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

TASK 75-31-05-000-801-A
Removal 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.

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	AR	CAP - PROTECTION
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. 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

C. 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 72-24-01-000-801-A	Removal of Segment Shrouds 1 thru 5
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
Left Variable Bleed Valve (VBV) Actuator

3. Job Set-up
Subtask 75-31-05-941-050-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) Put WARNING NOTICE(S) 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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 75-31-05-010-050-A

B. Get Access
(1) Open the fan cowl doors (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 75-31-05-040-050-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) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 75-31-05-010-051-A

D. Open the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL.

4. Procedure
Subtask 75-31-05-020-050-A

A. Removal of the Left Variable Bleed Valve (VBV) Actuator

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

(1) Remove segment shroud 5 (Ref. AMM TASK 72-24-01-000-801).
(2) Remove hose clamp (62) that secures the VBV duct (61) to the air duct (63) and remove the VBV duct (61).
(3) Disconnect the electrical connector (53) from the left VBV actuator (51) (Ref. AMM TASK 70-70-00-910-804).
(4) Put a CONTAINER 5 L (1.32 USGAL) below the VBV-VSV fuel-hydraulic manifold (55).
(5) Remove the four bolts (54) that attach the VBV-VSV fuel-hydraulic manifold (55) to the left VBV actuator (51).
(6) Remove and discard the gasket seal (52).
(7) Remove the grounding strap bolt (59) that attaches the grounding strap (60) to left VBV actuator (51).
(8) Remove the three captive bolts (56) that attach the left VBV actuator (51) to the fan hub frame (1).
(9) Move the left VBV actuator (51) away from the fan hub frame (1) a sufficient distance to remove the bolt (57).
(10) Remove the bolt (57) that attaches the left VBV actuator (51) to the actuator turnbuckle clevis (58) and remove the left VBV actuator (51) from the engine.
(11) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and the disconnected connectors.

[Rev.10 from 2021] 2026.04.01 12:57:44 UTC