(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 75-31-20-010-055
B. Open the fan cowl doors (Ref. TASK 71-13-00-010-040):
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
R 447AL, 448AR.
Subtask 75-31-20-040-055
C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
4. Procedure
_________ (Ref. Fig. 401/TASK 75-31-20-991-300, 402/TASK 75-31-20-991-301) Subtask 75-31-20-820-054 R A. Set the Variable Bleed Valve (VBV) assembly to closed position (Ref. TASK 75-31-20-820-001). Subtask 75-31-20-010-056
B. Remove VBV feedback sensor (Ref. TASK 75-31-70-000-002).
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Shroud Tubes Connection on VBV Fuel Gear Motor
Figure 401/TASK 75-31-20-991-300
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R VBV Fuel Gear Motor and Bleed Valve Stop Mechanism Figure 402/TASK 75-31-20-991-301- 12 (SHEET 1)
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R VBV Fuel Gear Motor and Bleed Valve Stop Mechanism Figure 402/TASK 75-31-20-991-301- 22 (SHEET 2)
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Subtask 75-31-20-020-051
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). R Put the electrical cables CJ11L (VBV-A) and CJ12L (VBV-B) out of R the way for the remaining removal. Leave the clamps (160) and R (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
R 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: (Ref. Fig. 401/TASK 75-31-20-991-300)
(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).
R (b) Move the sliding sleeve (70) and coupling nut (60) downward. This R gives access to the inner connecting nut (90).
(4) Loosen the coupling nuts:
CAUTION : USE 2 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 WILL PREVENT DAMAGE TO THE HARDWARE.
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R (a) Place a container 1USgal (4l) under the fuel gear motor to
R collect the fuel drainage. Cut the lockwire which safeties the connecting nut (90) to the gear motor nipple. Fully loosen connecting nut (90).
R (b) Remove O-ring (50) from sliding sleeve (70). Move sleeve (70) R 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: (Ref. Fig. 402/TASK 75-31-20-991-301)
R CAUTION : BE CAREFUL NOT TO DAMAGE THE PROTECTING BOOT (PRE CFM SB
_______ R 75-0010) AT THE FORWARD END OF THE BLEED VALVE FUEL GEAR R MOTOR ASSEMBLY DURING REMOVAL. ONLY BLEED VALVE STOP R MECHANISM WHICH INCLUDES PACKED SEALED BEARINGS, HAS NOT A R 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).
(6) Remove the stop mechanism (210) from the bleed valve fuel gear motor
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