DOC AIRBUS | AMM A320FInstallation of the Variable Bleed Valve Position Sensor [CFMI]
TASK 75-31-70-400-001-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 75-31-70-860-050-A ** ON A/C NOT FOR ALL
Subtask 75-31-70-420-050-A ** ON A/C NOT FOR ALL
Subtask 75-31-70-410-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 07:39:57 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 |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| 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 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 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 |
VBV Feedback Sensor - PRE SB CFM 75-045Subtask 75-31-70-860-050-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 75-31-70-010-052-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 75-31-70-040-050-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 75-31-70-420-050-A ** ON A/C NOT FOR ALL
A. Installation of the VBV Position Sensor:
PRE SB CFM 75-045
POST SB CFM 75-045
END OF SB CFM 75-045
(1) Remove blanking plugs.
PRE SB CFM 75-045
(2) Install VBV feedback sensor on stop mechanism and secure with bolts (50), threads lightly coated with graphite grease (Material No.CP2101) .
POST SB CFM 75-045
(3) Install VBV feedback sensor
(b) Lightly coat with brisal-OX (Material No.CP2338) the mating faces cleaned before.
(c) Install VBV feedback sensor on stop mechanism and secure with bolts (50), threads lightly coated with graphite grease (Material No.CP2101) .
(d) Attach the bonding strap to the VBV feedback sensor with bolt (55), threads lightly coated with graphite grease (Material No.CP2101) .
END OF SB CFM 75-045
(4) TORQUE bolts to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
.
(5) Set VBV feedback sensor as follows :
(a) Install straight-headed pin (60) securing feedback rod clevis (20) to VBV sensor.
(b) Check that sensor arm is well aligned with reference mark. If not aligned, loosen nut (10), remove pin (60) and set assembly by turning clevis by haft-turns. TORQUE nut (10) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN ).
(c) Check for adequate threads engagement by making sure that a 0.08 in. (2 mm) diameter gage wire does not pass through witness hole.
(d) Lightly coat threads of straight-headed pin (60) with graphite grease (Material No.CP2101) and secure clevis with pin (60) and nut (30). TORQUE nut to between 30 and 28 lbf.in (0.34 and 0.32 m.daN ).
(6) Connect the two electrical cables.
(7) Check of the VBV position (only with 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 VBV is between -0.8 and 0.0 degrees.
Subtask 75-31-70-410-051-A ** ON A/C NOT FOR ALL PRE SB CFM 75-045
POST SB CFM 75-045
END OF SB CFM 75-045
(1) Remove blanking plugs.
PRE SB CFM 75-045
(2) Install VBV feedback sensor on stop mechanism and secure with bolts (50), threads lightly coated with graphite grease (Material No.CP2101) .
POST SB CFM 75-045
(3) Install 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 bonding strap (70), bolt (55) and hole where the bonding strap will be attached of VBV feedback sensor and 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 mating faces cleaned before.
(c) Install VBV feedback sensor on stop mechanism and secure with bolts (50), threads lightly coated with graphite grease (Material No.CP2101) .
(d) Attach the bonding strap to the VBV feedback sensor with bolt (55), threads lightly coated with graphite grease (Material No.CP2101) .
END OF SB CFM 75-045
(4) TORQUE bolts to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
. (5) Set VBV feedback sensor as follows :
(a) Install straight-headed pin (60) securing feedback rod clevis (20) to VBV sensor.
(b) Check that sensor arm is well aligned with reference mark. If not aligned, loosen nut (10), remove pin (60) and set assembly by turning clevis by haft-turns. TORQUE nut (10) to between 70 and 60 lbf.in (0.79 and 0.68 m.daN )
. (c) Check for adequate threads engagement by making sure that a 0.08 in. (2 mm) diameter gage wire does not pass through witness hole.
(d) Lightly coat threads of straight-headed pin (60) with graphite grease (Material No.CP2101) and secure clevis with pin (60) and nut (30). TORQUE nut to between 30 and 28 lbf.in (0.34 and 0.32 m.daN )
. (6) Connect the two electrical cables.
(7) Check of the VBV position (only with 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 VBV is between -0.8 and 0.0 degrees.
B. 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
(3) Remove the WARNING NOTICE(S).
Subtask 75-31-70-440-050-A ** ON A/C NOT FOR ALL Subtask 75-31-70-710-050-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
(3) 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 75-31-70-410-050-A ** ON A/C NOT FOR ALL