Removal of the VBV System Main Flexible Shaft [CFMI]

TASK 75-31-30-000-004-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-A	Opening of the Fan Cowl Doors
TASK 75-31-30-200-001-A	Visual Inspection of the VBV Main Flexible Shaft and the VBV Inter-connecting Flexible Shafts
TASK 75-31-50-000-001-A	Removal of the Bleed Valve and Master Ballscrew Actuator
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
Removal/Installation of the VBV System Main Flexible Shaft

3. Job Set-up
Subtask 75-31-30-941-051-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 75-31-30-010-053-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.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 75-31-30-040-052-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-30-010-054-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 75-31-30-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the VBV system main flexible shaft

CAUTION: BE CAREFUL NOT TO DAMAGE THE PROTECTING BOOT (PRE CFM56-5 SB 75-0038) ON THE STOP MECHANISM. ONLY BLEED VALVE STOP MECHANISM WHICH INCLUDES PACKED SEALED BEARINGS, HAS NOT A PROTECTING BOOT (POST CFM56-5 SB 75-0038).

(1) Remove the bleed valve and master ballscrew actuator (Ref. AMM TASK 75-31-50-000-001).
(2) Pull the main flexible shaft out of the fuel gear motor and stop mechanism assembly, through the protecting boot for stop mechanism equipped with (PRE CFM56-5 SB 75-0038).
(3) Do the visual inspection of the VBV main flexible shaft and of the inter-connecting flexible shafts (Ref. AMM TASK 75-31-30-200-001).

[Rev.10 from 2021] 2026.04.02 06:36:55 UTC