DOC AIRBUS | AMM A320FRemoval of the Sync Tubes, Sync Shafts, Flex Tubes and Flex Shaft [CFML]
TASK 78-31-44-000-802-A
Removal of the Sync Tubes, Sync Shafts, Flex Tubes and Flex Shaft
A. This removal task includes three primary subtasks:
- Removal of the right sync tube and sync shaft
- Removal of the over-the-top flex tube and flex shaft
- Removal of the left sync tube and sync shaft.
You can do one of these three subtasks and not the other two.
B. A sync shaft connects the right upper actuator with the right lower actuator. A flex shaft connects the two upper actuators. A sync shaft connects the left upper actuator with the left lower actuator. Each shaft is installed in a tube.
C. If you replace one of these three components (or an actuator), you must do a special adjustment procedure to synchronize the four actuators (Ref. AMM TASK 78-31-41-820-801).
D. The two upper actuators are also known as the Synchronized Locking Feedback Actuators (SLFAs). The right lower actuator is also known as the Synchronized Manual Locking Actuator (SMLA). The left lower actuator is also known as the Synchronized Non-Locking Actuator (SNLA).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 78-31-44-941-054-A
Subtask 78-31-44-020-052-A
[Rev.10 from 2021]
2026.04.01 03:35:16 UTC
Removal of the Sync Tubes, Sync Shafts, Flex Tubes and Flex Shaft
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.
1. Reason for the JobA. This removal task includes three primary subtasks:
- Removal of the right sync tube and sync shaft
- Removal of the over-the-top flex tube and flex shaft
- Removal of the left sync tube and sync shaft.
You can do one of these three subtasks and not the other two.
B. A sync shaft connects the right upper actuator with the right lower actuator. A flex shaft connects the two upper actuators. A sync shaft connects the left upper actuator with the left lower actuator. Each shaft is installed in a tube.
C. If you replace one of these three components (or an actuator), you must do a special adjustment procedure to synchronize the four actuators (Ref. AMM TASK 78-31-41-820-801).
D. The two upper actuators are also known as the Synchronized Locking Feedback Actuators (SLFAs). The right lower actuator is also known as the Synchronized Manual Locking Actuator (SMLA). The left lower actuator is also known as the Synchronized Non-Locking Actuator (SNLA).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | CAP - PROTECTION |
| No specific | AR | COVER - PROTECTION |
| No specific | AR | WARNING NOTICE(S) |
| 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 | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| TASK 70-70-00-910-804-A | Electrical Standard Practices |
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 78-30-00-040-807-A | Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) |
| TASK 78-31-49-680-801-A | Draining of the Thrust Reverser Hydraulic Tubes |
| TASK 78-32-50-010-801-A | Manually Deploy the Translating Cowl |
Right Sync Tube and ShaftSubtask 78-31-44-941-054-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 78-31-44-010-050-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
- 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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 78-31-44-040-052-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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
C. Deactivation of the Thrust Reverser System for Maintenance
Subtask 78-31-44-010-052-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. Get Access
(1) Depressurize the applicable hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(2) Drain the thrust reverser hydraulic tubes (Ref. AMM TASK 78-31-49-680-801).
(3) Manually deploy the translating cowl (Ref. AMM TASK 78-32-50-010-801).
4. Procedure(1) Depressurize the applicable hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(2) Drain the thrust reverser hydraulic tubes (Ref. AMM TASK 78-31-49-680-801).
(3) Manually deploy the translating cowl (Ref. AMM TASK 78-32-50-010-801).
Subtask 78-31-44-020-052-A
A. Removal of the Sync Tubes, Sync Shafts, Flex Tubes and Flex Shaft
(1) Removal of the right sync tube and sync shaft connectors
(a) Disconnect the coupling nut on the sync tube (3) from the right lower actuator (SMLA) (5).
(b) Remove the eight bolts (11) that attach the four saddle clamps (12) to the four support brackets (13).
(c) Remove the bolt (10) that attach the P-clamp (9) to the support bracket (8).
(d) Disconnect the tube coupling on the sync tube (3) from the right upper actuator (SLFA) (1).
(e) Pull down the trombone fitting (4).
(f) Disengagement of the sync shaft
2 Disengage the sync shaft (2) from the right lower actuator (SMLA) (5).
(g) Remove the sync tube (3) together with the sync shaft (2) from the thrust reverser. Do not let the sync shaft fall out of the sync tube during the removal.
(h) Make a record of the locations and positions of the P-clamps (9) and (12) on the sync tube (3) to make the installation easier.
(i) Remove the P-clamps (9) and (12) from the sync tube (3).
(j) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.
(2) Removal of the over-the-top flex tube and flex shaft connectors
(a) On the right side of the engine, remove the two bolts (40) and the saddle clamp (41) from the right bracket (42).
(b) Remove the two bolts (29) and the saddle clamp (31) from the support bracket (30).
(c) Disconnect the coupling nut on the flex tube (21) from the right upper actuator (SLFA) (1).
(d) Disengage the flex shaft (22) from the right upper actuator (SLFA) (1).
(e) Move the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE to the left side of the thrust reverser.
(f) Remove the two bolts (39) and the saddle clamp (38) from the left bracket (37).
(g) Remove the two bolts (32) and the saddle clamp (33) from the support bracket (34).
(h) Disconnect the two electrical harnesses (23) from the proximity sensors (24) on the left upper actuator (SLFA) (25) (Ref. AMM TASK 70-70-00-910-804).
(i) Manually move the ends of the electrical harnesses away from the removal path of the flex tube (21).
