(3) Make sure that the access platform is in position.
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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 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 461AL, 462AR
Subtask 75-31-50-040-051
C. Make sure that the thrust reverser is unserviceable (Ref. TASK 78-30-00-481-041).
4. Procedure
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(Ref. Fig. 401/TASK 75-31-50-991-300, 402/TASK 75-31-50-991-301)
Subtask 75-31-50-720-053
A. Prepare the installation of the Bleed Valve and Master Ballscrew as
follows:
(1) Clean the component interface and/or the adjacent area.
(2) Do a visual inspection of the component interface and/or the adjacent area.
(3) Make sure that the translating nut of the bleed valve and master ballscrew actuator can move without binding.
(4) Set the bleed valve near the closed position.
(5) Make sure that the retaining nuts on the captive bolts (40) and (50) are in the correct position. If not, adjust with WRENCH - VBV BALLSCREW ACTUATOR (856A3114G01).
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(6) Make sure that the VBV stop mechanism is in the CLOSED stop position as follows.
CAUTION : TAKE CARE NOT TO DAMAGE THE PROTECTIVE BOOT ON THE STOP_______ MECHANISM.
R R (a) Turn the main flexible shaft (10) fully counterclockwise (aft looking forward) engaged in the VBV stop mechanism (90).
Subtask 75-31-50-420-051
B. Install the bleed valve and master ballscrew actuator (30).
R R R (1) Push the main flexible shaft (10) into the bleed valve stop mechanism (90) and hold it that way. Make sure the spring is present on the main flexible shaft.
(a) Visually check for the presence of the silicone rubber plug, (replace the bleed valve and master ballscrew if missing).
(b) Put the actuator (30) in its correct attitude and position and release the main flexible shaft (10) so that it comes fully against the mating faces of the master ballscrew actuator (30) and of the bleed valve stop mechanism (90).
R R (2) Make sure of the correct position of the main flexible shaft in its housing before continuing the installation of the master ballscrew actuator.
R R R (3) Tighten the screws (70) which attach the bleed valve and master ballscrew actuator to the 9 o'clock fan frame strut (aft looking forward) by hand.
NOTE : Do not lubricate the threads of the bolts.____
R R (4) Tighten the horizontal captive bolts (50) then the vertical captive bolts (40) by hand.
(5) Make sure that the master VBV door engages in the fan frame. If not, do the steps below:
(a) Push the hexagonal end of the main flexible shaft in the stop mechanism (90), and disengage it. Use an hexagonal head wrench, 5/64 in. across flats.
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(b) With the WRENCH - VBV MANUAL CONTROL (856A2501G01) turn the control drive of the bleed valve and master ballscrew actuator
(30) to move the VBV door as necessary. Make sure that the door is correctly adjusted in its fan frame seat.
(6) TORQUE the two screws (70) to between 25 and 35 lbf.in (0.28 and 0.39 m.daN).
(7) TORQUE the two upper horizontal bolts (50) then the two lower vertical bolts (40) to between 105 and 115 lbf.in (1.18 and 1.29 m.daN).
(8) Set the VBV door to the reference CLOSED position as follows:
(a) Disengage the hexagonal end of the main flexible shaft (10) while R you push it into the VBV stop mechanism (90) with an hexagonal R head wrench, 5/64 in. across flats.
(b) Adjust the reference CLOSED position of the door (Ref. TASK 75-31-00-820-001).
(9) Engage the main flexible shaft (10) again in its housing.
(10) Attach the access cover (160) with screw (170). Tighten bolt (150) and screw (170).
(11) Engage the hexagonal end (spring side) of each flexible shaft (20) in the applicable actuator assembly, through the fan frame struts.
(12) Compress the spring and engage the opposite end of the flexible shaft
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