DOC AIRBUS | AMM A320FInstallation of the Bleed Valve and Master Ballscrew Actuator Assembly [CFMB]
TASK 75-31-50-400-002-A
Installation of the Bleed Valve and Master Ballscrew Actuator Assembly
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 75-31-50-860-050-A ** ON A/C NOT FOR ALL
Subtask 75-31-50-720-053-A ** ON A/C NOT FOR ALL
Subtask 75-31-50-410-055-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:10:46 UTC
Installation of the Bleed Valve and Master Ballscrew Actuator Assembly
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 | AR | WRENCH 5/64 IN - HEXAGONAL |
| No specific | Torque wrench: range to between 35 and 25 lbf.in (0.40 and 0.28 m.daN )  | |
| No specific | Torque wrench: range to between 36.3 and 30 lbf.in (0.41 and 0.34 m.daN ) | |
| No specific | Torque wrench: range to between 115 and 105 lbf.in (1.30 and 1.19 m.daN ) | |
| 856A2501 | 1 | WRENCH-VBV MANUAL CONTROL |
| 856A3114 | 1 | WRENCH-VBV BALLSCREW ACTUATOR |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2101) | graphite grease |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 120 | COTTER PIN | AIPC 75-31-70-01-130 |
| 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 72-23-00-000-027-A | Removal of the Fan Duct Panels |
| TASK 72-23-00-400-027-A | Installation of the Fan Duct Panels |
| TASK 73-29-00-710-040-B | Operational Test of the FADEC on the Ground (with Engine Motoring) |
| TASK 73-29-00-710-040-B-02 | Operational Test of the FADEC on the Ground (with Engine Non motoring) |
| TASK 75-31-00-200-002-A | Manual Operation Check of the Variable Bleed Valve Doors |
| TASK 75-31-00-820-001-A | Adjustment of the Reference CLOSED Position of the VBV System |
| TASK 75-31-70-400-002-A | Installation of the Variable Bleed Valve position Sensor |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-B | Closing of the Thrust Reverser Doors |
Bleed Valve and Master Ballscrew Actuator AssemblySubtask 75-31-50-860-050-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 75-31-50-010-056-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. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 75-31-50-040-051-A ** ON A/C NOT FOR ALL 4. Procedure(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 75-31-50-720-053-A ** ON A/C NOT FOR ALL
A. Prepare the installation of the Bleed Valve and Master Ballscrew as follows:
(1) Clean the component interfaces and the adjacent area.
(2) Do a visual inspection of the component interface and/or the adjacent area.
(3) Make sure that the translating nut of the bleed valve and master ballscrew actuator can move without binding.
(4) Set the bleed valve near the closed position.
(5) Make sure that the retaining nuts on the captive bolts (40) and (50) are in the correct position. If not, adjust with a 856A3114 WRENCH-VBV BALLSCREW ACTUATOR (856A3114G01).
(6) Make sure that the Variable Bleed Valve (VBV) stop mechanism is in the CLOSED stop position as follows.
Subtask 75-31-50-420-051-A ** ON A/C NOT FOR ALL (1) Clean the component interfaces and the adjacent area.
(2) Do a visual inspection of the component interface and/or the adjacent area.
(3) Make sure that the translating nut of the bleed valve and master ballscrew actuator can move without binding.
(4) Set the bleed valve near the closed position.
(5) Make sure that the retaining nuts on the captive bolts (40) and (50) are in the correct position. If not, adjust with a 856A3114 WRENCH-VBV BALLSCREW ACTUATOR (856A3114G01).
(6) Make sure that the Variable Bleed Valve (VBV) stop mechanism is in the CLOSED stop position as follows.
CAUTION:
TAKE CARE NOT TO DAMAGE THE PROTECTIVE BOOT ON THE STOP MECHANISM.
(a) Turn the main flexible shaft (10) fully counterclockwise (aft looking forward) engaged in the VBV stop mechanism (90). B. Install the bleed valve and master ballscrew actuator (30).
(1) Push the main flexible shaft (10) into the bleed valve stop mechanism (90) and hold it that way.
Make sure the spring is present on the main flexible shaft.
(a) Visually check for the presence of the silicone rubber plug (replace the bleed valve and master ballscrew if missing).
