DOC AIRBUS | AMM A320FRemoval of the Power Control Unit of the Slat System
TASK 27-84-51-000-001-A
Removal of the Power Control Unit of the Slat System
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 27-84-51-866-050-A
Subtask 27-84-51-020-050-A
[Rev.10 from 2021]
2026.03.31 23:57:38 UTC
Removal of the Power Control Unit of the Slat System
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING:
MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
FIN: 6001CM
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | CAP - BLANKING |
| No specific | 1 | CONTAINER - HYDRAULIC FLUID RESISTANT |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | 1 | WARNING NOTICE(S) |
| 98D27504030001 | 2 | LOCK-TORQUE SHAFT (FLAPS AND SLATS) WITH CLAMP-PIVOT |
| 98D27803000000 | 1 | LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 27-00-00-480-002-A | Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000) |
| TASK 27-50-00-400-003-A | Installation of the Lock-Torque Shaft - Flaps and Slats (98D27504030001) |
| TASK 27-80-00-860-801-A | Readout of the Slat Position Pickoff Unit (PPU) Data |
| TASK 27-80-00-866-005-A | Retracting the Slats on the Ground |
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
Power Control UnitSubtask 27-84-51-866-050-A
A. Retraction of the Slats
(1) Retract the slats to the 0 degree position (Ref. AMM TASK 27-80-00-866-005).
(2) Install the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION (Ref. AMM TASK 27-00-00-480-002) on the slat/flap control lever.
Subtask 27-84-51-740-050-A (1) Retract the slats to the 0 degree position (Ref. AMM TASK 27-80-00-866-005).
(2) Install the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION (Ref. AMM TASK 27-00-00-480-002) on the slat/flap control lever.
B. Readout of the PPU Data
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the readout of the PPU data (Ref. AMM TASK 27-80-00-860-801).
(Ref. AMM TASK 24-41-00-862-002).
Subtask 27-84-51-865-050-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the readout of the PPU data (Ref. AMM TASK 27-80-00-860-801).
NOTE: Airbus recommends to do the readout and recording of the PPU angles before the maintenance action.
In case of a loss of the torque shaft fixture you can put the slat transmission system back to the initial condition (without a complete adjustment of the system).
(3) De-energize the aircraft electrical circuitsIn case of a loss of the torque shaft fixture you can put the slat transmission system back to the initial condition (without a complete adjustment of the system).
(Ref. AMM TASK 24-41-00-862-002).
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 27-84-51-010-050-A Subtask 27-84-51-860-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1 | 5CV | B06 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1 | 5CV | B01 |
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/SLT/CTL/SYS2 | 7CV | R21 |
E. Aircraft Maintenance Configuration
(1) Make sure that the Green and the Blue hydraulic systems are depressurized and put them in the maintenance configuration. (Ref. AMM TASK 29-00-00-864-001).
(2) Depressurize the reservoirs of the Green and the Blue hydraulic systems (Ref. AMM TASK 29-14-00-614-001).
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems.
(4) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the main gear main door opening.
(5) Install the 98D27504030001 LOCK-TORQUE SHAFT (FLAPS AND SLATS) WITH CLAMP-PIVOT to lock the left slat transmission outboard of the bevel gearbox 6011CM (Ref. AMM TASK 27-50-00-400-003).
(6) Install the 98D27504030001 LOCK-TORQUE SHAFT (FLAPS AND SLATS) WITH CLAMP-PIVOT to lock the right slat transmission outboard of the bevel gearbox 6061CM (Ref. AMM TASK 27-50-00-400-003).
(7) Put a CONTAINER - HYDRAULIC FLUID RESISTANT in position below the Power Control Unit (PCU) (1).
4. Procedure(1) Make sure that the Green and the Blue hydraulic systems are depressurized and put them in the maintenance configuration. (Ref. AMM TASK 29-00-00-864-001).
(2) Depressurize the reservoirs of the Green and the Blue hydraulic systems (Ref. AMM TASK 29-14-00-614-001).
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems.
(4) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the main gear main door opening.
(5) Install the 98D27504030001 LOCK-TORQUE SHAFT (FLAPS AND SLATS) WITH CLAMP-PIVOT to lock the left slat transmission outboard of the bevel gearbox 6011CM (Ref. AMM TASK 27-50-00-400-003).
