on the blocker door and attach with screws.
(15) TORQUE screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )
. (16) Install the hinge access panel and attach with screws.
(17) TORQUE the screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )
. (18) Remove the HIX1003 HANDLING BRACKET-PIVOTING DOOR:
(a) Unscrew the knurled knob.
(b) Remove the blocker door handling sling.
(19) Install the hydraulic actuator clevis on the blocker door:
(a) Install the clevis on the blocker door.
(b) Install the four washers and bolts.
(c) TORQUE the bolts to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )
. (20) Install the clevis access door on the blocker door.
(a) Install the access door on the upper blocker door.
(b) Install the eight screws.
(c) TORQUE the screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )
. (21) Install the deploy-switch access door:
(a) Install the access door.
(b) Install the eight screws.
(c) TORQUE the screws to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )
. (22) Stow the blocker door:
CAUTION:
BLOCKER DOOR LATCH MUST BE OPENED WHEN YOU CLOSE THE BLOCKER DOOR OR DAMAGE CAN OCCUR.
(a) Manually bring blocker doors to stow position (Ref. AMM TASK 78-32-41-860-041). (23) Do a check of the alignment of the blocker door (Ref. AMM TASK 78-32-41-820-040).
(a) Make sure that the lockout bolt hole in the blocker door is aligned with the fitting hole.
Subtask 78-32-41-440-063-A ** ON A/C NOT FOR ALL Subtask 78-32-41-410-067-A ** ON A/C NOT FOR ALL
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls doors (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).
Subtask 78-32-41-710-055-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls doors (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).
C. Do an operational test:
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-040).
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-040).
NOTE: As an alternative procedure you can do this operational test without the CFDS:
- first method with engine not running (Ref. AMM TASK 78-31-00-710-040)
- second method with engine running (Ref. AMM TASK 78-31-00-710-040).