(b) Put the actuator (30) in its correct attitude and position and release the main flexible shaft (10) so that it comes fully against the mating faces of the master ballscrew actuator (30) and of the bleed valve stop mechanism (90).
(3) Tighten the screws (70) which attach the bleed valve and master ballscrew actuator to the 9 o'clock fan frame strut (aft looking forward) by hand.
(5) Make sure that the master VBV door engages in the fan frame. If not, do the steps below:
(a) Push the hexagonal end of the main flexible shaft in the stop mechanism (90), and disengage it. Use a WRENCH 5/64 IN - HEXAGONAL across flats.
(b) With the 856A2501 WRENCH-VBV MANUAL CONTROL (856A2501G01) turn the control drive of the bleed valve and master ballscrew actuator (30) to move the VBV door as necessary. Make sure that the door is correctly adjusted in its fan frame seat.
(6) TORQUE the two screws (70) to between 35 and 25 lbf.in (0.40 and 0.28 m.daN ).
(7) TORQUE the two upper horizontal bolts (50) then the two lower vertical bolts (40) to between 115 and 105 lbf.in (1.30 and 1.19 m.daN ).
(8) Set the VBV door to the reference CLOSED position as follows:
(a) Disengage the hexagonal end of the main flexible shaft (10) while you push it into the VBV stop mechanism (90) with a WRENCH 5/64 IN - HEXAGONAL across flats.
(b) Adjust the reference CLOSED position of the door (Ref. AMM TASK 75-31-00-820-001).
(9) Engage the main flexible shaft (10) again in its housing.
(10) Attach the access cover (160) with screw (170). Tighten bolt (150) and screw (170).
(11) Engage the hexagonal end (spring side) of each flexible shaft (20) in the applicable actuator assembly, through the fan frame struts.
(12) Compress the spring and engage the opposite end of the flexible shaft (20) into the adjacent actuator assembly.
(13) Make sure that the master ballscrew is still in the reference CLOSED position.
(14) Remove the fan duct panels which cover the fan frame cavities in which the 11 other (follower) VBV assemblies are installed (Ref. AMM TASK 72-23-00-000-027).
(15) Make sure of the correct reference CLOSED position of the 11 other VBV doors and adjust it, if necessary (Ref. AMM TASK 75-31-00-820-001).
(16) Connect the VBV feedback rod (80) on the bleed valve and master ballscrew actuator (30) as follows:
(a) Engage the clevis end of rod (80) on the feedback reverser arm (60).
(b) Apply a thin layer of graphite grease (Material No.CP2101) to the threads of bolt (100).
(c) Install the bolt (100), the washer (140) and the castellated nut (130).
(d) TORQUE the castellated nut (130) to between 36.3 and 30 lbf.in (0.41 and 0.34 m.daN ) and tighten to align one slot of the nut with the mounting bolt pin hole.
(17) Make sure that the VBV feedback sensor arm is correctly aligned with the sensor mark. If not, adjust the sensor (Ref. AMM TASK 75-31-70-400-002).
(18) Engage the 856A2501 WRENCH-VBV MANUAL CONTROL (856A2501G01), in one of the VBV doors actuator, each side of the No. 4 fan frame strut (strut located at 3 o'clock). Operate the system manually in the two directions and make sure that it moves freely.
(19) Do a manual operation check of the VBV doors (Ref. AMM TASK 75-31-00-200-002).
(20) Install fan duct panels, on each side of the fan frame strut at 9 o'clock (aft looking forward) (Ref. AMM TASK 72-23-00-400-027).
(21) Do an operational test of the FADEC on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
5. Close-up(1) Push the main flexible shaft (10) into the bleed valve stop mechanism (90) and hold it that way.
Make sure the spring is present on the main flexible shaft.
(a) Visually check for the presence of the silicone rubber plug (replace the bleed valve and master ballscrew if missing).
(b) Put the actuator (30) in its correct attitude and position and release the main flexible shaft (10) so that it comes fully against the mating faces of the master ballscrew actuator (30) and of the bleed valve stop mechanism (90).
