Removal of a VBV Inter-connecting Flexible Shaft (Typical). [CFMB]

TASK 75-31-30-000-001-A
Removal of a VBV Inter-connecting Flexible Shaft (Typical).

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)

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 72-23-00-000-027-A	Removal of the Fan Duct Panels
TASK 75-31-20-820-001-A	Set the Variable Bleed Valve Assembly to the Closed position
TASK 75-31-30-200-002-A	Visual Inspection of the VBV Main Flexible Shaft and the VBV Inter-connecting Flexible Shafts
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
VBV Inter-connecting Flexible Shaft (Typical)

3. Job Set-up
Subtask 75-31-30-941-052-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 75-31-30-010-056-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
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 75-31-30-040-054-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-30-010-058-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser cowl 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 75-31-30-020-052-A ** ON A/C NOT FOR ALL

A. Removal of a bleed valve inter-connecting flexible shaft
(1) Set the VBV system to the CLOSED position (Ref. AMM TASK 75-31-20-820-001).
(2) Remove fan duct panels, from each side of the fan frame strut related to the flexible shaft you want to remove (Ref. AMM TASK 72-23-00-000-027).
(3) Remove the flexible shafts as follows:
(a) Push the flexible shaft clockwise to compress the spring and disengage the opposite end.
(b) Remove the flexible shaft through the fan frame strut.
(c) Do the visual inspection of the VBV main flexible shaft and of the inter-connecting flexible shafts (Ref. AMM TASK 75-31-30-200-002).

[Rev.10 from 2021] 2026.04.01 13:08:30 UTC