Removal of the Variable Bleed Valve position Sensor [CFMB]

TASK 75-31-70-000-002-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-B	Opening of the Fan Cowl Doors
TASK 75-31-20-820-001-A	Set the Variable Bleed Valve Assembly to the Closed position
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
Variable Bleed Valve (VBV) Feedback Sensor - PRE SB CFM 75-006
VBV Feedback Sensor - POST SB CFM 75-006

3. Job Set-up
Subtask 75-31-70-941-051-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 75-31-70-010-053-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-70-040-052-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-70-010-054-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 75-31-70-820-051-A ** ON A/C NOT FOR ALL

A. Make sure the two reference marks are in line. If not, set the VBV system to closed position (Ref. AMM TASK 75-31-20-820-001).

Subtask 75-31-70-020-051-A ** ON A/C NOT FOR ALL

B. Disconnect the 2 electrical cables

PRE SB CFM 75-006

Variable Bleed Valve (VBV) Feedback Sensor - PRE SB CFM 75-006 ** ON A/C NOT FOR ALL

POST SB CFM 75-006

VBV Feedback Sensor - POST SB CFM 75-006 ** ON A/C NOT FOR ALL

END OF SB CFM 75-006

(1) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(2) Remove the nut (30) and the pin (60) which secures the feedback rod clevis (20) to VBV sensor arm.

NOTE: Do not loosen nut (10) securing clevis (20) to feedback rod.

PRE SB CFM 75-006

(3) Remove the 3 bolts (50) which secure the VBV sensor (40) to stop mechanism and remove the sensor.

POST SB CFM 75-006

(4) Remove the 3 bolts (50) and (55) which secure the VBV sensor (40) to stop mechanism and remove the sensor.

END OF SB CFM 75-006

[Rev.10 from 2021] 2026.04.01 13:08:33 UTC