Installation of the Left Variable Bleed Valve (VBV) Actuator [CFML]

TASK 75-31-05-400-801-A
Installation of the Left Variable Bleed Valve (VBV) Actuator

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400
FIN: 4167KS11
FIN: 4167KS12

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 87 and 73 lbf.in (0.98 and 0.82 m.daN )
No specific	Torque wrench: range to between 101.8 and 92.2 lbf.in (1.15 and 1.04 m.daN )
No specific	Torque wrench: range to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
52	GASKET SEAL	EIPC 73-00-00-20-750

E. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 72-24-01-400-801-A	Installation of Segment Shrouds 1 thru 5
TASK 73-29-00-740-802-A	Actuators Test (Menu Mode)
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Left Variable Bleed Valve (VBV) Actuator

3. Job Set-up
Subtask 75-31-05-941-052-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 75-31-05-010-054-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.

Subtask 75-31-05-040-052-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 75-31-05-010-055-A

D. Get Access
(1) Make sure that the left thrust-reverser cowl-doors is open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL.

4. Procedure
Subtask 75-31-05-420-050-A

A. Installation of the Left VBV Actuator
(1) Remove all the COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and disconnected connectors.
(2) Put the left VBV actuator (51) in position on the fan hub frame (1).
(3) Lubricate the threads of the bolts (56) and (57) with graphite grease (Material No.CP2101) .
(4) Install the bolt (57) that attaches the left VBV actuator (51) to the actuator turnbuckle clevis (58).
(5) TORQUE the bolt (57) to between 101.8 and 92.2 lbf.in (1.15 and 1.04 m.daN )

.
(6) Install the three captive bolts (56) that attach the left VBV actuator (51) to the fan hub frame (1).
(7) TORQUE the three bolts (56) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.
(8) Apply dry lubricant under the head of the bonding strap bolt (59) with Molykote G-n.
(9) Secure the bonding strap (60) to the left VBV actuator (51) with the bonding strap bolt (59).
(10) TORQUE the bonding strap bolt (59) to between 87 and 73 lbf.in (0.98 and 0.82 m.daN )

.
(11) Put the new EIPC 73-00-00-20-750 GASKET SEAL (52) between the VBV-VSV fuel-hydraulic manifold (55) and the left VBV actuator (51).
(12) Apply engine oil (Material No.CP2442) on the threads of the four bolts (54).
(13) Install the four bolts (54) that attach the VBV-VSV fuel-hydraulic manifold (55) to the left VBV actuator (51).
(14) TORQUE the four bolts (54) to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )

.
(15) Connect the electrical connector(s):

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(a) Connect the electrical connector (53) to the left VBV actuator (51) receptacle:

CAUTION: MAKE SURE THAT:

YOU DO NOT INSTALL THE ELECTRICAL HARNESS CONNECTOR UNDER STRESS, AND
THE CONNECTOR DOES NOT MOVE AFTER YOU FULLY ENGAGE IT.

IF YOU DO NOT OBEY THESE INSTRUCTIONS, FAILURE OF THE SYSTEM CAN OCCUR.

CAUTION: TIGHTEN THE ELECTRICAL HARNESS CONNECTOR UNTIL YOU CANNOT SEE THE COLOR MARK ON THE RECEPTACLE. IF YOU DO NOT OBEY THIS INSTRUCTION, FAILURE OF THE SYSTEM CAN OCCUR.

1 Tighten the coupling ring. Use the PLIERS - JAWED, SOFT if necessary (Ref. AMM TASK 70-70-00-910-804).
(16) Put the VBV duct (61) into the air duct (63) and secure with the hose clamp (62).
(17) Install segment shroud 5 (Ref. AMM TASK 72-24-01-400-801).

Subtask 75-31-05-710-050-A

B. Test
(1) Do the actuators test (menu mode) (Ref. AMM TASK 73-29-00-740-802).

5. Close-up
Subtask 75-31-05-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL.

Subtask 75-31-05-440-050-A

B. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 75-31-05-410-051-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:14:52 UTC