Piper Navajo PA-31 Service Manual page 118

PIPER NAVAJO SERVICE MANUAL
123
Figure 4-3. Methods of Blocking Trim Cables
g. Install and bolt the fore and aft vertical spar splice channels.
h. Install and bolt the upper and lower,horizontal spar cap splice plates.
i. To the side of the fuselage, at the top of the main spar, bolt the fore and aft lower support fitting
to the upper support fitting and spar.
j. At the lower side of the main spar install support bolt assembly and bushing.
k. Install the angle support that extends through the fuselage and the brace assembly at the forward
side of the spar.
1. Tighten bolts of all attachment fittings, plates, etc. Torque bolts securing horizontal spar cap
splice plates to 160 to 290 inch pounds or 13 to 24 foot pounds; all other bolts use standard torque values.
m.
Draw the engine control cables into place.
n. At the wing leading edge and butt, connect the engine instruments, vacuum, fuel and hydraulic
lines. Secure the lines and cables in position with support blocks and clamps.
o. Connect electrical wire connectors.
p. Through the wing fairing access openings at the under side of the fuselage, connect the fuel and
hydraulic lines and fuel valves control cables.
q. Draw flap control cable into position; ascertain rigging is set (refer to Rigging and Adjustment of
Flap Controls, Section V) and secure cable.
r. If the right wing is being installed, the following items pertain to the installation of the right wing
only.
1.
Route the heater air duct, heat control cable, and antenna cables through the spar and
connect.
2. Route the hydraulic lines through the main spar and connect to their respective fitting at
stations 112. and 144.
3. Draw the aileron trim cables into the wing; connect turnbuckles at station 90 and unblock
cables. Install cable guard pin at butt end of wing. Check rigging and adjustment, cable tension (refer to
Rigging and Adjustment of Aileron Trim, Section V) and safety turnbuckles.
Reissued: 10/12/79
STRUCTURES
1E22