Removal Of Aileron Bellcrank Assembly; Installation Of Aileron Bellcrank Assembly; Rigging And Adjustment Of Aileron Controls - Piper Navajo PA-31 Service Manual

5-10. REMOVAL OF AILERON BELLCRANK ASSEMBLY. (Refer to Figure 5-2.)
WARNING
Before removing either bellcrank assembly, use red enamel paint
to restore color code on balance cable end and aft bellcrank lug.
a. Remove the access plate to the bellcrank assembly.
b. Relieve cable tension from the control system by rotating one of the tumbuckles (2) attached to the
bellcrank ( or 24).
c. Disconnect the tumbuckle ends (54 and 55) from the forward and aft ends of the bellcrank (24).
d. Disconnect the aileron control rod (25) at the bellcrank.
e. Remove the pivot bolt (62) securing the bellcrank and remove bellcrank from wing.
f. The stop block (61) may be removed by unbolting and removing from the wing.
5-11. INSTALLATION OF AILERON BELLCRANK ASSEMBLY. (Refer to Figure 5-2.)
a. Place the bellcrank (1 or 24) in its mounting bracket with the adjustable stops (59) toward the outboard
end of the wing.
b. Install the pivot bolt (62) and torque.
c. Install the aileron control rod (25). secure bolt assembly (56) and safety.
d. Connect the turnbuckle ends (54 and 55) to the bellcrank (24), secure and safety.
WARNING
The aft end of the bellcrank and balance cable end are painted
red to help facilitate proper hook-up. Do not tighten tumbuckle
fork ends on bellcrank so tight that the ends cannot rotate.
e. Install stop block (61) and torque bolts.
f. Check aileron controls rigging and adjustment as per Paragraph 5-12.
g. Install access plate and secure.
5-12. RIGGING AND ADJUSTMENT OF ALLERON CONTROLS. (Refer to Figure 5-2.)
a. To rig the aileron controls, set the right and left aileron bellcranks in neutral position by attaching an
aligning tool within both wings as shown in Figure 5-3. (This tool may be fabricated from dimensions given in
Figure 5-27.) The tool is used by the following procedure:
1. Remove the access plates to the aileron bellcranks at wing station 178.0.
2. Remove the cotter pin and nut that secures the forward turnbuckle fork end (SS) to the bellcrank (1
and 24). The bolt should not be removed.
3. Insert the tool between the bellcrank mounting brackets and over the end of the bolt from which
the nut was removed. (It may be necessary to loosen one of the primary control cables or the balance cable.)
4. Position the tool so that it fits tight against the outboard side of the bellcrank stop block (61).
5. Clamp the tool to the lower support bracket with a small "C" clamp. Place a small block of wood
or similar material between the clamp and lower bracket so as not to damage the bracket or bend the turned
edge that is around the bracket lighting hole.
b. Check or adjust the aileron for neutral position by the following procedure:
1. Place a modified straight edge, as shown in Figure 54 against the underside of the wing, next to
the outboard of the row of rivets at station 189.0 with the aft end of the tool even with the trailing edge of the
aileron. (This tool may be fabricated from dimensions given in Figure 5-28.) Do not place tool over rivets.
Revised: 2/18/94 SURFACE CONTROLS
1113
PIPER NAVAJO SERVICE MANUAL