(6) Install the 98D27504030001 LOCK-TORQUE SHAFT (FLAPS AND SLATS) WITH CLAMP-PIVOT to lock the right slat transmission outboard of the bevel gearbox 6061CM (Ref. AMM TASK 27-50-00-400-003).
(7) Put a CONTAINER - HYDRAULIC FLUID RESISTANT in position below the Power Control Unit (PCU) (1).
Subtask 27-84-51-020-050-A
A. Removal of the Power Control Unit
(a) Move the spring (15) and remove the pin (14).
(b) Remove the nuts (13) and the bolts (12) which connect the torque shaft (11) to the input universal joint (10) of the PCU (1).
(c) Disconnect the torque shaft (11) from the input universal joint (10).
(d) Remove the input universal joint (10) from the PCU (1).
(2) Prepare the PCU (1) for removal as follows:
(a) Disconnect the hydraulic lines (50).
(b) Remove the tie wraps (41) and disconnect the seal drain lines (40).
(c) Disconnect the case drain lines (59) and (60).
(d) Install CAP - BLANKING on the open line ends (50).
(e) Install the PLUG - BLANKING in the ports of the PCU (1).
(f) Disconnect the electrical connectors 26CV-A, 28CV-A, 28CV-B, 25CV-A, 4CN-B and 4CN-A.
(g) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(h) Disconnect the electrical leads from the clamps which connect them to the PCU (1).
(i) Remove and discard the cotter pins (20).
(j) Remove the nut (18) and the washer (19) from the bolt (16) which connects the PCU (1) to the attachment rod assembly (22).
(k) Remove the nut (18) and the washer (19) from the bolt (26) which connects the PCU (1) to the adjustable rod assembly (23).
(l) Cut, remove and discard the lockwire from the nut (6).
(m) Remove the nut (6), the washer (5) and the bolt (28).
(n) Remove the nut (4) and the washer (3) from the attachment bolt (27).
(o) Remove the screw (7), the washer (8) and the bonding jumper (9).
(3) Hold the PCU (1) so that it can not fall.
(5) Remove the bolt (26) and the bush (25) from the adjustable rod assembly (23).
(6) Remove the attachment bolt (27) and the bush (2).
(7) Remove the PCU (1).
CAUTION:
USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.
(1) Disconnect the torque shaft 6002CM (11) as follows: (a) Move the spring (15) and remove the pin (14).
(b) Remove the nuts (13) and the bolts (12) which connect the torque shaft (11) to the input universal joint (10) of the PCU (1).
(c) Disconnect the torque shaft (11) from the input universal joint (10).
(d) Remove the input universal joint (10) from the PCU (1).
(2) Prepare the PCU (1) for removal as follows:
(a) Disconnect the hydraulic lines (50).
(b) Remove the tie wraps (41) and disconnect the seal drain lines (40).
(c) Disconnect the case drain lines (59) and (60).
(d) Install CAP - BLANKING on the open line ends (50).
(e) Install the PLUG - BLANKING in the ports of the PCU (1).
(f) Disconnect the electrical connectors 26CV-A, 28CV-A, 28CV-B, 25CV-A, 4CN-B and 4CN-A.
(g) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(h) Disconnect the electrical leads from the clamps which connect them to the PCU (1).
(i) Remove and discard the cotter pins (20).
(j) Remove the nut (18) and the washer (19) from the bolt (16) which connects the PCU (1) to the attachment rod assembly (22).
(k) Remove the nut (18) and the washer (19) from the bolt (26) which connects the PCU (1) to the adjustable rod assembly (23).
(l) Cut, remove and discard the lockwire from the nut (6).
(m) Remove the nut (6), the washer (5) and the bolt (28).
(n) Remove the nut (4) and the washer (3) from the attachment bolt (27).
(o) Remove the screw (7), the washer (8) and the bonding jumper (9).
(3) Hold the PCU (1) so that it can not fall.
NOTE: The PCU weighs approximately 20 kg (44.0924 lb).
(4) Remove the bolt (16) and the bush (17) from the attachment rod assembly (22). (5) Remove the bolt (26) and the bush (25) from the adjustable rod assembly (23).
(6) Remove the attachment bolt (27) and the bush (2).
(7) Remove the PCU (1).