Aft Rudder Trim Controls Installation; Rudder Trim Controls Rigging And Adjustment - Piper PA-44-180 SEMINOLE Maintenance Manual

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.
3. Adjust the servo travel by the varying the length of the control rod. Check that the initial length of the
rod was 10.38 inches.
4. Check the trim only by swinging the rudder until it contacts its stops and turning the trim control
wheel to swing the tab to its limits both left and right. Check the travel obtained with specifications
given in Figure 27-14.
5. To adjust the trim travel left:
A. Add shim washers at the forward end of the barrel to reduce the travel.
B. Remove shim washers at the forward end of the barrel to increase the travel.
6. To adjust the trim travel right:
A. Add shim washers at the aft end of the shaft to reduce the trim travel.
B. Remove shim washers at the aft end of the shaft to increase the trim travel.
7 . Check the trim and servo travels by swinging the rudder full left with full right trim and full right rudder
with full left trim.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
1L5
PPS50033
27-20-04
Page 27-27
Revised: June 20, 1995