Air Creation BioniX2 13, Maintenance Manual

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GDMMBi²13-1G Version 0010 7
3.5.2 Nose Plates
The nose plates are bolted to the keel and provide attachment points from the leading
edges to the keel. They are attached to the keel with bolts. The nose plate bolts also fasten
the U-channel to the keel. The gooseneck catch fastens the front wires to the U-channel.
3.5.3 U-Bracket
The U-bracket is the major junction for the three main components of the aircraft, the
wing (keel attachment), trike (mast attachment) and control frame (top knuckle
attachment). The U-bracket has two components, a U-shaped channel, and an internal
Delrin sleeve.
The U-bracket is allowed to rotate around the keel, and is held in position longitudinally
by rings that are bolted to the keel.
The U-bracket should be checked thoroughly after any unusual loads, especially torsional
ones.
3.5.4 King Post
The king post assembly is a vertical post in aluminum 6082 that supports the reflex
bridles, the top front wire, and the top side wires. The king post works in compression,
and is secured to the keel by means of an aluminum locating foot.
3.5.5 Tensioning U-channel
The cross bars tensioning U-channel is bolted to the keel with two bolts. These bolts are
used to attach the rear wires.
3.5.6 Control Frame
The control frame is constructed mainly from 6005 AT5 and 2017 A aluminum. The
control frames down tubes work mainly in compression due to the positive loading of the
wing, which is reacted through the side wires and base bar sections. The base bar works
mainly in tension through the side wire loads from the crossbar and leading edges.
The control frame is bolted to the keel through the U-bracket. The fittings at the top of
the control frame allow relative movement between the U-bracket and the control frame.
This is necessary because of the movement between the base and the wing during the
weight shift control actions.
The control bar is not symmetrical. The central portion is offset from the ends to
compensate for lateral displacement of the trike due to the torque of the engine. For
an engine whose propeller rotates counterclockwise (Rotax 912), the center part
must be shifted to the Left. For a propeller rotating clockwise (Rotax 582), the center
part must be offset to the Right. If necessary, reverse the direction of the control bar
if it does not correspond to the engine used, by removing the connecting screws with
the A-frame uprights.