NOTE: A slight rotation of the main flexible shaft (Clockwise (CW) or Counterclockwise (CCW)) may be necessary to get the correct engagement of the main flexible shaft in the hex drive of bleed valve and master ballscrew actuator.
(2) Make sure of the correct position of the main flexible shaft in its housing before continuing the installation of the master ballscrew actuator. (3) Tighten the screws (70) which attach the bleed valve and master ballscrew actuator to the 9 o'clock fan frame strut (aft looking forward) by hand.
NOTE: Do not lubricate the threads of the bolts.
(4) Tighten the horizontal captive bolts (50) then the vertical captive bolts (40) by hand. (5) Make sure that the master VBV door engages in the fan frame. If not, do the steps below:
(a) Push the hexagonal end of the main flexible shaft in the stop mechanism (90), and disengage it. Use a WRENCH 5/64 IN - HEXAGONAL across flats.
(b) With the 856A2501 WRENCH-VBV MANUAL CONTROL (856A2501G01) turn the control drive of the bleed valve and master ballscrew actuator (30) to move the VBV door as necessary. Make sure that the door is correctly adjusted in its fan frame seat.
(6) TORQUE the two screws (70) to between 35 and 25 lbf.in (0.40 and 0.28 m.daN )
. (7) TORQUE the two upper horizontal bolts (50) then the two lower vertical bolts (40) to between 115 and 105 lbf.in (1.30 and 1.19 m.daN )
. (8) Set the VBV door to the reference CLOSED position as follows:
(a) Disengage the hexagonal end of the main flexible shaft (10) while you push it into the VBV stop mechanism (90) with a WRENCH 5/64 IN - HEXAGONAL across flats.
(b) Adjust the reference CLOSED position of the door (Ref. AMM TASK 75-31-00-820-001).
(9) Engage the main flexible shaft (10) again in its housing.
(10) Attach the access cover (160) with screw (170). Tighten bolt (150) and screw (170).
(11) Engage the hexagonal end (spring side) of each flexible shaft (20) in the applicable actuator assembly, through the fan frame struts.
(12) Compress the spring and engage the opposite end of the flexible shaft (20) into the adjacent actuator assembly.
(13) Make sure that the master ballscrew is still in the reference CLOSED position.
(14) Remove the fan duct panels which cover the fan frame cavities in which the 11 other (follower) VBV assemblies are installed (Ref. AMM TASK 72-23-00-000-027).
(15) Make sure of the correct reference CLOSED position of the 11 other VBV doors and adjust it, if necessary (Ref. AMM TASK 75-31-00-820-001).
(16) Connect the VBV feedback rod (80) on the bleed valve and master ballscrew actuator (30) as follows:
(a) Engage the clevis end of rod (80) on the feedback reverser arm (60).
(b) Apply a thin layer of graphite grease (Material No.CP2101) to the threads of bolt (100).
(c) Install the bolt (100), the washer (140) and the castellated nut (130).
(d) TORQUE the castellated nut (130) to between 36.3 and 30 lbf.in (0.41 and 0.34 m.daN )
and tighten to align one slot of the nut with the mounting bolt pin hole. NOTE: The maximum torque permitted is 45 lbf.in (0.51 m.daN) . If you cannot obey the minimum and maximum torque values, you must install a new nut.
(e) Install a new AIPC 75-31-70-01-130 COTTER PIN (120). (17) Make sure that the VBV feedback sensor arm is correctly aligned with the sensor mark. If not, adjust the sensor (Ref. AMM TASK 75-31-70-400-002).
(18) Engage the 856A2501 WRENCH-VBV MANUAL CONTROL (856A2501G01), in one of the VBV doors actuator, each side of the No. 4 fan frame strut (strut located at 3 o'clock). Operate the system manually in the two directions and make sure that it moves freely.
(19) Do a manual operation check of the VBV doors (Ref. AMM TASK 75-31-00-200-002).
(20) Install fan duct panels, on each side of the fan frame strut at 9 o'clock (aft looking forward) (Ref. AMM TASK 72-23-00-400-027).
(21) Do an operational test of the FADEC on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
Subtask 75-31-50-410-055-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 75-31-50-440-050-A ** ON A/C NOT FOR ALL Subtask 75-31-50-410-054-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 thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR