(b) On the bottom side of the gimbal, attach the bottom flanged bushing: 1) Apply a layer of MIL-C-11796, Class 3, corrosion preventive compound to the outer surface of the flanged bushing. 2) If shims were installed with the flanged bushing when you removed it, install the
same thickness of shims on the bushing.
3) Put the flanged bushing, with the shims, on the gimbal.
NOTE: Make sure that the flanged bushing engages the journal on the ballnut.
4) Install the two bolts.
(c)
Do a check that the total clearance is .006 +.004/-.000 inch between the flanged bushings and the ballnut (Fig. 402).
(d)
If it is necessary, adjust the thickness of the shims at the flanged bushings to get the .006 +.004/-.000 inch of total clearance.
(e)
On the top and bottom sides of the gimbal, install the lockwires.
(6)
Put the drivescrew with the screw yoke and the gimbal in its installed position on the airplane.
NOTE: Make sure the oil reservoir is in its initial position (in relation to inboard or outboard).
(7)
Attach the gimbal to the fitting on the midflap:
(a) On each gimbal, attach the flanged bushing to the gimbal.
1) Install the shims with the flanged bushing that the shims were initially installed with.
NOTE: This is necessary to keep the initial lateral position adjustment of the ballscrew.
2) Apply a layer of MIL-C-11796, Class 3, corrosion preventive compound to the outer surface of the flanged bushing. 3) Put the flanged bushing, with the shims, on the fitting of the midflap.
NOTE: Make sure that the flanged bushing engages the journal on the gimbal.
4) Install the three screws with washers and nuts.
(b)
Do a check that the total clearance is .006 +.004/-.000 inch between the flanged bushings and the gimbal (Fig. 402).
(c)
If it is necessary, adjust the thickness of the shims at the flanged bushings to get the .006 +.004/-.000 inch of total clearance.
(d)
On each side of the fitting on the midflap, install the failsafe bolts.
(8)
Turn the ballnut on the screw so that the "X" dimension of the ballscrew is the same as it was at removal.
(9)
Put the upstop on the screw yoke in the same position it was at the time of removal.
NOTE: This is the initial position of the upstop on the screw yoke in relation to the output shaft. Installation of a drivescrew with the upstop on the screw yoke in this initial position will help to decrease subsequent adjustment.
(10)
At the outboard flap transmissions, assemble the universal joint:
(a)
Assemble and align the transmission output shaft, the screw yoke and the trunnion cross.
(b)
Apply a layer of BMS 3-24 grease to the cross pin, the universal joint bolt and the spacer.
CAUTION: ASSEMBLE THE UNIVERSAL JOINT CAREFULLY. IF YOU DO NOT FOLLOW THE STEPS, INTERFERENCE BETWEEN THE NUT ON THE UNIVERSAL JOINT BOLT AND THE TRANSMISSION HOUSING CAN OCCUR.
(c)
Put the cross pin through the screw yoke and the trunnion cross.
(d)
Put the universal joint bolt through the output shaft, the trunnion cross, and the cross pin.
(e)
Put the spacer on the universal joint bolt.
(f)
Clean the threads of the universal joint bolt.
(g)
Apply a layer of BMS 5-95 sealant to the threads of the universal joint bolt.
(h)
Install a new self-locking nut on the universal joint bolt.
(i)
On the No. 2 or No. 7 transmission, tighten the nut to 270-300 pound-inches.
(j)
On the No. 1 or No. 8 transmission, tighten the nut to 170-200 pound-inches.
(k)
Make sure that all the chamfer of the bolt shows when the nut is fully tightened.
500
May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-51-73 Page 411
G. Install the Drivescrew of an Inboard Flap Transmission (Fig. 403)
(1)
Turn the ballnut on the drivescrew so that "X" dimension is approximately the same as it was at removal.
(2)
Put the drivescrew together with the screw yoke in the installed position on the airplane.
CAUTION: MAKE SURE THAT THE DRIVESCREWS ARE INSTALLED ON THE CORRECT TRANSMISSIONS. A NO. 3 DRIVESCREW CAN ATTACH TO A NO. 5 TRANSMISSION, AND A NO. 4 DRIVESCREW CAN ATTACH TO A NO. 6 TRANSMISSION. THESE DRIVESCREWS ARE NOT INTERCHANGEABLE, AND CAN CAUSE OPPOSITE MOVEMENT OF THE INBOARD FLAPS. DAMAGE CAN OCCUR.
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