Page 9 - Aeronca 11AC Interactive Service Manual

These bolts pass through the spar butt clevis type fittings and fuselage spar attachment fittings. The spar
butt attachment fittings are designed to fit snugly to the fuselage fittings and should not be bushed or
shimmed. The front spar strut attachment fittings include tie down rings as an integral part of the fittings.
The rear strut is attached with a bolt through the spar and the strut upper end fitting.

Bellcrank and bracket assembly is cast aluminum. The counterbalanced bellcrank and ball bearings
provide ease of aileron control and is another new feature incorporated in the control system to insure
smooth positive control action.

Two .125 – 24 St Alclad Aluminum brackets bolted to the rear spar support the aileron in conjunction with
the aileron bellcrank assembly, which incorporates an aileron bearing support on the bellcrank bracket.
Ball bearings are also used in the aileron bracket supports. Position light wiring is provided in each wing
and is attached to the drag wire intersections running from the fuselage to the wing tip front.

Rigidity between front and rear spars is accomplished by the use of eight drag wires and four compression
struts. The drag wires are heat treated steel, 125,000 PSI Rockwell test, and in no instance should they
be replaced with soft wire. Care should be used when rebuilding or repairing the wing to avoid the use of
tools such as pliers which might scratch or crack these wires. A small scratch in this material may develop
into a crack and structural failure.

The compression struts are X4130 round steel tubing, not heat treated, to which brackets are welded on
each end. These compression assemblies are bolted to the rear and front spars.

Wing leading edges are reinforced with .016-24 ST 52 S ½ H. aluminum. Replacement of these parts
should be ordered by numbers shown on the drawing. Specify left or right when ordering any leading edge
section.

Wing tip bows are located at the outer wing tip as formers. The bow is made up of ½” .035-1025 steel
tubing and fastened to the tip rib, front and rear spars with clips as shown on the wing drawing.

COVERING

Two simplified methods of attaching fabric to the wing ribs has been used on the Aeronca Chief and
Champion. ¾” pinked tape is laid over the fabric and rib and fastened into place with aluminum washers,
No. 1-2331, and No. 4X1/4 stove head PK screws over which is laid 2” pinked tape doped to the fabric or,
fabric attachment wire placed over the fabric. The wire being covered with 2” pinked tape doped to fabric.

Caution: Wire attachment may not be used for partial rib repair. It is advisable in this instance to drill new
holes between the wire attachment holes and attach fabric with 4X1/4 stove head PK screws as mentioned
in first instance. When replacing whole or partial ribs with wire the ends should be cut and tucked in as
shown on wing drawing. These simplified methods of attaching fabric saves many tedious hours of rib
stitching formerly required when recovering wings.

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