Removal of the Bleed Valve Stop Mechanism [CFMB]

TASK 75-31-20-000-002-A
Removal of the Bleed Valve Stop Mechanism

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	CAP - BLANKING
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP5066)	fuel system preventative

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
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 75-31-70-000-002-A	Removal of the Variable Bleed Valve position Sensor
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
Shroud Tubes Connection on VBV Fuel Gear Motor
VBV Fuel Gear Motor and Bleed Valve Stop Mechanism

3. Job Set-up
Subtask 75-31-20-941-052-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 75-31-20-010-055-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 75-31-20-040-055-A ** ON A/C NOT FOR ALL

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

Subtask 75-31-20-010-076-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 75-31-20-820-054-A ** ON A/C NOT FOR ALL

A. Set the Variable Bleed Valve (VBV) assembly to closed position (Ref. AMM TASK 75-31-20-820-001).

Subtask 75-31-20-010-056-A ** ON A/C NOT FOR ALL

B. Remove VBV feedback sensor (Ref. AMM TASK 75-31-70-000-002).

Subtask 75-31-20-020-051-A ** ON A/C NOT FOR ALL

C. Removal of the VBV Stop Mechanism
(1) Remove the bracket (140) and flexible clamp (130) from the "VBV CLOSED" end of fuel gear motor (40) as follows:
(a) Remove the 2 bolts (150) which attach the clamps (160) and (170) to the bracket (140).
Put the electrical cables CJ11L (VBV-A) and CJ12L (VBV-B) out of the way for the remaining removal. Leave the clamps (160) and (170) in place on the electrical cables.
(b) Remove nut (180) and bolt (120). Then, remove bracket (140) and flexible clamp (130) from the VBV fuel gear motor (40).
(2) Disconnect the 2 tube branches (20) of the U-shaped fuel drain manifold from the sliding sleeve (70) of VBV OPEN port tube (30) and VBV CLOSED port tube (10).

NOTE: You can loosen the 2 clamps which attach together the left-hand branch of the U-shaped drain manifold and the fuel line to the VBV fuel gear motor OPEN port. This will give some freedom of movement to the drain manifold, prevent unwanted stress, and help removal.

(3) Disconnect the VBV CLOSED and the VBV OPEN shroud tubes (10) and (30) from the gear motor (40). Do as follows for each shroud tube:

Shroud Tubes Connection on VBV Fuel Gear Motor ** ON A/C NOT FOR ALL

(a) Cut and remove the lockwire which safeties together the (round and knurled) outer coupling nuts (60).
Fully loosen outer nut (60). This releases the sliding sleeve (70).
(b) Move the sliding sleeve (70) and coupling nut (60) downward. This gives access to the inner connecting nut (90).
(4) Loosen the coupling nuts:

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

(a) Place a CONTAINER 5 L (1.32 USGAL) under the fuel gear motor to collect the fuel drainage. Cut the lockwire which safeties the connecting nut (90) to the gear motor nipple. Fully loosen connecting nut (90).
(b) Remove O-ring (50) from sliding sleeve (70). Move sleeve (70) fully downward and remove O-ring (80). Discard O-rings (50) and (80).
(5) Remove the bleed valve fuel gear motor (40) and the VBV stop mechanism (210), as a complete assembly, as follows:

VBV Fuel Gear Motor and Bleed Valve Stop Mechanism ** ON A/C NOT FOR ALL

CAUTION: BE CAREFUL NOT TO DAMAGE THE PROTECTING BOOT (PRE CFM SB 75-0010) AT THE FORWARD END OF THE BLEED VALVE FUEL GEAR MOTOR ASSEMBLY DURING REMOVAL. ONLY BLEED VALVE STOP MECHANISM WHICH INCLUDES PACKED SEALED BEARINGS, HAS NOT A PROTECTING BOOT (POST CFM SB 75-0010).

(a) Fully loosen the 8 bolts (190) which attach the assembly to the rear surface of fan frame.
(b) Carefully move back the assembly, together with the VBV main flexible shaft, and remove from the fan frame.
(c) Remove the VBV main flexible shaft from the stop mechanism (210).
(d) 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).
(6) Remove the stop mechanism (210) from the bleed valve fuel gear motor (40) as follows:

(a) Remove the 4 bolts (100) and washers (110) which attach the fuel gear motor (40) to the base plate of stop mechanism (210). Move the two items (40) and (210) apart to complete the removal of stop mechanism (210).

VBV Fuel Gear Motor and Bleed Valve Stop Mechanism ** ON A/C NOT FOR ALL

(b) Remove the O-ring (200) from bleed valve fuel gear motor mounting diameter and discard the O-ring (200).

Subtask 75-31-20-620-051-A ** ON A/C NOT FOR ALL

D. Preserve bleed valve fuel gear motor as follows :
(1) Introduce fuel system preventative (Material No.CP5066) into one port of the motor.
(2) Turn the motor shaft until fluid flows from opposite port.
(3) Install PLUG - BLANKING on orifices.

NOTE: Never insert plugs into orifices.

(4) Put the PLUG-BLANKING in each disconnected line end.
(5) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

[Rev.10 from 2021] 2026.04.01 13:08:31 UTC