Piper APACHE PA-23-235 Service Manual page 132

c. Prepare the various lines, control cables and wires for inserting into the wing or fuselage when the
wing is slid into place.
d. Slide the wing into the fuselage and butt the spar ends. (Maximum distance of .031 of an inch is
permissible between spar caps.)
e. Insert the tachometer shaft through the control cable guide tube, followed with the throttle,
carburetor heat or alternate air, propeller governor and mixture controls.
f. Attach the main spar to the fuselage frame on the side of the fuselage. Install a bolt down through
the spar and fuselage frame on the forward side and secure with washer and self-locking nut. Install
a bolt and shim (P/ N 17480-00) down through the spar and fuselage frame, and secure with a
washer and self-locking nut.
g. Attach the rear spar to the fuselage frame fitting by inserting the bolt from the aft side. The
maximum permissible gap between the rear spar and the frame fitting is . 125 of an inch, before the
attaching bolt is tightened. If the gap is .062 of an inch or under, draw up with bolt, washer and self-
locking nut. If the gap is .062 to . 125 of an inch, use a shim ( P/ N 80122-87) and draw up
remaining gap with bolt, washer and self-locking nut.
h. Install the spar straps. Position the straps, one to the top front (a shim P/ N 18283-00 may be used if
needed), one to the bottom front, and one to the bottom aft. Keeping in mind the .032 of an inch
maximum allowed gap between the spar caps, secure the straps with bolts, installed through the
forward side, and self-locking nuts. Torque bolts from 100 to 140 inch-pounds.
i. Connect the top of the main spar at the side of the fuselage. Install the bolt from the front, a spacer
block on the front, and a bushing and spacer block on the aft side. Secure with a washer and self-
locking nut. Shims (.020, P/N 18380-02; .032, P/N 18380-03; or .064, P/N 18380-04) may be
installed between the fuselage frame brackets and the spacer blocks, as required, to obtain a proper
fit.
j. Install the plates to the top and bottom of the spar with bolts, washers and self-locking nuts.
Washers are required under the heads of the two front center bolts of the upper and lower plates.
Torque bolts to 160-190 inch-pounds.
k. Attach the front spar to the fuselage frame bracket with a bolt installed from the front and secured
with a self-locking nut. A maximum of two washers (AN960-616) may be installed between spar
fitting and frame bracket to provide a proper fit. When installing a new wing, first drill a pilot hole
through the forward side of the spar using a fabricated tool, as shown in Figure 4-5, for hole
alignment, and a .125 inch drill. (The tool may be fabricated from dimensions given in Figure 4-
22.) Then, drill out the spar attachment hole from the aft side using a .375 inch drill.
IV - STRUCTURES
PIPER AZTEC SERVICE MANUAL
1G2
07/15/06