DOC AIRBUS | AMM A320FRemoval of the Bleed Valve and Master Ballscrew Actuator [CFMI]
TASK 75-31-50-000-001-A
Removal of the Bleed Valve and Master Ballscrew Actuator
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 75-31-50-941-051-A ** ON A/C NOT FOR ALL
Subtask 75-31-50-010-062-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 07:39:56 UTC
Removal of the Bleed Valve and Master Ballscrew Actuator
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 | ALLEN KEY - DRIVER 2 MM (5/64 IN) |
| No specific | AR | WARNING NOTICE(S) |
| 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 72-23-00-000-005-A | Removal of the Fan Duct Panels |
| TASK 75-31-20-820-002-A | Set the Variable Bleed Valve Assembly to the Closed Position |
| TASK 75-31-30-000-003-A | Removal of a VBV Inter-connecting Flexible Shaft (Typical) |
| 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 |
Bleed Valve and Master Ballscrew Actuator AssemblySubtask 75-31-50-941-051-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 75-31-50-010-050-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 75-31-50-040-053-A ** ON A/C NOT FOR ALL Subtask 75-31-50-010-060-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
D. Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 75-31-50-010-062-A ** ON A/C NOT FOR ALL
A. Remove the fan duct panels between the strut at 8 o'clock and the strut at 11 o'clock positions (Ref. AMM TASK 72-23-00-000-005).
Subtask 75-31-50-820-054-A ** ON A/C NOT FOR ALL B. Set the Variable Bleed Valve (VBV) system to the CLOSED position (Ref. AMM TASK 75-31-20-820-002).
Subtask 75-31-50-020-052-A ** ON A/C NOT FOR ALL C. Removal of the Bleed Valve and Master Ballscrew Actuator
(1) Remove the 2 flexible shafts (90) located on each side of master ballscrew actuator (40) (Ref. AMM TASK 75-31-30-000-003).
(2) Disconnect the feedback rod (50) of the VBV from the bleed valve and master ballscrew actuator (40) as follows :
(a) Remove and discard cotter pin (170).
(b) Remove slotted nut (180).
(c) Remove washer (190).
(d) Remove bolt (200) and disengage clevis (150) from VBV feedback reverser arm (60). The arm (60) is on the Rotary Variable Differential Transducer (RVDT).
(3) Remove the 2 bracket screws (70) securing bleed valve and master ballscrew actuator (40) to fan frame (9 o'clock strut).
(4) Loosen the 4 main captive bolts (130 and 210) (upper horizontal and lower vertical) attaching bleed valve and master ballscrew actuator (40) to fan frame.
(5) Disengage the flexible shaft
(b) Disengage hexagonal end of main flexible shaft (80) by pushing it into the bleed valve stop mechanism (140) and bleed valve fuel gear motor assembly (10) using an ALLEN KEY - DRIVER 2 MM (5/64 IN) across flats.
(6) Remove bleed valve and master ballscrew actuator (40).
(1) Remove the 2 flexible shafts (90) located on each side of master ballscrew actuator (40) (Ref. AMM TASK 75-31-30-000-003).
(2) Disconnect the feedback rod (50) of the VBV from the bleed valve and master ballscrew actuator (40) as follows :
(a) Remove and discard cotter pin (170).
(b) Remove slotted nut (180).
(c) Remove washer (190).
(d) Remove bolt (200) and disengage clevis (150) from VBV feedback reverser arm (60). The arm (60) is on the Rotary Variable Differential Transducer (RVDT).
(3) Remove the 2 bracket screws (70) securing bleed valve and master ballscrew actuator (40) to fan frame (9 o'clock strut).
(4) Loosen the 4 main captive bolts (130 and 210) (upper horizontal and lower vertical) attaching bleed valve and master ballscrew actuator (40) to fan frame.
(5) Disengage the flexible shaft
CAUTION:
TAKE CARE NOT TO DAMAGE THE PROTECTIVE BOOT ON THE STOP MECHANISM.
(a) Remove screw (240) and loosen bolt (220) to rotate cover (230), to get access to the hexagonal end of the main flexible shaft. (b) Disengage hexagonal end of main flexible shaft (80) by pushing it into the bleed valve stop mechanism (140) and bleed valve fuel gear motor assembly (10) using an ALLEN KEY - DRIVER 2 MM (5/64 IN) across flats.
(6) Remove bleed valve and master ballscrew actuator (40).