DOC AIRBUS | AMM A320FAdjustment of the Thrust Reverser Cowl Doors Clearance [CFML]
TASK 78-32-11-820-801-A
Adjustment of the Thrust Reverser Cowl Doors Clearance
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 78-32-11-941-063-A
Subtask 78-32-11-020-056-A
Subtask 78-32-11-410-074-A
[Rev.10 from 2021]
2026.04.01 12:58:02 UTC
Adjustment of the Thrust Reverser Cowl Doors Clearance
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CPNCL00653) | LUBRICANT (MOLYKOTE G-RAPID PLUS PASTE) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR, 462AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 6 | PEELABLE SHIM | AIPC 78-30-24-10-310 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-803-A | Closing of the Fan Cowl Doors |
| TASK 78-30-00-040-807-A | Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) |
| TASK 78-30-00-440-807-A | Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU) |
| TASK 78-36-00-010-806-A | Opening of the Thrust Reverser Cowl Doors |
| TASK 78-36-00-410-806-A | Closing of the Thrust Reverser Cowl Doors |
| TASK 78-36-41-820-802-A | Adjustment of the Thrust Reverser Cowl Latch Tension |
Adjustment of the Thrust Reverser Cowl Doors ClearanceSubtask 78-32-11-941-063-A
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 78-32-11-010-079-A (1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
- The ENG/MODE selector switch, and
- The ENG/MASTER 1(2) control switch.
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR.
Subtask 78-32-11-040-066-A (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR.
C. Deactivation of the Thrust Reverser System for Maintenance
Subtask 78-32-11-010-080-A WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807). D. Open the right thrust reverser cowl-door (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR
(3) Put a INSPECTION CREEPER in position.
4. Procedure(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR
(3) Put a INSPECTION CREEPER in position.
Subtask 78-32-11-020-056-A
A. Removal of the Latch Bumper and Spigot
(1) Remove the latch-L1 bumper (5):
(a) Remove the latch-L1 bumper (5) with the peelable shim (6).
(b) Discard the peelable shim (6).
(2) Remove the latch-L1 spigot (9):
(a) Remove the screw (1) that attaches the plate (2) to the fire shield (4).
(b) Rotate the plate (2) around the rivet (3).
(c) Remove the nut (7) and washer (21) with the storage calibrated shims (8).
(a) Remove the screws (11).
(b) Remove the fire shield (12).
(c) Remove the screw (13) and the latch-L2 bumper (14) with the calibrated shims (15).
Subtask 78-32-11-820-056-A (1) Remove the latch-L1 bumper (5):
(a) Remove the latch-L1 bumper (5) with the peelable shim (6).
(b) Discard the peelable shim (6).
(2) Remove the latch-L1 spigot (9):
(a) Remove the screw (1) that attaches the plate (2) to the fire shield (4).
(b) Rotate the plate (2) around the rivet (3).
(c) Remove the nut (7) and washer (21) with the storage calibrated shims (8).
NOTE: Do not discard the storage calibrated shims (8).
(d) Remove the latch-L1 spigot (9) with the calibrated shims (8).NOTE: The calibrated shim (8) can be re-used.
(3) Remove the latch-L2 bumper (14) and the latch-L2 spigot (20):(a) Remove the screws (11).
(b) Remove the fire shield (12).
(c) Remove the screw (13) and the latch-L2 bumper (14) with the calibrated shims (15).
NOTE: The calibrated shims (15) can be re-used.
(d) Remove the nut (16) and washer (17) with the storage calibrated shims (15). NOTE: Do not discard the storage calibrated shims (15).
(e) Remove the nut (18) and washer (21) with the storage calibrated shims (19). NOTE: Do not discard the storage calibrated shims (19).
(f) Remove the latch-L2 spigot (20) with the calibrated shims (19). NOTE: The calibrated shims (19) can be re-used.
B. Adjustment of the Thrust Reverser Cowl Door Clearance
(1) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806).
(2) Adjust the tension of latch-LACC.1 and latch-LACC.2 (Ref. AMM TASK 78-36-41-820-802).
(3) Adjust the tension of latch-L4.1 and latch-L4.2 (Ref. AMM TASK 78-36-41-820-802).
(4) Adjust the tension of latch-L3.1 and latch-L3.2 (Ref. AMM TASK 78-36-41-820-802).
(5) Adjust the tension of latch-L2 (Ref. AMM TASK 78-36-41-820-802).
(7) Installation of clay on the fitting area:
(a) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806).
(b) Install some clay on the latch-L1 and latch-L2 fitting area.
(c) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806).
