Installation of the Bleed Valve and Master Ballscrew Actuator [CFMI]

TASK 75-31-50-400-001-A
Installation of the Bleed Valve and Master Ballscrew Actuator

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

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)
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 45 and 30 lbf.in (0.51 and 0.34 m.daN )
No specific	Torque wrench: range to between 55 and 50 lbf.in (0.62 and 0.57 m.daN )
No specific	Torque wrench: range to between 87 and 70 lbf.in (0.98 and 0.79 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

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
170	COTTER PIN	AIPC 75-31-50-01-010

E. Referenced Information

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 72-23-00-400-005-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 75-31-00-820-002-A	Adjustment of the Reference CLOSED Position of the Variable Bleed Valve (VBV) System
TASK 75-31-30-400-003-A	Installation of a VBV Inter-connecting Flexible Shaft (Typical)
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
Bleed Valve and Master Ballscrew Actuator Assembly
Removal/Installation of the Bleed Valve and Master Ballscrew Actuator
Fuel Gear Motor and Stop Mechanism of the Bleed Valves

3. Job Set-up
Subtask 75-31-50-860-051-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).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 75-31-50-010-061-A ** ON A/C NOT FOR ALL

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 75-31-50-040-054-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

4. Procedure
Subtask 75-31-50-720-050-A ** ON A/C NOT FOR ALL

A. Make sure that the translating nut of the bleed valve and ballscrew actuator can move freely.

Subtask 75-31-50-820-052-A ** ON A/C NOT FOR ALL

B. Precaution before installation
(1) Set bleed valve near closed position.
(2) Make sure that the bleed valve stop mechanism is in CLOSED stop position as follows:
(a) Turn counterclockwise (aft looking forward) the main flexible shaft (80) engaged in the bleed valve stop mechanism (140) and the bleed valve fuel gear motor assembly (10).

Subtask 75-31-50-420-052-A ** ON A/C NOT FOR ALL

CAUTION: TAKE CARE NOT TO DAMAGE THE PROTECTIVE BOOT ON THE STOP MECHANISM.

C. Installation of the Bleed Valve and Master Ballscrew Actuator Assembly
PRE SB CFM56-5 72-469
Not applicable
POST SB CFM56-5 72-469

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) Main flexible shaft/ferrule configuration.
Do not intermix old and new configurations of main flexible shaft/ferrule assembly.
END OF SB CFM56-5 72-469
(2) Push main flexible shaft (80) into bleed valve stop mechanism (140) and bleed valve fuel gear motor assembly (10). Make sure the spring is present onto the main flexible shaft.
(3) Visually check for the presence of the silicone rubber plug (replace the bleed valve and master ballscrew actuator if missing).
(4) Install bleed valve and master ballscrew actuator (40).
(5) Release main flexible shaft so that it comes against master ballscrew actuator (40) and bleed valve stop mechanism (140) mating face.

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.

(6) Complete master ballscrew actuator installation by engaging main flexible shaft in its housing.
(7) Hand-tighten screws (70) securing bleed valve and master ballscrew actuator to 9 o'clock strut.

NOTE: Do not lubricate threaded part of bolts.

(8) Hand-tighten horizontal bolts (210) then vertical bolts (130).

Subtask 75-31-50-820-050-A ** ON A/C NOT FOR ALL

D. Check of the Correct Position of the Variable Bleed Valve (VBV) Door
(1) Check that VBV door penetrates in fan frame. If not, perform the following :
(a) Disengage main flexible shaft hexagonal end by pushing it into the bleed valve stop mechanism/bleed valve fuel gear motor assembly. Use an ALLEN KEY - DRIVER 2 MM (5/64 IN) across flats.
(b) Rotate bleed valve and master ballscrew actuator (40) control drive (100) to move VBV door (110) using a 856A2501 WRENCH-VBV MANUAL CONTROL (856A2501G01). Check that door is correctly centered in fan frame seat.

Subtask 75-31-50-420-053-A ** ON A/C NOT FOR ALL

E. Torque the Bolts
(1) TORQUE the two screws (70) to between 35 and 25 lbf.in (0.40 and 0.28 m.daN )

.
(2) TORQUE the two upper horizontal bolts (210) to between 87 and 70 lbf.in (0.98 and 0.79 m.daN )

then the two lower vertical bolts (130) to between 115 and 105 lbf.in (1.30 and 1.19 m.daN )

Subtask 75-31-50-820-055-A ** ON A/C NOT FOR ALL

F. Adjustment of the Master Bleed Valve and Ballscrew Actuator

CAUTION: TAKE CARE NOT TO DAMAGE THE PROTECTIVE BOOT ON THE STOP MECHANISM.

(1) Disengage main flexible shaft hexagonal end by pushing it into the bleed valve stop mechanism/bleed valve fuel gear motor assembly.
Use an ALLEN KEY - DRIVER 2 MM (5/64 IN) across flats.
(2) Adjust the master bleed valve and the ballscrew actuator to the reference CLOSED position (Ref. AMM TASK 75-31-00-820-002).

Subtask 75-31-50-420-054-A ** ON A/C NOT FOR ALL

G. Installation of the Main Flexible Shaft
(1) Re-engage main flexible shaft in its housing.
(2) Close the access cover (230) as follows:
(a) Install the screw (240).
(b) TORQUE the bolt (220) to between 55 and 50 lbf.in (0.62 and 0.57 m.daN )

.
(c) TORQUE the screw (240) to between 55 and 50 lbf.in (0.62 and 0.57 m.daN )

.
(3) Install the flexible shafts (Ref. AMM TASK 75-31-30-400-003).
(4) Make sure that the other VBV doors are in the reference CLOSED position. If not, adjust the VBV doors reference CLOSED position (Ref. AMM TASK 75-31-00-820-002).

Subtask 75-31-50-420-055-A ** ON A/C NOT FOR ALL

H. Connection of the VBV
(1) Connect VBV feedback rod (50) on bleed valve and master ballscrew actuator (40) as follows :
(a) Engage clevis (160) on the feedback reverser arm (60).
(b) Apply a thin layer of graphite grease (Material No.CP2101) to the threads of the bolt (200).
(c) Install the bolt and the washer (190).
(d) TORQUE the slotted nut (180) to between 45 and 30 lbf.in (0.51 and 0.34 m.daN )

to align one slot of nut with the pin hole of bolt.

NOTE: If you cannot obey the minimum and maximum torque values, you must install a new nut.

(e) Install a new AIPC 75-31-50-01-010 COTTER PIN (170) and bend it on the two sides of the nut.
(2) Make sure that the VBV feedback sensor arm is correctly aligned with the sensor mark. If not, adjust the sensor (Ref. AMM TASK 75-31-70-400-001).

Subtask 75-31-50-720-051-A ** ON A/C NOT FOR ALL

I. Do the following test.
(1) Do a manual operation check of the VBV 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).

5. Close-up
Subtask 75-31-50-410-051-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) Install the fan duct panels (Ref. AMM TASK 72-23-00-400-005).
(3) 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 75-31-50-440-052-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 75-31-50-410-059-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:36:56 UTC