W28066
Rudder Control Torque Tube 500
27-21-73 Figure 401 May 01/03
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Prepare for Installation
A. Remove rudder systems A, B, and standby hydraulic power (AMM 27-21-0/201).
B. If you are installing a new torque tube, then do the following step:
(1)
Use a marker or pen to make marks to identify the installed positions of the center cranks and upper crank on the torque tube.
(2)
Remove the nuts, washers, and bolts that attach the upper crank to the torque tube
(3)
Remove the nuts, washers, and bolts that attach the center cranks to the torque tube.
(4)
Keep the lower crank installed on the torque tube.
6. Torque Tube Installation (Fig. 401)
A. Make sure that the plate, lower bearing housing, retainer, and plate are in their positions on torque tube.
NOTE: Align holes in the plate, lower bearing housing, retainer, and plate before installing the torque tube.
B. Put the torque tube through the structural cutouts, center cranks, upper crank, and upper bearing housing.
NOTE: Put the center cranks and upper crank in their positions before you put the torque tube through the structural cutouts.
C. Install the bolts, washers, and nuts to attach the lower bearing housing to the airplane structure.
D. Install the center cranks on the torque tube at the marked positions:
(a)
Install the bolts, washers, and nuts to attach the center cranks to the torque tube.
NOTE: The upper bolt on the crank is slightly longer than the lower bolt on the same crank.
(b)
Tighten the nuts to 15-25 pound-inches (1.69-2.82 newton-meters) above the run-on torque.
E. Install the upper crank on the torque tube at the marked position:
(a)
Install the bolts, washers, and nuts to attach the upper crank to the torque tube.
NOTE: The upper bolt on the crank is slightly longer than the lower bolt on the same crank.
(b)
Tighten the nuts to 15-25 pound-inches (1.69-2.82 newton-meters) above the run-on torque.
500
May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-21-73 Page 403
F. Make sure the torque tube turns freely and that there is no play in the horizontal and vertical directions.
(1) If the torque tube does not turn freely, do a check of the lower bearing housing and upper bearing housing installation.
G. Install the bolt, washer (under the bolt), washer (under the nut), and nut to connect the control rod of the standby PCU to the upper crank.
H. Install the bolts, washers (under the bolts), washers (under the nuts), and nuts to connect the control rods of the main PCU to the center cranks.
I. Install the bolt assemblies, washers, and nuts to connect the aft quadrant control rod and the trim and feel rod to the lower crank.
(1)
Tighten the large nuts to 50-65 pound-inches (5.65-7.34 newton-meters).
NOTE: Do not tighten the large nut after you tighten the small nut. Movement of the large nut can cause the small nut to come loose.
(2)
Tighten the small nuts to 12-15 pound-inches (1.36-1.69 newton-meters).
J. Apply grease to the top of both the upper and lower torque tube bearings.
(1) Fill the upper and lower bearing housings until the grease is aligned with the surrounding structure.
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