Removal of the VBV System Main Flexible Shaft [CFMB]

TASK 75-31-30-000-002-A
Removal of the VBV System Main Flexible Shaft

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 75-31-30-200-002-A	Visual Inspection of the VBV Main Flexible Shaft and the VBV Inter-connecting Flexible Shafts
TASK 75-31-50-000-002-A	Removal of the Bleed Valve and Master Ballscrew Actuator Assembly
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 System Main Flexible Shaft

3. Job Set-up
Subtask 75-31-30-941-053-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 75-31-30-010-057-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 75-31-30-040-056-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-30-010-060-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 75-31-30-020-053-A ** ON A/C NOT FOR ALL

A. Removal of the VBV system main flexible shaft

CAUTION: BE CAREFUL NOT TO CAUSE DAMAGE TO THE PROTECTING BOOT (PRE CFM SB 75-0010) ON THE STOP MECHANISM. ONLY THE BLEED VALVE STOP MECHANISM WHICH INCLUDES PACKED SEALED BEARINGS DOES NOT HAVE A PROTECTING BOOT (POST CFM SB 75-0010).

(1) Remove the bleed valve and master ballscrew actuator (Ref. AMM TASK 75-31-50-000-002).
(2) Pull the main flexible shaft out of the fuel gear motor and stop mechanism assembly, through the protective boot.
(3) 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 03:10:40 UTC