Installation of the Bleed Valve and Ballscrew Actuator Assembly [CFMB]

TASK 75-31-60-400-002-A
Installation of the Bleed Valve and Ballscrew Actuator Assembly

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	WARNING NOTICE(S)
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. 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

C. Referenced Information

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 72-23-00-400-027-A	Installation of the Fan Duct Panels
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 75-31-00-200-002-A	Manual Operation Check of the Variable Bleed Valve Doors
TASK 75-31-00-820-001-A	Adjustment of the Reference CLOSED Position of the VBV System
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
Bleed Valve and Ballscrew Actuator Assembly

3. Job Set-up
Subtask 75-31-60-860-051-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.
(4) Make sure that the bleed valve and ballscrew actuator translating nut can be actuated without binding.

Subtask 75-31-60-010-057-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 75-31-60-040-053-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 75-31-60-820-056-A ** ON A/C NOT FOR ALL

A. Set bleed valve near closed position.

Subtask 75-31-60-420-051-A ** ON A/C NOT FOR ALL

B. Install bleed valve and ballscrew actuator (20). Hand-tighten both horizontal (40), then the two vertical (30) bolts.

NOTE: Do not lubricate the threaded part of the bolts.

Subtask 75-31-60-820-051-A ** ON A/C NOT FOR ALL

C. Adjustment of the Bleed Valve and Ballscrew Actuator
(1) Make sure that Variable Bleed Valve (VBV) door engages in the fan frame. If it does not, turn the control drive of the bleed valve and ballscrew actuator (20) with the 856A2501 WRENCH-VBV MANUAL CONTROL (856A2501G01) to move the VBV door. Make sure of the correct adjustment of the door in its fan frame seat.
(2) TORQUE the horizontal (40), then the vertical (30) bolts to between 115 and 105 lbf.in (1.30 and 1.19 m.daN )

.
(3) Set the VBV door reference CLOSED position (Ref. AMM TASK 75-31-00-820-001).

Subtask 75-31-60-420-053-A ** ON A/C NOT FOR ALL

D. Installation of the Flexible Shafts
(1) Install the flexible shafts (10) in the strusts.
Engage the spring end of the flexible shafts (10) in the applicable actuator assembly. Compress the spring, and engage the opposite end in the adjacent junction box assembly.

Subtask 75-31-60-080-051-A ** ON A/C NOT FOR ALL

E. Adjustment Check of the Bleed Valve
(1) Make sure that bleed valve is still in reference CLOSED position. If not adjust the reference CLOSED position of the VBV door (Ref. AMM TASK 75-31-00-820-001).
(2) Make sure that the 11 other doors are still in the reference CLOSED position. If not adjust them (Ref. AMM TASK 75-31-00-820-001).

Subtask 75-31-60-720-053-A ** ON A/C NOT FOR ALL

F. Do a manual check of the Variable Bleed Valve doors (Ref. AMM TASK 75-31-00-200-002).

Subtask 75-31-60-410-052-A ** ON A/C NOT FOR ALL

G. Install the fan duct panels (Ref. AMM TASK 72-23-00-400-027).

Subtask 75-31-60-710-050-A ** ON A/C NOT FOR ALL

H. 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 75-31-60-410-053-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 75-31-60-440-051-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-60-410-055-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] 2026.04.01 12:59:56 UTC