(d) Make sure that the spigots or bumpers are in contact with the opposite bushes or pads on L3.1 and L3.2, L4.1 and L4.2, LACC.1 and LACC.2.
(8) Measure and record the remaining thickness "J" of the clay for each latch-L1 and latch-L2 area.
Subtask 78-32-11-420-056-A (1) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806).
(2) Adjust the tension of latch-LACC.1 and latch-LACC.2 (Ref. AMM TASK 78-36-41-820-802).
(3) Adjust the tension of latch-L4.1 and latch-L4.2 (Ref. AMM TASK 78-36-41-820-802).
(4) Adjust the tension of latch-L3.1 and latch-L3.2 (Ref. AMM TASK 78-36-41-820-802).
(5) Adjust the tension of latch-L2 (Ref. AMM TASK 78-36-41-820-802).
NOTE: The force necessary to adjust the tension of the latches must be between 5.5 daN (12.36 lbf) and 7.5 daN (16.86 lbf).
NOTE: These tension values are applicable for this step only.
(6) Adjust the tension of latch-L1 (Ref. AMM TASK 78-36-41-820-802). (7) Installation of clay on the fitting area:
(a) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806).
(b) Install some clay on the latch-L1 and latch-L2 fitting area.
(c) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806).
(d) Make sure that the spigots or bumpers are in contact with the opposite bushes or pads on L3.1 and L3.2, L4.1 and L4.2, LACC.1 and LACC.2.
NOTE: If you find gaps between the spigots or bumpers with the opposite bushes or pads on latch-L3.1 and latch-L3.2, latch-L4.1 and latch-L4.2 and latch-LACC.1 and latch-LACC.2, repeat Para. 4.B.(1) thru Para. 4.B.(7)(c).
(e) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806). (8) Measure and record the remaining thickness "J" of the clay for each latch-L1 and latch-L2 area.
NOTE: The thickness "J" is the distance between the left thrust reverser 6 o'clock beam and the right thrust reverser bushing or bumper.
(9) Make sure that the thickness of clay "J" is between: - For the latch-L1 bumper side: 5 mm (0.20 in.) and 9 mm (0.35 in.)
- For the latch-L1 spigot side: 5 mm (0.20 in.) and 9 mm (0.35 in.)
- For the latch-L2 bumper side: 5 mm (0.20 in.) and 9 mm (0.35 in.)
- For the latch-L2 spigot side: 5 mm (0.20 in.) and 9 mm (0.35 in.).
NOTE: If "J" is not between these values, contact SAFRAN Nacelles.
C. Installation of the Latch Bumper and Spigot
(1) Installation of the latch-L1 spigot (9) and the latch-L1 bumper (5):
(a) Install the latch-L1 spigot (9):
1 Calculate the calibrated shims thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
CPNCL00653 LUBRICANT (MOLYKOTE G-RAPID PLUS PASTE)
4 Install the latch-L1 spigot (9) with the arranged calibrated shims (8).
5 Install the storage calibrated shims (8), washer (21) and the nut (7).
6 Tighten the latch-L1 spigot (9).
7 TORQUE the latch-L1 spigot (9) to between 0.735 and 0.665 m.daN (65.04 and 58.85 lbf.in )
.
8 Rotate the plate (2) around the rivet (3).
9 Install the screw (1) to attach the plate (2) to the fire shield (4).
(b) Install the latch-L1 bumper (5):
1 Calculate the new AIPC 78-30-24-10-310 PEELABLE SHIM (6)thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
CPNCL00653 LUBRICANT (MOLYKOTE G-RAPID PLUS PASTE)
4 Install the latch-L1 bumper (5) with the adjusted AIPC 78-30-24-10-310 PEELABLE SHIM (6)
5 Tighten the latch-L1 bumper (5).
6 TORQUE the latch-L1 bumper (5) to between 0.367 and 0.332 m.daN (32.48 and 29.38 lbf.in ).
(2) Installation of the latch-L2 spigot (20) and latch-L2 bumper (14):
(a) Install the latch-L2 spigot (20):
1 Calculate the calibrated shims thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
CPNCL00653 LUBRICANT (MOLYKOTE G-RAPID PLUS PASTE)
