DOC AIRBUS | AMM A320FInstallation of the Variable Bleed Valve position Sensor [CFMB]
TASK 75-31-70-400-002-A
Installation of the Variable Bleed Valve position Sensor
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. Referenced Information
3. Job Set-up
Subtask 75-31-70-860-051-A ** ON A/C NOT FOR ALL
Subtask 75-31-70-420-051-A ** ON A/C NOT FOR ALL
Subtask 75-31-70-410-053-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:08:32 UTC
Installation of the Variable Bleed Valve position Sensor
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.CP1039) | acetone |
| (Material No.CP2011) | stoddard solvent |
| (Material No.CP2101) | graphite grease |
| (Material No.CP2338) | brisal-OX |
| (Material No.CP2559) | ardrox 552 |
| (Material No.CP2560) | turco ind 79 |
| (Material No.CP2566) | mag-chem teksol |
| (Material No.CP2584) | degreasol 99 R |
| (Material No.CP2656) | mag-chem skysol |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| 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 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 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 |
Variable Bleed Valve (VBV) Feedback Sensor - PRE SB CFM 75-006Subtask 75-31-70-860-051-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 75-31-70-010-055-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
Subtask 75-31-70-040-053-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 75-31-70-420-051-A ** ON A/C NOT FOR ALL
A. Installation of the Variable Bleed Valve (VBV) Position Sensor
PRE SB CFM 75-006
POST SB CFM 75-006
END OF SB CFM 75-006
(1) Remove the blanking plugs.
PRE SB CFM 75-006
(2) Install the VBV feedback sensor on the stop mechanism and secure it with the bolts (50), with the threads lightly coated with graphite grease (Material No.CP2101) .
(3) TORQUE the bolts (50) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
.
POST SB CFM 75-006
(4) Install the VBV feedback sensor:
(b) Lightly coat with brisal-OX (Material No.CP2338) the surfaces that you cleaned before.
(c) Install the VBV feedback sensor on the stop mechanism and secure it with the bolts (50), with the threads lightly coated with graphite grease (Material No.CP2101) .
(d) Secure the VBV feedback sensor with the bonding strap (70) on the stop mechanism with the bolt (55), with the threads lightly coated with graphite grease (Material No.CP2101) .
(5) TORQUE the bolts (50) and (55) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN ).
END OF SB CFM 75-006
(6) Set the VBV feedback sensor as follows:
(a) Install the pin (60) securing the feedback rod clevis (20) on the VBV sensor (40).
(b) Check that the sensor arm is well aligned with the reference marks. If not aligned, loosen the nut (10), remove the pin (60) and set the assembly by turning the clevis by half-turns. TORQUE the nut (10) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN ).
(c) Check for the adequate engagement of the threads by making sure that a 0.08 in. (2 mm) diameter gage-wire does not pass through the witness hole.
(d) Lightly coat the threads of the pin (60) with graphite grease (Material No.CP2101) and secure the clevis with the pin (60) and the nut (30). TORQUE the nut (30) to between 30 and 28 lbf.in (0.34 and 0.32 m.daN ).
(7) Connect the two electrical cables.
(8) Check of the VBV position (only with the Aircraft Integrated Data System (AIDS) option):
(a) On the MCDU main menu page, push the line key adjacent to the AIDS indication.
(b) On the AIDS menu page, push the line key adjacent to the PARAM ALPHA CALL-UP indication.
(c) On the AIDS PARAM ALPHA CALL-UP page, make sure that the VBV is between -0.8 and 0.0 degrees. If the value that you read is between 54 and 64 degrees, this value is not correctly indicated by the AIDS.
1 If necessary, calculate the correct VBV value as follows:
Correct value = read value - 64 degrees
a Example: If the AIDS displays 63.5 degrees:
63.5 - 64 = -0.5
The correct value is -0.5 degrees.
Subtask 75-31-70-410-052-A ** ON A/C NOT FOR ALL PRE SB CFM 75-006
POST SB CFM 75-006
END OF SB CFM 75-006
(1) Remove the blanking plugs.
PRE SB CFM 75-006
(2) Install the VBV feedback sensor on the stop mechanism and secure it with the bolts (50), with the threads lightly coated with graphite grease (Material No.CP2101) .
(3) TORQUE the bolts (50) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
. POST SB CFM 75-006
(4) Install the VBV feedback sensor:
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
(a) Clean the mating surfaces of the bonding strap, the bolt (55), the contact surface of the VBV feedback sensor with the bonding strap and the stop mechanism with acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) . (b) Lightly coat with brisal-OX (Material No.CP2338) the surfaces that you cleaned before.
(c) Install the VBV feedback sensor on the stop mechanism and secure it with the bolts (50), with the threads lightly coated with graphite grease (Material No.CP2101) .
(d) Secure the VBV feedback sensor with the bonding strap (70) on the stop mechanism with the bolt (55), with the threads lightly coated with graphite grease (Material No.CP2101) .
(5) TORQUE the bolts (50) and (55) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
. END OF SB CFM 75-006
(6) Set the VBV feedback sensor as follows:
(a) Install the pin (60) securing the feedback rod clevis (20) on the VBV sensor (40).
(b) Check that the sensor arm is well aligned with the reference marks. If not aligned, loosen the nut (10), remove the pin (60) and set the assembly by turning the clevis by half-turns. TORQUE the nut (10) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )
. (c) Check for the adequate engagement of the threads by making sure that a 0.08 in. (2 mm) diameter gage-wire does not pass through the witness hole.
(d) Lightly coat the threads of the pin (60) with graphite grease (Material No.CP2101) and secure the clevis with the pin (60) and the nut (30). TORQUE the nut (30) to between 30 and 28 lbf.in (0.34 and 0.32 m.daN )
. (7) Connect the two electrical cables.
(8) Check of the VBV position (only with the Aircraft Integrated Data System (AIDS) option):
(a) On the MCDU main menu page, push the line key adjacent to the AIDS indication.
(b) On the AIDS menu page, push the line key adjacent to the PARAM ALPHA CALL-UP indication.
(c) On the AIDS PARAM ALPHA CALL-UP page, make sure that the VBV is between -0.8 and 0.0 degrees. If the value that you read is between 54 and 64 degrees, this value is not correctly indicated by the AIDS.
1 If necessary, calculate the correct VBV value as follows:
Correct value = read value - 64 degrees
a Example: If the AIDS displays 63.5 degrees:
63.5 - 64 = -0.5
The correct value is -0.5 degrees.
B. Close Access
Make sure that the work area is clean and clear of tools and other items.
(1) Close thrust reverser cowl doors: (Ref. AMM TASK 78-36-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(2) Remove the WARNING NOTICE(S).
Subtask 75-31-70-440-051-A ** ON A/C NOT FOR ALL Subtask 75-31-70-710-051-A ** ON A/C NOT FOR ALL Make sure that the work area is clean and clear of tools and other items.
(1) Close thrust reverser cowl doors: (Ref. AMM TASK 78-36-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(2) Remove the WARNING NOTICE(S).
D. Do the test that follows:
(1) Do a FADEC ground test with engine motoring (Ref. AMM TASK 73-29-00-710-040).
5. Close-up(1) Do a FADEC ground test with engine motoring (Ref. AMM TASK 73-29-00-710-040).
Subtask 75-31-70-410-053-A ** ON A/C NOT FOR ALL