Control cables have a way of wearing out and fraying
wherever they pass round pulleys. Every time an aeroplane
comes down from flight the rigger should carefully examine
the cables, especially where they pass round pulleys. If
he finds a strand broken, he should replace the cable.
The ailerons' balance cable on the top of the top plane
is often forgotten, since it is necessary to fetch a high pair
of steps in order to examine it. Don't slack this, or some
gusty day the pilot may unexpectedly find himself minus the
aileron control.
CONTROLLING SURFACES.--The greatest care should be
exercised in rigging the aileron, rudder, and elevator properly,
for the pilot entirely depends upon them in managing the
aeroplane.
The ailerons and elevator should be rigged so that, when
the aeroplane is in flight, they are in a fair true line with the
surface in front and to which they are hinged.
If the surface to which they are hinged is not a lifting
surface, then they should be rigged to be in a fair true line
with it as illustrated above.
If the controlling surface is, as illustrated, hinged to the
back of a lifting surface, then it should be rigged a little below
the position it would occupy if in a fair true line with the
surface in front. This is because, in such a case, it is set
at an angle of incidence. This angle will, during flight,
cause it to lift a little above the position in which it has been
rigged.
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