Removal Of Rudder Trim Assembly (Rudder); Installation Of Rudder Trim Assembly (Rudder); Removal Of Rudder Trim Sender Assembly - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
5-49. REMOVAL OF RUDDER TRIM ASSEMBLY. (Rudder) (Refer to Figure 5-10.)
a. Remove the interior access panel to the aft section of the fuselage.
b. Remove the access plates located on the right side of the fuselage under the horizontal stabilizer
and on the right side of the vertical fin.
c.
Block the trim cables to prevent them from unwrapping at the screw assembly within the vertical
fin and within the fuselage at the bulkhead at station 244.0 by one of the methods shown in Figure 5-8. (If
the trim assembly within the fuselage is also to be removed, then block the cables at the trim screw
assembly in the control pedestal.)
d.
Mark one set of cable ends within the fuselage at station 287.5 to facilitate installation and
disconnect the cables (16 and 20) at the turnbuckles (18).
e. Remove the cable guard pin at fuselage stations 331.5 and 340.0.
f. Disconnect the trim control rod (39) from the trim screw (30).
g. Remove the anti-rotation guide bushing and bolt assembly (33) from the aft end of the screw
(30).
h. Remove the trim sender arm (25) from the trim screw.
i. Remove the cap bolts that attach the screw assembly to the spar.
j. Remove the screw assembly through the access hole and draw the trim cables from the fuselage
and fin.
5-50. INSTALLATION OF RUDDER TRIM ASSEMBLY. (Rudder) (Refer to Figure 5-10.)
a. Ascertain that the trim cable assembly is evenly wrapped (centered) on the drum, the drum
centered between stops on the trim screw and the cables blocked to prevent them from unwrapping.
b. Position the screw assembly in the vertical fin, install the attachment bolts and secure.
c. Draw the cables (16) through the fin into fuselage and connect them at the turbuckles (18) at
station 287.5. (If the cables from the control pedestal are not installed, draw the cables tight and block
them at the bulkhead at station 317.75. Install the trim screw assembly in the control pedestal.)
d. Remove the cable blocks from next to the trim screw assembly and from the cables leading from
the control pedestal.
e. Install the anti-rotation guide bushing and bolt assembly (23) at the aft end of the screw (30).
f. Connect the control rod (39) to the trim screw (30) and secure.
g. Connect the trim sender arm (28) to the trim screw. Allow the sender arm to rotate freely on the
sender shaft (27) until trim rigging and adjustment is made.
h. Install the cable guard pin at fuselage stations 331.5 and 340.0.
i. With the complete trim control system installed, 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.
j. Install access plates and panel.
5-51. REMOVAL OF RUDDER TRIM SENDER ASSEMBLY. (Refer to Figure 5-10.)
a. Remove the access plate located on the right side of the vertical fin.
b. Disconnect the electrical leads to the sender (26).
c. Disconnect the trim sender arm (28) from the trim screw (30).
d. Remove the sender (26) with mounting bracket (25) by removing the mounting bracket
attachment screws from the left surface of the vertical fin.
e. Remove the sender through the access opening.
f. Remove the arm from sender shaft.
g. Remove sender from mounting bracket.
Reissued: 10/12/79
SURFACE CONTROLS
1J15