Rudder Trim Controls; Removal Of Rudder Trim Assembly; Installation Of Rudder Trim Assembly - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
d.
To adjust the interconnecting cables between the aileron and rudder cables, first ascertain that
the cable tension has been set for both the aileron and rudder cables. Ascertain that the aileron and rudder
controls and surfaces are neutral and adjust the interconnecting cable turnbuckles (10) at station 288.0 so
that the spring (12) will extend .060 of an inch.
e. Safety turnbuckles and install access plates, panels, and seats.
5-46. RUDDER TRIM CONTROLS.
5-47. REMOVAL OF RUDDER TRIM ASSEMBLY. (Control Pedestal) (Refer to Figure 5-10.)
a. Remove the right pilot's seat and right row of passenger seats.
b.
Remove the lower cover from the face of the control pedestal.
c. Remove the floor panel located aft of the control pedestal, the right panel forward of the main
spar, the first and second panels aft of the main spar and the panel lateral to the entrance door.
d.
Remove the interior access panel to the aft section of the fuselage.
e. Block the forward trim cables at the trim screw assembly within the lower section of the control
pedestal and the aft cables at bulkhead 317.75, to prevent the cables from unwrapping from their drums,
by one of the methods shown in Figure 5-8. (If the aft screw assembly is also to be removed, then remove
the access plate attached to the right side of the vertical fin and block the cables at the screw assembly
instead of in the fuselage.)
f. Mark one set of cable ends at station 287.5 to facilitate installation and disconnect the cables (16
and 20) at the turnbuckles (18).
g.
Remove the cable guard pin at fuselage stations 123.5 and 243.5.
h. Remove one screw from each set of rub blocks (19) at stations 162.5, 174.0 and 215.0 and open
them far enough to allow the cable ends to pass through.
i. Remove the roll pin that secures the flexible joint to the control shaft of the trim screw
assembly.
j. Remove the bolts that attach the screw assembly to its mounting bracket. Draw the assembly
with cables from the control pedestal.
5-48. INSTALLATION OF RUDDER TRIM ASSEMBLY. (Control Pedestal) (Refer to Figure 5-10.)
a. Ascertain that the cable is evenly wrapped on the trim drum (centered) and blocked to prevent
unwrapping. (Refer to Wrapping the Trim Drum, Paragraph 5-55.)
b. Insert the trim screw shaft in the end of the swivel joint and position the assembly on its
mounting bracket. Install attachment bolts and secure.
c. Draw the cables (20) from the pedestal through the fuselage to the aft section of the fuselage.
d. If the trim cables (16) from the rudder are installed, connect the cable ends. (If the cables from
the rudder are not installed, pull the cables tight and block them in the fuselage at bulkhead 244.0.)
e. With the cable installed and connected, install the cable guard pin at stations 123.5 and 243.5
and close and secure the rub blocks (19) at stations 162.5, 174.0 and 215.0.
f.
Remove the cable blocks.
g. Set cable tension with the turnbuckles (18) at station 287.5 per Table V-I and check rigging and
adjustment per Paragraphs 5-53 and 5-54.
h.
Install cover on face of control pedestal, access plates and panels, and seats.
Reissued: 10/12/79
SURFACE CONTROLS
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