Removal Of Rudder Trim Sender Assembly; Installation Of Ruddr Trim Sender Assembly; Rigging And Adjustment Of Ruddr Trim - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
h.
Install the cable guard pin at fuselage stations 332.50 and 342.00.
i. With the complete trim control system installed, set cable tension with the turnbuckles (18) at station
287.50 per Table V-ll and check rigging and adjustment per paragraphs 5-55 and 5-56.
j. Install access plates and panel.
5-53. REMOVAL OF RUDDER TRIM SENDER ASSEMBLY. (Refer to Figure 5-13.)
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.
5-54 INSTALLATION OF RUDDER TRIM SENDER ASSEMBLY. (Refer to Figure 5-13.)
a.
Install the sender unit (26) on its mounting bracket by placing the index tab on the sender into
the index slot in the bracket. Secure the sender.
b.
Position the sender arm (28) on the shaft (27) of the sender and allow the arm to rotate freely
until adjustment is made.
c.
Position the sender mounting bracket in fin, install attachment screws and secure.
d.
Attach the sender arm (28) on the trim screw (30).
e.
Connect the electrical leads.
f.
Rig sender unit per paragraph 5-57.
g.
Install access plate.
5-55. RIGGING AND ADJUSTMENT OF RUDDER TRIM. (Refer to Figure 5-13.)
a.
To adjust the rudder trim, it must be ascertained that the following has been accomplished either
during installation or as a preadjustment check:
I.
Trim cables are evenly wrapped (centered) on their drums, both in the control pedestal and
in the fin, and both cable turnbuckles are located approximately at fuselage station 287.50.
2.
The trim drum (32) in the fin is centered between the stops (29 and 40) of the trim screw
(30).
3.
Cable tension is set as given in Table V-II.
b.
Remove the access plate on the right side of the vertical fin.
c.
With the trim screw connected to the control rod and not allowed to rotate, turn the trim drum
until 1.21 of an inch exists between the forward screw stop and the drum housing, as measured along the
screw. (Neutral position of the screw is at this measurement.)
d.
With the trim screw in neutral position, the trailing edges of the tab and rudder should align.
Should they not, remove the attachment bolt (37) and loosen the jam nut (35) on the rod end (36) at the
aft end of the tab control rod. Turn the rod end until the trailing edges align. Secure attachment bolt (37)
and rod end jam nut (35).
e.
Turn the trim in each direction to screw stops to check tab angle or measured distance from the
centerline of the rudder as given in Table V-I and also check minimum number of wraps left on trim drum.
(Minimum allowable is one and one quarter turns.)
f.
Check rigging and adjustment of trim sender and indicator per paragraph 5-56.
Reissued: 9/23/80 SURFACE CONTROLS
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