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F.  Install the cover assembly over the trim control wheel and secure with screws unless the control cables have yet to be installed.
2.  To install the trim control cables:
A.  Draw the cables through the floor tunnel and route them through the pulley clusters at station
127.175 and 85.0.
B.  Wrap the cable drum and install the trim control wheel as given in Step 1.
C.  Position the cables over the proper pulleys.
D.  Connect the forward cables to the aft cables at the turnbuckles in the aft section of the fuselage. If aft cable is not installed, proceed with instructions given in Paragraph titled Installation of Aft Rudder Trim Controls.
E.  Remove the blocks securing the aft cables and check that the cables are seated on the pulleys. Install the guard plates/pins at the pulley clusters.
F.  Set trim cable tension in accordance with specifications given in Figure 27-14 and check rigging and adjustment. Safety both turnbuckles.
G.  Install the tunnel cover on the forward tunnel and secure with screws.
H.  Install the carpet over the floor tunnel.
I.  Install the cover assembly over the trim control wheels and flap handle and secure with screws.
J.  Install the seat belts removed from the top of the floor tunnel and secure with bolt, washer and nut.
K.  Install the aft floor tunnel cover, heater duct and carpet.
L.  Install the carpet over the aft floor plate.
3.  Install the panel to the aft section of the fuselage and the seats.
REMOVAL OF AFT RUDDER TRIM CONTROLS. (Refer to Figure 27-16.)
1.  
If the forward trim mechanism is not being removed, block the cables forward of the turnbuckles to prevent the cables from unwrapping at the forward trim drum. (Refer to Figures 27-16 and 27-21.)

2.  
Secure the trim cables at the aft trim drum barrel.

27-20-00 Page 27-35 Issued: April 1, 1997
1.
TRIM SCREW

2.
PUSH ROD

3.
PULLEY CLUSTER

4.
TURNBUCKLES

5.
PULLEY CLUSTER

6.
PULLEY CLUSTER

7.
RUDDER TRIM CONTROL

Figure 27-16. Rudder Trim Controls 
27-20-00 
Page 27-36 
Issued: April 1, 1997 
2C12 

3.  
Disconnect the trim cable turnbuckles in the aft section of the fuselage.

4.  
Remove the cable guards from the pulley bracket located at station 273.38.

5.  
Disconnect the trim screw link assembly from the screw.

6.  
Remove the cotter pin from the aft end of the screw.

7.  
Remove the two bolt assemblies securing the forward support to the mounting bracket.

8.  
Remove the screw and barrel assembly along with the aft cables from the airplane.

INSTALLATION OF AFT RUDDER TRIM CONTROLS. (Refer to Figure 27-16.)
1.  
Insert the complete trim screw and barrel assembly into the fin. Route the trim cable ends around the pulleys at station 273.38.

2.  
Insert the trim screw and barrel assembly into the mounting bracket. Place the washer on the forward end of the barrel and install the support assembly in the mounting bracket.

3.  
Install the cotter pin in the aft end of the shaft.

4.  
Adjust the screw assembly to obtain the neutral position. (Refer Figure 27-16.)

5.  
Connect the link assembly to the trim screw.

6.  
Connect the aft trim cables to the forward cables with turnbuckles. Check to insure the cables are properly routed around the pulleys.

7.  
Install the cable guards at the pulley bracket in the fuselage at station 273.38.

8.  
Remove the clamp securing the forward trim cables and proceed to rig the system.

9.  
Lubricate the assembly per Lubrication Chart, Chapter 12.

RIGGING AND ADJUSTMENT OF RUDDER TRIM CONTROLS. (Refer to Figure 27-16.)
1.  Check that the following items have been completed before proceeding with the rigging and adjustment of the tab. If these items were accomplished during the installation, proceed with Step 2.
A.  Check that the cable is wrapped 11 turns around the barrel from each end with space at the center as shown in Figure 27-16.
B.  The control rod is adjusted to an initial length of 10.38 inches.
C.  The trim screw is at its neutral position.
D.  The cable tension is set in accordance with Figure 27-14.
E.  The nose wheel is off the ground before continuing.
2.  
Check the servo travel only by swinging the rudder until it contacts its stops. Use the rudder pedals to swing the rudder in each direction. Refer to Figure 27-14 for proper servo travel.
　
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