Symmetry Check
A misaligned condition can seriously affect the flying qualities of the aircraft.Misalignment may not apparent by casual observation and may be founded only be alignment checks using instruments.
Note: Alignment check is normally make after any major structural repair or after the airplane has been subjected to severe conditions.
A symmetry check is used to verify this alignment and is determined by first leveling the aircraft and then measuring the disrances from reference points on the aircraft central axis to reference point on the adjustable components.
Note: If all measurements are within the tolerances given in the maintenance manual, the aircraft is in correct alignment,Vice versa.
The vertical symmetry of an aircraft can be checked by the use of measuring tape to check the distance between the tip of the vertical stabilizer and the horizontal stabilizer.
Some Technicians lay out the reference point on the floor of the hangar by used of plumb bob, so they can make the measurement on the floor.
Effect of rigging on flight
The Purpose of rigging an aircraft is to obtain the most efficient flight characteristic possible.
A properly rigged and trimmed airplane will fly straight and level, "hands off" at its normal cruise speed.If it disturbed by the air, it will correct itself and resume straight and level flight.
Note:If the aircraft is out of rig, meaning that the component are not properly aligned.
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