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TASK 75-31-50-000-002
Removal of the Bleed Valve and Master Ballscrew Actuator Assembly
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific hexagonal head wrench, 5/64 in.
No specific warning notice
No specific access platform 1 m (3 ft. 3 in.)
B. Referenced Information
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REFERENCE DESIGNATION
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71-13-00-010-040 Opening of the Fan Cowl Doors
72-23-00-000-027 Removal of the Fan Duct Panels
R 75-31-20-820-001 Set the Variable Bleed Valve Assembly to the Closed
R position 75-31-30-000-001 Removal of a VBV Inter-connecting Flexible Shaft (Typical). 78-30-00-481-041 Make the Thrust Reverser Unserviceable for Maintenance 78-36-00-010-040 Opening of the Thrust Reverser Doors 75-31-50-991-300 Fig. 401 75-31-50-991-301 Fig. 402
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3. Job Set-up
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Subtask 75-31-50-941-053
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice 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 to tell persons not to energize the FADEC 1(2).
Subtask 75-31-50-010-053
B. Get Access
(1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(2) Put the access platform in position.
Subtask 75-31-50-040-050
C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
Subtask 75-31-50-010-054
D. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040)
FOR 1000EM1
451AL, 452AR
FOR 1000EM2
461AL, 462AR
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4. Procedure
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(Ref. Fig. 401/TASK 75-31-50-991-300, 402/TASK 75-31-50-991-301)
Subtask 75-31-50-010-057
A. Remove fan duct panels, from each side of the fan frame strut at 9 o'clock (aft looking forward) (Ref. TASK 72-23-00-000-027).
Subtask 75-31-50-020-051
B. Removal of the Bleed Valve and Master Ballscrew Actuator.
R (1) Set the VBV assembly to the CLOSED position (Ref. TASK 75-31-20-820-001).
(2) Remove the 2 flexible shafts (20) (Ref. 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
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MECHANISM.
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Bleed Valve and Master Ballscrew Actuator Assembly
Figure 401/TASK 75-31-50-991-300
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