(j) Disconnect the coupling nut on the flex tube (21) from the T-fitting (26) on the left upper actuator (SLFA) (25).
(k) Disengage the flex shaft (22) from the T-fitting (26) on the left upper actuator (SLFA) (25).
(l) Remove the flex tube and flex shaft from the thrust reverser.
(m) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.
(3) Removal of the left sync tube and sync shaft connectors
(a) Disconnect the coupling nut on the sync tube (51) from the left lower actuator (SNLA) (54).
(b) Remove the two bolts (68) that attach the saddle clamp (69) to the support bracket (70).
(c) Remove the four bolts (67) that attach the two saddle clamps (66) to the support bracket (65) at two locations.
(d) Remove the two bolts (61) that attach the saddle clamp (62) to the support bracket (63).
(e) Remove the bolt (57) that attach the P-clamp (58) to the support bracket (59).
(f) Disconnect the coupling nut on the sync tube (51) from the left upper actuator (SLFA) (25).
(g) Pull down the trombone fitting (52).
(h) Disengagement of the sync shaft (53)
2 Disengage the sync shaft (53) from the left lower actuator (SNLA) (54).
(i) Remove the sync tube (51) together with the sync shaft (53) from the thrust reverser. Do not let the sync shaft fall out of the sync tube.
(j) Make a record of the location and position of the P-clamp (58) on the sync tube (51) to make the installation easier.
(k) Remove the P-clamp (58) from the sync tube (51).
(l) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.
(1) Removal of the right sync tube and sync shaft connectors
(a) Disconnect the coupling nut on the sync tube (3) from the right lower actuator (SMLA) (5).
(b) Remove the eight bolts (11) that attach the four saddle clamps (12) to the four support brackets (13).
(c) Remove the bolt (10) that attach the P-clamp (9) to the support bracket (8).
(d) Disconnect the tube coupling on the sync tube (3) from the right upper actuator (SLFA) (1).
(e) Pull down the trombone fitting (4).
(f) Disengagement of the sync shaft
CAUTION:
HOLD THE SYNC SHAFT IN THE SYNC TUBE. IF THE SYNC SHAFT FALLS OUT OF THE SYNC TUBE, DAMAGE TO THE SYNC SHAFT CAN OCCUR.
1 Disengage the sync shaft (2) from the right upper actuator (SLFA) (1). 2 Disengage the sync shaft (2) from the right lower actuator (SMLA) (5).
(g) Remove the sync tube (3) together with the sync shaft (2) from the thrust reverser. Do not let the sync shaft fall out of the sync tube during the removal.
(h) Make a record of the locations and positions of the P-clamps (9) and (12) on the sync tube (3) to make the installation easier.
(i) Remove the P-clamps (9) and (12) from the sync tube (3).
(j) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.
(2) Removal of the over-the-top flex tube and flex shaft connectors
(a) On the right side of the engine, remove the two bolts (40) and the saddle clamp (41) from the right bracket (42).
(b) Remove the two bolts (29) and the saddle clamp (31) from the support bracket (30).
(c) Disconnect the coupling nut on the flex tube (21) from the right upper actuator (SLFA) (1).
(d) Disengage the flex shaft (22) from the right upper actuator (SLFA) (1).
(e) Move the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE to the left side of the thrust reverser.
(f) Remove the two bolts (39) and the saddle clamp (38) from the left bracket (37).
(g) Remove the two bolts (32) and the saddle clamp (33) from the support bracket (34).
(h) Disconnect the two electrical harnesses (23) from the proximity sensors (24) on the left upper actuator (SLFA) (25) (Ref. AMM TASK 70-70-00-910-804).
(i) Manually move the ends of the electrical harnesses away from the removal path of the flex tube (21).
(j) Disconnect the coupling nut on the flex tube (21) from the T-fitting (26) on the left upper actuator (SLFA) (25).
(k) Disengage the flex shaft (22) from the T-fitting (26) on the left upper actuator (SLFA) (25).
(l) Remove the flex tube and flex shaft from the thrust reverser.
(m) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.
(3) Removal of the left sync tube and sync shaft connectors
(a) Disconnect the coupling nut on the sync tube (51) from the left lower actuator (SNLA) (54).
(b) Remove the two bolts (68) that attach the saddle clamp (69) to the support bracket (70).
(c) Remove the four bolts (67) that attach the two saddle clamps (66) to the support bracket (65) at two locations.
(d) Remove the two bolts (61) that attach the saddle clamp (62) to the support bracket (63).
(e) Remove the bolt (57) that attach the P-clamp (58) to the support bracket (59).
(f) Disconnect the coupling nut on the sync tube (51) from the left upper actuator (SLFA) (25).
(g) Pull down the trombone fitting (52).
(h) Disengagement of the sync shaft (53)
CAUTION:
HOLD THE SYNC SHAFT IN THE SYNC TUBE. IF THE SYNC SHAFT FALLS OUT OF THE SYNC TUBE, DAMAGE TO THE SYNC SHAFT CAN OCCUR.
1 Disengage the sync shaft (53) from the left upper actuator (SLFA) (25). 2 Disengage the sync shaft (53) from the left lower actuator (SNLA) (54).
(i) Remove the sync tube (51) together with the sync shaft (53) from the thrust reverser. Do not let the sync shaft fall out of the sync tube.
(j) Make a record of the location and position of the P-clamp (58) on the sync tube (51) to make the installation easier.
(k) Remove the P-clamp (58) from the sync tube (51).
(l) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.