2. Prepare for Removal
A. Remove rudder systems A, B, and standby hydraulic power (AMM 27-21-0/201).
B. Install rigging pin R-5 in feel and centering unit output crank. Refer to Rudder Control Torque Tube - A/T for location.
C. Remove access panels (Fig. 401).
3. Remove Rudder Control Torque Tube
A. Disconnect standby input rod, vernier control rod, aft quadrant control rod, and trim and feel rod from respective cranks on rudder control torque tube by removing nuts, washers, and bolts (Fig. 401).
B. Mark relative positions of lower crank, center crank, and upper crank to installed location on rudder control torque tube.
C. Remove nuts, washers, and bolts securing lower crank to torque tube.
D. Remove nuts, washers, and bolts securing center crank to torque tube.
E. Remove nuts, washers, and bolts securing upper crank to torque tube.
F. Cut lockwire and remove bolts and washers securing upper bearing housing to structure.
G. Separate lower bearing housing from structure by removing nuts, washers, and bolts.
May 01/03 27-21-72 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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Rudder Control Torque Tube 501
27-21-72 Figure 401 Aug 15/69
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
H. Slide lower bearing housing downward and remove from torque tube.
I. Pull torque tube downward and remove upper bearing housing.
J. Separate torque tube from cranks and remove torque tube and cranks from airplane.
4. Prepare for Installation
A. Remove rudder systems A, B, and standby hydraulic power. Refer to 27-21-0.
B. Check that rigging pin R-5 is installed in feel and centering unit output crank.
C. Check rudder control torque tube for allowable wear. Refer to Rudder Control Torque Tube -Inspection/Check.
5. Install Rudder Control Torque Tube
A. Feed torque tube through structural cutouts and place upper bearing housing, upper crank, and center crank on torque tube. (See figure 401.)
B. Slide lower bearing housing onto torque tube and secure to structure using bolts, washers and nuts.
C. Secure upper bearing housing with washers and bolts. Lockwire bolt heads.
D. Install lower crank on torque tube.
E. Apply coating of corrosion preventive compound to bolts. Install bolts, washers, and nuts to secure lower crank to torque tube. Tighten nuts to 12-15 pound-inches.
F. Apply coating of corrosion preventive compound to center crank bolts. Install bolts, washers, and nuts to secure center crank to torque tube. Tighten nuts to 25-35 pound-inches.
G. Apply coating of corrosion preventive compound to upper crank bolts. Install bolts, washers, and nuts to secure upper crank to torque tube. Tighten nuts to 25-35 pound-inches.
H. Ensure torque tube rotates without binding and/or vertical/horizontal free play.
NOTE: If binding or free play exists, recheck the installation of the upper and lower bearing housings.
501
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-21-72 Page 403
I. Connect standby input rod and aft quadrant control rod to their respective cranks by installing bolts, washers, and nuts.
J. Connect trim and feel rod to lower crank by installing bolts, washers and nuts. Tighten large nut to 50-60 pound-inches. Tighten small nut to 12-15 pound-inches.
CAUTION: AFTER TIGHTENING SMALL NUT DO NOT ATTEMPT TO RESET LARGE NUT TORQUE.
K. Connect vernier control rod to center crank by installing bolts, washers and nuts. Tighten large nut to 50-65 pound-inches. Tighten small nut to 12-15 pound-inches.
CAUTION: AFTER TIGHTENING SMALL NUT DO NOT ATTEMPT TO RESET LARGE NUT TORQUE.
L. 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 flush with the surrounding structure.
M. Restore airplane to normal hydraulic configuration (Ref 27-21-0).
N. Adjust system per Rudder Control Torque Tube - A/T.
501
27-21-72 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 01/94
RUDDER CONTROL TORQUE TUBE - ADJUSTMENT/TEST
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