4 Install the latch-L2 spigot (20) with the arranged calibrated shims (19).
5 Install the storage calibrated shims (19), washer (21) and the nut (18).
6 Tighten the latch-L2 spigot (20).
7 TORQUE the latch-L2 spigot (20) to between 0.735 and 0.665 m.daN (65.04 and 58.85 lbf.in ).
(b) Install the latch-L2 bumper (14):
1 Calculate the new calibrated shims thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
CPNCL00653 LUBRICANT (MOLYKOTE G-RAPID PLUS PASTE)
4 Install the latch-L2 bumper (14) with the calibrated shims (15) and the screw (13).
5 Install the storage calibrated shims (15), washer (17) and the nut (16).
6 Tighten the latch-L2 bumper (14).
7 TORQUE the screw (13) to between 0.367 and 0.332 m.daN (32.48 and 29.38 lbf.in ).
8 Install the fire shield (12).
9 Install the screws (11) on the fire shield (12).
5. Close-up(1) Installation of the latch-L1 spigot (9) and the latch-L1 bumper (5):
(a) Install the latch-L1 spigot (9):
1 Calculate the calibrated shims thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
NOTE: For this location E = J-A.
2 Prepare the calibrated shims related to the calculated thickness "E". NOTE: Use the table to calculate the calibrated shims related to the calculated value "E".
3 Apply 4 Install the latch-L1 spigot (9) with the arranged calibrated shims (8).
5 Install the storage calibrated shims (8), washer (21) and the nut (7).
6 Tighten the latch-L1 spigot (9).
7 TORQUE the latch-L1 spigot (9) to between 0.735 and 0.665 m.daN (65.04 and 58.85 lbf.in )
. 8 Rotate the plate (2) around the rivet (3).
9 Install the screw (1) to attach the plate (2) to the fire shield (4).
(b) Install the latch-L1 bumper (5):
1 Calculate the new AIPC 78-30-24-10-310 PEELABLE SHIM (6)thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
NOTE: For this location E = J-A.
2 Adjust the thickness of the newAIPC 78-30-24-10-310 PEELABLE SHIM (6) for bumper side. NOTE: The shim thickness must be less than 5 mm (0.20 in.) for the latch-L1 bumper (5) side.
3 Apply 4 Install the latch-L1 bumper (5) with the adjusted AIPC 78-30-24-10-310 PEELABLE SHIM (6)
5 Tighten the latch-L1 bumper (5).
6 TORQUE the latch-L1 bumper (5) to between 0.367 and 0.332 m.daN (32.48 and 29.38 lbf.in )
. (2) Installation of the latch-L2 spigot (20) and latch-L2 bumper (14):
(a) Install the latch-L2 spigot (20):
1 Calculate the calibrated shims thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
NOTE: For this location E = J-A.
2 Prepare the calibrated shims related to the calculated thickness "E". NOTE: Use the table to calculate the calibrated shims related to the calculated value "E".
3 Apply 4 Install the latch-L2 spigot (20) with the arranged calibrated shims (19).
5 Install the storage calibrated shims (19), washer (21) and the nut (18).
6 Tighten the latch-L2 spigot (20).
7 TORQUE the latch-L2 spigot (20) to between 0.735 and 0.665 m.daN (65.04 and 58.85 lbf.in )
. (b) Install the latch-L2 bumper (14):
1 Calculate the new calibrated shims thickness necessary "E" by removing the thickness of the spigot "A" from the measured value "J".
NOTE: For this location E = J-A.
2 Prepare the calibrated shims related to the calculated thickness "E". NOTE: Use the table to calculate the calibrated shims related to the calculated value "E".
3 Apply 4 Install the latch-L2 bumper (14) with the calibrated shims (15) and the screw (13).
5 Install the storage calibrated shims (15), washer (17) and the nut (16).
6 Tighten the latch-L2 bumper (14).
7 TORQUE the screw (13) to between 0.367 and 0.332 m.daN (32.48 and 29.38 lbf.in )
. 8 Install the fire shield (12).
9 Install the screws (11) on the fire shield (12).
Subtask 78-32-11-410-074-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR
Subtask 78-32-11-820-057-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR
B. Adjustment of the Thrust Reverser Cowl Latch Tension
(1) Adjust the tension of the thrust reverser latches (Ref. AMM TASK 78-36-41-820-802).
(2) Make sure that all spigots or bumpers are in contact with opposite bushes or pads on all the latches.
Subtask 78-32-11-440-059-A (1) Adjust the tension of the thrust reverser latches (Ref. AMM TASK 78-36-41-820-802).
(2) Make sure that all spigots or bumpers are in contact with opposite bushes or pads on all the latches.
NOTE: Do this procedure again if you find gaps between the spigots or bumpers and the bushes or pads.
NOTE: The contacts with the opposite structure around the latch-L4.1 and latch-L4.2 (on transcowl) are not between the spigots and the opposite bushes but between the latch-L4.1 and L4.2 pads.
C. Do the reactivation of the thrust-reverser after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).
Subtask 78-32-11-410-075-A