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1.  General
A.  The removal of the rudder trim control unit cannot be accomplished as a complete assembly. The control knob and cable drum/lower bearing housing are removed as subassemblies. The upper bearing housing, shaft and mechanical stop are removed as the last subassembly.
B.  The rudder trim knob can be removed and installed from the outside of the control stand by removing or installing three screws that secure the knob assembly at the attach plate to the control stand, after disconnecting an electrical wire from the bottom of the trim knob. The wire connection is accessible through the access panels on either side of the control stand.
2.  Equipment and Materials
A.  Rigging Pins Kit - F70207-3, -52, -61, or -84:
REF NO.  F70207-( )  DIAMETER (INCHES)  LENGTH (INCHES)  FUNCTION 
R-5  -11  0.309-0.311  6.7 +0.25  Feel and Centering Mechanism 

B.  Rudder Trim Knob Torque Adapter - SE27-2011
C.  Scale - 0 to 2 feet, graduated in inches, tenths and hundredths of an inch
3.  Prepare for Removal
A.  Place rudder trim knob in neutral position.
B.  Remove rudder systems A, B, and standby hydraulic power (Ref 27-21-0).
C.  Open ELECTRONICS PANEL LIGHTS circuit breaker C284 on load control center P6.
D.  Insert rigging pin R-5 in feel and centering mechanism (Fig. 401).
4.  Remove Rudder Trim Control Unit
A.  Remove rudder trim knob as follows:
(1)  
Remove access panels (6), Fig. 401 on left and right sides of control stand.

(2)  
Disconnect wire from electrical terminal (3).

(3)  
Remove three screws (37) securing trim knob to control stand and pull trim knob up and off end of shaft (18).

(4)  
Separate trim knob from mounting plate (36) if required, by removing three screws (38) that secure mounting plate to knob.

B.  Disconnect cables RTA and RTB at forward turnbuckles.
C.  Secure disconnected cables.
506 
Feb 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-121 Page 401 

G09180 G09200 G09233 G08566
Rudder Trim Mechanism Installation  526 
27-21-121 Page 402  Figure 402 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/69 

 

506  Rudder Trim Mechanism Installation 
Nov 15/68  Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-121 Page 403 

 

Rudder Trim Mechanism Installation  506 
27-21-121 Page 404  Figure 401 (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/68 

 

506  Rudder Trim Mechanism Installation 
Nov 15/68  Figure 401 (Sheet 4) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-121 Page 405 

D.  Remove cable guards (24) from lower bearing housing (23) by removing screws (25).
E.  Disengage cables RTA (29) and RTB (28) from cable drums (32).
F.  Remove screws (34) and washers (35) securing lower bearing housing (23) to structure (22).
G.  Remove nut (26), washers (27 and 30) and screw (31) securing cable drum (32) to tab shaft (21).
H.  Slide cable drum (32), spacer (33) and lower bearing housing (23) downward from tab shaft (21).
I.  Support lower end of tab shaft (21) and remove screws (12), nuts (12A) and washers (11) securing upper bearing housing (10) to control stand (7).
J.  Remove upper bearing housing (10), and attached components through right access panel (6).
CAUTION:  EXERCISE CAUTION IN REMOVING THIS SUBASSEMBLY TO PREVENT DAMAGE TO ELECTRICAL WIRES WITHIN CONTROL STAND.
K. Disassemble upper bearing housing (10), tab shaft (21) and related components as follows:
(1)  
Remove nut (8) and washer (9) securing upper bearing housing (10) to coupling shaft (18), and remove upper bearing housing.

(2)  
Separate retaining plate (13) from bearing housing (10) by removing screws (15) and washers (14).

(3)  
Disengage lockring (l6) and remove mechanical stop rings (17) from coupling shaft (18).

(4)  
Disengage coupling shaft (18) from tab shaft (21) by removing bolts (20) and collars (19).

5.  Prepare for Installation
A.  Remove rudder systems A, B, and standby hydraulic power (Ref 27-21-0).
B.  Check that rudder trim knob is in neutral position and that rigging pin R-5 is installed in feel and centering unit.
C.  Open ELECTRONIC PANEL LIGHTS circuit breaker C284 on load control center P6.
　
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