DOC AIRBUS | AMM A320FInstallation of the Bleed Valve Stop Mechanism [CFMI]
TASK 75-31-20-400-001-A
Installation of the Bleed Valve Stop Mechanism
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 75-31-20-860-050-A ** ON A/C NOT FOR ALL
Subtask 75-31-20-420-053-A ** ON A/C NOT FOR ALL
Subtask 75-31-20-410-052-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:08:16 UTC
Installation of the Bleed Valve Stop Mechanism
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2101) | graphite grease |
| (Material No.CP2442) | engine oil |
| (Material No.CP8001) | lockwire 0.032 in. (0.8 mm) dia. |
| (Material No.CP8002) | lockwire 0.032 in. (0.8 mm) dia |
| 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 |
|---|---|---|
| 50 | O-RING | AIPC 75-00-00-15-110 |
| 80 | O-RING | AIPC 75-00-00-15-120 |
| 50 | O-RING | AIPC 75-00-00-15-170 |
| 80 | O-RING | AIPC 75-00-00-15-180 |
| 200 | O-RING | AIPC 75-31-10-01-040 |
| 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 72-23-00-000-005-A | Removal of the Fan Duct Panels |
| TASK 72-23-00-400-005-A | Installation of the Fan Duct Panels |
| TASK 73-29-00-710-040-A | Operational Test of the FADEC on the ground (with Engine Motoring) |
| TASK 73-29-00-710-040-A-01 | FADEC Ground Test Without the CFDS |
| TASK 73-29-00-710-040-A-02 | Operational Test of the FADEC on the Ground (with Engine non Motoring) |
| TASK 75-31-00-200-001-A | Manual Operation Check of the Variable Bleed Valve Doors |
| TASK 75-31-20-820-002-A | Set the Variable Bleed Valve Assembly to the Closed Position |
| TASK 75-31-70-000-001-A | Removal of the Variable Bleed Valve Position Sensor |
| TASK 75-31-70-400-001-A | Installation of the Variable Bleed Valve Position Sensor |
| 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 78-36-00-010-040-A | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-A | Closing of the Thrust Reverser Doors |
Shroud Tubes Connection on VBV Fuel Gear MotorSubtask 75-31-20-860-050-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).
Subtask 75-31-20-010-063-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).
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.
(3) Make sure that the fan duct panels are removed (Ref. AMM TASK 72-23-00-000-005).
(4) Make sure that the VBV is in the closed position (Ref. AMM TASK 75-31-20-820-002).
(5) Make sure that the VBV feedback sensor is removed (Ref. AMM TASK 75-31-70-000-001).
Subtask 75-31-20-040-054-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.
(3) Make sure that the fan duct panels are removed (Ref. AMM TASK 72-23-00-000-005).
(4) Make sure that the VBV is in the closed position (Ref. AMM TASK 75-31-20-820-002).
(5) Make sure that the VBV feedback sensor is removed (Ref. AMM TASK 75-31-70-000-001).
Subtask 75-31-20-420-053-A ** ON A/C NOT FOR ALL
A. Installation of the VBV Stop Mechanism
(1) Remove PLUG - BLANKING from the VBV fuel gear motor and let the storage oil drain in a CONTAINER 20 L - SHALLOW (if necessary).
(2) Assemble the stop mechanism (140) and the bleed valve fuel gear motor (40) as follows:
(b) Engage the fuel gear motor (40) in the bleed valve stop mechanism (140). Align the 4 attachment holes of the fuel gear motor with those on the stop mechanism mounting baseplate. Make sure that the O-ring (200) remains correctly installed in its groove.
(c) Lubricate the 4 bolts (100) with graphite grease (Material No.CP2101) and install them with washers (110). Hand-tighten bolts (100).
(3) TORQUE the 4 bolts (100) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )
.
PRE SB CFM56-5 72-469
Not applicable
End of PRE SB CFM56-5 72-469
POST SB CFM56-5 72-469
(a) Flexible shaft/ferrule configuration.
End of POST SB CFM56-5 72-469
(b) Engage the main flexible shaft (the end with the helical spring, first) in the stop mechanism (140) but not deep enough to drive the gears of the fuel gear motor in rotation.
Make sure the spring is present in the main flexible shaft.
Turn the main flexible shaft COUNTER CLOCKWISE, as shown by the arrow on the aft mounting baseplate of the stop mechanism (140).
(c) Make sure that all the variable bleed valves are in the CLOSED position. If not, fully close them (Ref. AMM TASK 75-31-20-820-002).
(d) Engage the bleed valve stop mechanism in the fan frame cavity. Align the attachment holes (of its fan frame-facing baseplate) with those in the fan frame.
Engage the hexagonal end of the main flexible shaft in the hex drive of the bleed valve and master ballscrew actuator.
