Removal of the Bleed Valve and Master Ballscrew Actuator Assembly [CFMB]

TASK 75-31-50-000-002-A
Removal of the Bleed Valve and Master Ballscrew Actuator Assembly

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)
No specific	AR	WRENCH 5/64 IN - HEXAGONAL

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 75-31-30-000-001-A	Removal of a VBV Inter-connecting Flexible Shaft (Typical).
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
Bleed Valve and Master Ballscrew Actuator Assembly
Disconnection of Feedback Rod and Disengagement of Main Flexible Shaft

3. Job Set-up
Subtask 75-31-50-941-053-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 75-31-50-010-053-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 75-31-50-040-050-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-50-010-054-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 75-31-50-010-057-A ** ON A/C NOT FOR ALL

A. Remove fan duct panels, from each side of the fan frame strut at 9 o'clock (aft looking forward) (Ref. AMM TASK 72-23-00-000-027).

Subtask 75-31-50-020-051-A ** ON A/C NOT FOR ALL

B. Removal of the Bleed Valve and Master Ballscrew Actuator.
(1) Set the Variable Bleed Valve (VBV) assembly to the CLOSED position (Ref. AMM TASK 75-31-20-820-001).
(2) Remove the 2 flexible shafts (20) (Ref. AMM TASK 75-31-30-000-001).
(3) Disconnect the feedback rod (80) from the bleed valve and master ballscrew actuator (30) as follows :
(a) Remove and discard cotter pin (120).
(b) Remove castellated nut (130).
(c) Remove washer (140).
(d) Remove bolt (100) and disengage clevis (110) of feedback rod (80) from VBV feedback reverser arm (60).
(4) Remove the 2 bracket screws (70) securing bleed valve and master ballscrew actuator (30) to fan frame.
(5) Loosen the 4 main captive bolts (40 and 50) (upper horizontal and lower vertical) attaching bleed valve and master ballscrew actuator (30) to fan frame.
(6) Remove screw (170). Loosen bolt (150). Rotate cover (160) to get access to the hex end of main flexible shaft (10).
(7) Disengage the hexagonal end of the main flex shaft.

CAUTION: TAKE CARE NOT TO DAMAGE THE PROTECTIVE BOOT ON THE STOP MECHANISM.

(a) Disengage the hexagonal end of the main flex shaft (10), while you push it back in the VBV stop mechanism (90) with a WRENCH 5/64 IN - HEXAGONAL across flats.
(8) Remove bleed valve and master ballscrew actuator (30).

[Rev.10 from 2021] 2026.04.01 03:10:44 UTC