Removal of the Variable Bleed Valve Position Sensor [CFMI]

TASK 75-31-70-000-001-A
Removal of the Variable Bleed Valve Position Sensor

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	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)

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-A	Opening of the Fan Cowl Doors
TASK 75-31-20-820-002-A	Set the Variable Bleed Valve Assembly to the Closed Position
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
VBV Feedback Sensor - PRE SB CFM 75-045
VBV Feedback Sensor - POST SB CFM 75-045

3. Job Set-up
Subtask 75-31-70-941-050-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 75-31-70-010-050-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 75-31-70-040-051-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-70-010-051-A ** ON A/C NOT FOR ALL

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
Subtask 75-31-70-820-050-A ** ON A/C NOT FOR ALL

A. Set the VBV system to the CLOSED position (Ref. AMM TASK 75-31-20-820-002).

Subtask 75-31-70-020-050-A ** ON A/C NOT FOR ALL

B. Removal of the VBV Position Sensor:

PRE SB CFM 75-045

VBV Feedback Sensor - PRE SB CFM 75-045 ** ON A/C NOT FOR ALL

POST SB CFM 75-045

VBV Feedback Sensor - POST SB CFM 75-045 ** ON A/C NOT FOR ALL

END OF SB CFM 75-045

(1) Disconnect the 2 electrical cables.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the nut (30) and the straight-headed pin (60) which secures the feedback rod clevis to VBV sensor arm.

NOTE: Do not loosen nut (10) securing clevis (40) to feedback rod.

PRE SB CFM 75-045

(4) Remove the 3 bolts (50) which secure the VBV sensor to stop mechanism and remove the sensor.

POST SB CFM 75-045

(5) Remove the bolt (55) which secure the bonding strap to VBV sensor.
(6) Remove the 2 bolts (50) which secure the VBV sensor to stop mechanism and remove the sensor.

END OF SB CFM 75-045

[Rev.10 from 2021] 2026.04.02 07:39:57 UTC