1. The aeroplane must be placed in its flying position
and sufficiently high to ensure the wheels being off the ground
when rigged. When in this position the axle must be hori-
nontal and the bracing wires adjusted to secure the various
set measurements stated in the specifications.
2. Make sure that the struts bed well down into their
sockets.
3. Make sure that the shock absorbers are of equal
tension. In the case of rubber shock absorbers, both the
number of turns and the lengths must be equal.
HOW TO DIAGNOSE FAULTS IN FLIGHT, STABILITY, AND CONTROL.
DIRECTIONAL STABILITY will be badly affected if there is
more drift (i.e., resistance) on one side of the aeroplane than
there is on the other side. The aeroplane will tend to turn
towards the side having the most drift. This may be caused
as follows:
1. The angle of incidence of the main surface or the tail
surface may be wrong. The greater the angle of incidence,
the greater the drift. The less the angle, the less the drift.
2. If the alignment of the fuselage, fin in front of the
rudder, the struts or stream-line wires, or, in the case of
the Maurice Farman, the front outriggers, are not absolutely
correct--that is to say, if they are turned a little to the
left or to the right instead of being in line with the direction
of flight--then they will act as a rudder and cause the aeroplane
to turn off its course.
3. If any part of the surface is distorted, it will cause
the aeroplane to turn off its course.
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