Installation of the VBV System Main Flexible Shaft [CFMB]

TASK 75-31-30-400-002-A
Installation 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 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 73-29-00-710-040-B	Operational Test of the FADEC on the Ground (with Engine Motoring)
TASK 73-29-00-710-040-B-02	Operational Test of the FADEC on the Ground (with Engine Non motoring)
TASK 75-31-00-200-002-A	Manual Operation Check of the Variable Bleed Valve Doors
TASK 75-31-50-400-002-A	Installation of the Bleed Valve and Master Ballscrew Actuator Assembly
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
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
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
VBV System Main Flexible Shaft

3. Job Set-up
Subtask 75-31-30-860-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 75-31-30-010-061-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 75-31-30-040-057-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 75-31-30-420-053-A ** ON A/C NOT FOR ALL

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).

A. Installation of the Variable Bleed Valve (VBV) system main flexible shaft

PRE CFM SB 72-0119

Not applicable

END OF PRE CFM SB 72-0119

POST CFM SB 72-0119

(1) Flexible shaft/ferrule configuration

CAUTION: THE INNER DIAMETER OF THE NEW FERRULE HAS BEEN INCREASED AS THE HEXAGONAL END OF THE NEW MAIN FLEXIBLE SHAFT HAS BEEN ENLARGED.

(a) Do not mix old and new configurations of flexible shaft/ferrule assembly.

END OF POST CFM SB 72-0119

(2) Install the main flexible shaft in the fuel gear motor and stop mechanism assembly.
(a) Engage the splined end (spring side) of the main flexible shaft in the fuel gear motor and stop mechanism assembly, through the protecting boot of stop mechanism.

NOTE: POST CFM SB75-0010, the stop mechanism does not have a protecting boot.

(b) Make sure that the spring is present on the main flexible shaft.
(3) Make sure that the main flexible shaft is correctly engaged.
(4) Install the bleed valve and master ballscrew actuator (Ref. AMM TASK 75-31-50-400-002).
(5) Do a manual operation check of the Variable Bleed Valve doors (Ref. AMM TASK 75-31-00-200-002).
(6) Do an operational test of the FADEC on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).

5. Close-up
Subtask 75-31-30-410-055-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the access platform(s).

Subtask 75-31-30-440-053-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 75-31-30-410-057-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

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