(f) TORQUE the bolts (190) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN ).
(5) Connect the VBV CLOSED and the VBV OPEN shroud tubes (10) and (30) to the fuel gear motor (40) as follows.
(a) Lubricate new AIPC 75-00-00-15-110 O-RING (50) and new AIPC 75-00-00-15-120 O-RING (80) with engine oil (Material No.CP2442) and install in the grooves on shroud tube (30) sliding sleeve (70).
(b) Lubricate new AIPC 75-00-00-15-170 O-RING (50) and new AIPC 75-00-00-15-180 O-RING (80) with engine oil (Material No.CP2442) and install in the grooves on shroud tube (10) sliding sleeve (70).
(c) Connect the connecting nuts:
. Safety the nut (90) to the nipple with CP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia
Subtask 75-31-20-720-051-A ** ON A/C NOT FOR ALL (1) Remove PLUG - BLANKING from the VBV fuel gear motor and let the storage oil drain in a CONTAINER 20 L - SHALLOW (if necessary).
(2) Assemble the stop mechanism (140) and the bleed valve fuel gear motor (40) as follows:
CAUTION:
KEEP THE MOTOR PERPENDICULAR TO THE MOUNTING SURFACE TO PREVENT DAMAGE TO THE SPLINES, WHEN YOU INSTALL THE BLEED VALVE FUEL GEAR MOTOR ON THE BLEED VALVE STOP MECHANISM.
(a) Lubricate a new AIPC 75-31-10-01-040 O-RING (200) with engine oil (Material No.CP2442) and install it in the groove of the fuel gear motor housing. (b) Engage the fuel gear motor (40) in the bleed valve stop mechanism (140). Align the 4 attachment holes of the fuel gear motor with those on the stop mechanism mounting baseplate. Make sure that the O-ring (200) remains correctly installed in its groove.
(c) Lubricate the 4 bolts (100) with graphite grease (Material No.CP2101) and install them with washers (110). Hand-tighten bolts (100).
(3) TORQUE the 4 bolts (100) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )
. CAUTION:
BE CAREFUL NOT TO CAUSE DAMAGE TO THE PROTECTING BOOT (PRE CFM SB 75-0038) ON THE BLEED-VALVE FUEL GEAR MOTOR ASSEMBLY DURING INSTALLATION. ONLY BLEED VALVE STOP MECHANISM WHICH INCLUDES PACKED SEALED BEARINGS, HAS NOT A PROTECTING BOOT (POST CFM SB 75-0038).
(4) Install the bleed valve fuel gear motor and stop mechanism assembly on the (rear surface) of fan frame as follows: PRE SB CFM56-5 72-469
Not applicable
End of PRE SB CFM56-5 72-469
POST SB CFM56-5 72-469
(a) Flexible shaft/ferrule configuration.
CAUTION:
THE INNER DIAMETER OF THE NEW FERRULE HAS BEEN INCREASED AS THE HEXAGONAL END OF THE NEW MAIN FLEXIBLE SHAFT HAS BEEN ENLARGED.
1 do not mix old and new configuration of flexible shaft/ferrule assembly. End of POST SB CFM56-5 72-469
(b) Engage the main flexible shaft (the end with the helical spring, first) in the stop mechanism (140) but not deep enough to drive the gears of the fuel gear motor in rotation.
Make sure the spring is present in the main flexible shaft.
Turn the main flexible shaft COUNTER CLOCKWISE, as shown by the arrow on the aft mounting baseplate of the stop mechanism (140).
NOTE: As you turn the main flexible shaft, you drive a torque shaft which moves a follower nut in translation inside the stop mechanism.
When you feel you can no longer turn the main flexible shaft COUNTER CLOCKWISE, the follower nut is against the CLOSED mechanical stop. This state relates to the CLOSED position of the VBV system. (c) Make sure that all the variable bleed valves are in the CLOSED position. If not, fully close them (Ref. AMM TASK 75-31-20-820-002).
(d) Engage the bleed valve stop mechanism in the fan frame cavity. Align the attachment holes (of its fan frame-facing baseplate) with those in the fan frame.
Engage the hexagonal end of the main flexible shaft in the hex drive of the bleed valve and master ballscrew actuator.
NOTE: A slight rotation of the main flexible shaft (CW or 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.
(e) Lubricate the threads of the 8 bolts (190) with graphite grease (Material No.CP2101) and install them to attach the stop mechanism and fuel gear motor assembly to the fan frame. (f) TORQUE the bolts (190) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )
. (5) Connect the VBV CLOSED and the VBV OPEN shroud tubes (10) and (30) to the fuel gear motor (40) as follows.
(a) Lubricate new AIPC 75-00-00-15-110 O-RING (50) and new AIPC 75-00-00-15-120 O-RING (80) with engine oil (Material No.CP2442) and install in the grooves on shroud tube (30) sliding sleeve (70).
