Rigger: A qualified person who is employed in assembling and aligning aircraft.
Rigging: The relative adjustment or alignment of the different components of an aeroplane - particularly the wings.
Other terms for angle of incidence in this context are rigging angle and rigger's angle of incidence. It should not be confused with the angle of attack, which is the angle the wing chord presents to the airflow in flight.
In this area, riggers attach main rotor blades and tail rotor blades. They statically balance them. Any other final adjustments are being done in this particular room which is a pretty large room, but tiny compared to the overal size of the factory.
Incidence may also be called the 'rigger's incidence' or some similar expression carried over from the earlier days of aviation.
Longitudinal dihedral ...
Free flight models generally have to rely on the state of trim built in by the
designer and adjusted by the rigger, while the remote controlled models have
some form of trim devices which are adjustable during the flight.
You have to land with the wings level; otherwise one engine would hit the ground. A similar situation arises with certain amphibian aircraft that have outrigger-type floats or sponsons far from the centerline.
The machine is now ready for alignment, perhaps the most important of the rigger's duties.
Alignment of Airplanes.-The proper alignment of a machine largely determines the flying qualities of that machine.
 See also: Wing, Plane, Pilot, Aircraft, Flight
  
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