Removal Of Rudder Horn; Installation Of Rudder Horn; Rigging And Adjustment Of Rudder Controls - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL.
5-45. REMOVAL OF RUDDER HORN. (Refer to Figure 5-13.)
a.
Remove the left pilot's seat and floor panel to the left of the control pedestal.
b.
Remove the access plate, under the rudder, on the top aft section of the fuselage.
c.
Relieve cable tension from the rudder control by loosening one of the turnbuckles (4) at fuselage
station 76.00.
d.
Mark one end of the rudder horn (17) and cable end (45) to facilitate installation and disconnect
the cables from the rudder horn.
e.
Unbolt the rudder horn (17) from the rudder torque tube plate (42) and the hinge fitting (46).
Remove the horn.
5-46. INSTALLATION OF RUDDER HORN. (Refer to Figure 5-13.)
a.
Position the rudder horn (17) under the rudder torque plate (42) and on the hinge fitting (46).
Install bolts and torque.
b.
Connect the rudder cables to the horn and secure. Allow the cable ends (45) to rotate freely.
c.
Set cable tension per Table V-ll and rigging and adjustment per paragraph 5-47.
d.
Install access plate, panel, and seat.
5-47. RIGGING AND ADJUSTMENT OF RUDDER CONTROLS. (Refer to Figure 5-13.)
a.
Ascertain that the left pilot's seat, the floor panel to the left of the control pedestal and tail cone
are removed.
b.
To adjust the rudder and rudder pedal for neutral, it first should be ascertained that the nose gear
steering has been aligned with the rudder pedals according to - Alignment of Nose Landing Gear, Section
VII. Adjustment of the rudder and rudder pedals may be accomplished as follows:
1. Clamp the rudder pedals to align in a lateral position as shown in Figure 5-14.
2. Adjust the turnbuckles (4) at fuselage station 76.00 to obtain proper cable tension, per Table V-
II, and to align the rudder at neutral position. Neutral position of the rudder may be established by aligning
vertically the forward overhang at the upper portion of the rudder with the vertical fin or with the use of the
fabricated rudder rigging jig. (A rigging jig and pointer may be fabricated from specifications given in Figure 5-
20.)
c. Rudder travel adjustment with the use of the fabricated rudder rigging tool (Refer to Figure 5-15)
may be accomplished as follows:
1.
Level the airplane longitudinally and laterally. (Longitudinal leveling is not mandatory if a
propeller protractor is used for this adjustment.)
2.
Allow the elevator to remain in its down position.
3.
Position the jig on the elevator torque tube and slide it to the left until the centerline on the
jig plate aligns with the centerline of the airplane.
4.
Set a bubble protractor to 29 28'and position it on the centerline of the jig plate. (This
angle assures rudder travel measurement perpendicular to the rudder hinge centerline.)
5.
With protractor still set to 29
°
28', center the bubble by adjusting the screws at the aft end
of the jig plate. (Keep jig legs tight to elevator torque tube.)
6.
Slide the pointer into the trailing edge of the rudder with the point approximately .125 inch
from plate.
7.
Set rudder with stops to the degree of travel as given in Table V-II and lock stops.
NOTE
If provisions are provided for safety wiring the nut and screw on
the rudder hinge assembly, safety wire with MS20995C as shown
in Figure 5-8a.
Revised 3/11/81
SURFACE CONTROLS
1124