(b) Lubricate new AIPC 75-00-00-15-170 O-RING (50) and new AIPC 75-00-00-15-180 O-RING (80) with engine oil (Material No.CP2442) and install in the grooves on shroud tube (10) sliding sleeve (70).
(c) Connect the connecting nuts:
CAUTION:
USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:
1 Connect the connecting nut (90) of the internal tube line to the nipples of the fuel gear motor. TORQUE each nut (90) to between 200 and 180 lbf.in (2.26 and 2.03 m.daN ) - ONE WRENCH TO HOLD THE UNION, AND
- ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.
. Safety the nut (90) to the nipple with CAUTION:
CORRECT RIGGING OF THE VBV FEEDBACK SENSOR SHALL BE DONE AS TOLD IN THIS PROCEDURE TO AVOID FURTHER FAILURE OF THE VBV SYSTEM.
(6) Install the VBV feedback (RVDT) sensor (Ref. AMM TASK 75-31-70-400-001). B. Do the following tests.
(1) Do a manual operation check of the Variable Bleed Valve doors (Ref. AMM TASK 75-31-00-200-001).
(2) Do an operational test of the FADEC on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
Subtask 75-31-20-420-054-A ** ON A/C NOT FOR ALL (1) Do a manual operation check of the Variable Bleed Valve doors (Ref. AMM TASK 75-31-00-200-001).
(2) Do an operational test of the FADEC on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
C. Installation of the Port Tubes, Brackets and Clamps
(1) Move the sliding sleeves (70) and outer nuts (60) upward. Tighten the 2 outer nuts (60) fully by hand. Safety the outer nuts (60) together withCP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia
(2) Lubricate the drain nipples of the sliding sleeves (70) with engine oil (Material No.CP2442) . Connect the 2 tube branches of the U-shaped fuel drain manifold to the drain nipples of sliding sleeves (70). TORQUE the drain tube coupling nuts to between 150 and 135 lbf.in (1.70 and 1.53 m.daN ).
(3) Install the bracket (140) and flexible clamp (130) on the fuel gear motor (40) as follows:
(a) Lubricate the threads of bolt (120) with graphite grease (Material No.CP2101) .
(b) Install flexible clamp (130) and the two elements of bracket (140) around the "VBV CLOSED" end of fuel gear motor (40).
(c) Put the bracket in its correct position and install bolt (120) and nut (180). TORQUE bolt (120) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN ).
(d) Lubricate the threads of bolt (150) with graphite grease (Material No.CP2101) .
(e) Put the clamps (160) and (170) of electrical cables CJ11L and CJ12L in their correct position relative to bracket (140). Attach clamps (160) and (170) to bracket (140) with bolt (150). TORQUE bolt (150) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN ).
(4) If necessary, TORQUE the bolt (which attaches together the 2 clamps on the left-hand branch (20) of the U-shaped drain manifold and on the fuel line to the VBV fuel gear motor OPEN port) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN ).
Subtask 75-31-20-410-050-A ** ON A/C NOT FOR ALL Subtask 75-31-20-710-058-A ** ON A/C NOT FOR ALL 5. Close-up(1) Move the sliding sleeves (70) and outer nuts (60) upward. Tighten the 2 outer nuts (60) fully by hand. Safety the outer nuts (60) together with
(2) Lubricate the drain nipples of the sliding sleeves (70) with engine oil (Material No.CP2442) . Connect the 2 tube branches of the U-shaped fuel drain manifold to the drain nipples of sliding sleeves (70). TORQUE the drain tube coupling nuts to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )
. (3) Install the bracket (140) and flexible clamp (130) on the fuel gear motor (40) as follows:
(a) Lubricate the threads of bolt (120) with graphite grease (Material No.CP2101) .
(b) Install flexible clamp (130) and the two elements of bracket (140) around the "VBV CLOSED" end of fuel gear motor (40).
(c) Put the bracket in its correct position and install bolt (120) and nut (180). TORQUE bolt (120) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN )
. (d) Lubricate the threads of bolt (150) with graphite grease (Material No.CP2101) .
(e) Put the clamps (160) and (170) of electrical cables CJ11L and CJ12L in their correct position relative to bracket (140). Attach clamps (160) and (170) to bracket (140) with bolt (150). TORQUE bolt (150) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN )
. (4) If necessary, TORQUE the bolt (which attaches together the 2 clamps on the left-hand branch (20) of the U-shaped drain manifold and on the fuel line to the VBV fuel gear motor OPEN port) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN )
. Subtask 75-31-20-410-052-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 the 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 75-31-20-440-052-A ** ON A/C NOT FOR ALL Subtask 75-31-20-410-061-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 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.