(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 is in position to tell persons not to energize the FADEC 1(2).
Subtask 75-31-20-010-064
B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. TASK 71-13-00-010-040): FOR 1000EM1 437AL, 438AR FOR 1000EM2
R 447AL, 448AR.
(2) Make sure that the thrust reverser doors are open (Ref. TASK 78-36-00-010-040): FOR 1000EM1 451AL, 452AR FOR 1000EM2
R 461AL, 462AR.
Subtask 75-31-20-040-052
C. Make sure that the thrust reverser is 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 75-31-20-010-057
A. Remove the fan duct panels (Ref. TASK 72-23-00-000-027).
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Subtask 75-31-20-420-051
B. Installation of the Variable Bleed Valve (VBV) stop mechanism
(1) Assemble the stop mechanism (210) and the bleed valve fuel gear motor
(40) as follows:
CAUTION : KEEP THE MOTOR PERPENDICULAR TO THE MOUNTING SURFACE TO
_______ PREVENT DAMAGE TO THE SPLINES, WHEN YOU INSTALL THE BLEED VALVE FUEL GEAR MOTOR ON THE BLEED VALVE STOP MECHANISM.
(a) Lubricate a new O-ring (200) with engine oil (Material No. CP2442) and install it in the groove of the fuel gear motor housing.
(b) Engage the fuel gear motor (40) in the bleed valve stop mechanism
(210). Align the 4 attachment holes of the fuel gear motor with R those on the stop mechanism mounting baseplate. Make sure that R the O-ring (200) remains correctly installed in its groove.
(c) Lubricate the 4 bolts (100) with graphite grease (Material No. CP2101) and install them with washers (110). Hand-tighten bolts (100).
(d) TORQUE the 4 bolts (100) to between 110 and 120 lbf.in (1.24 and
1.35 m.daN).
(2) Install the bleed valve fuel gear motor and stop mechanism assembly on the (rear surface) of fan frame as follows:
R CAUTION : BE CAREFUL NOT TO CAUSE DAMAGE TO THE PROTECTING BOOT (PRE
_______ R CFM SB 75-0010) ON THE BLEED-VALVE FUEL GEAR MOTOR ASSEMBLY R DURING INSTALLATION. ONLY BLEED VALVE STOP MECHANISM WHICH R INCLUDES PACKED SEALED BEARINGS, HAS NOT A PROTECTING BOOT R (POST CFM SB 75-0010).
(a) Make sure the stop mechanism is at its mechanical CLOSED stop position. If not, do this: (Ref. Fig. 402/TASK 75-31-20-991-301)
1 Engage the main flexible shaft (the end with the helical
_
spring, first) in the stop mechanism (210) but not deep enough R to drive the gears of the fuel gear motor in rotation. Make R sure the spring is present on the main flexible shaft.
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E 56-5B E E E 2 Turn the main flexible shaft CLOCKWISE, as shown by the arrow
_ on the aft mounting baseplate of the stop mechanism (210).
NOTE : As you turn the main flexible shaft, you drive a torque
____ shaft which moves a follower nut in translation inside the stop mechanism.
3 When you feel you can no longer turn the main flexible shaft
_ CLOCKWISE, the follower nut is against the CLOSED mechanical stop. This state relates to the reference CLOSED position of the VBV system.
(b) Make sure all the variable bleed valves are in the reference CLOSED position. If not, adjust the reference CLOSED position of the VBV doors (Ref. TASK 75-31-00-820-001).
(c) Engage the bleed valve stop mechanism in the fan frame cavity. Align the attachment holes (of its fan frame-facing baseplate) with those in the fan frame. Engage the hexagonal end of the main flexible shaft in the hex drive of the bleed valve and master ballscrew actuator.
NOTE : A slight rotation of the main flexible shaft (Clockwise
____ (CW) or Counterclockwise (CCW)) may be necessary to get the correct engagement of the main flexible shaft in the hex drive of bleed valve and master ballscrew actuator.
(d) Lubricate the threads of the 8 bolts (190) with graphite grease (Material No. CP2101) and install them to attach the stop mechanism and fuel gear motor assembly to the fan frame.
(e) TORQUE the bolts (190) to between 110 and 120 lbf.in (1.24 and
1.35 m.daN).
(3) Connect the VBV CLOSED and the VBV OPEN shroud tubes (10) and (30) to the fuel gear motor (40) as follows. (Ref. Fig. 401/TASK 75-31-20-991-300)
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