190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 14-4
Fuselage mounting is less desirable because of numerous potential disturbances that interfere with accurate
operation. For installations with dual GMU 22 magnetometers, co-locating the two magnetometers close to
each other in the tail or in one wing is recommended as this reduces the likelihood of heading splits or
miscompares when operating on the ground in the vicinity of local magnetic anomalies.
Mechanical mounting fixtures for the GMU 22 must be rigidly connected to the aircraft structure. Use of
typical aircraft-grade materials and methods for rigid mounting of components is acceptable, so long as
adequate measures are taken to provide a stiffened mounting structure.
Level the GMU 22 mounting rack to within 3.0° of the in-flight level cruise attitude.
Align the GMU 22 mounting rack’s forward direction to within 0.5° of the longitudinal axis of the aircraft.
In a system with more than one ADAHRS (GSU 25/73), ADAHRS 1 must be connected to a GMU22, but
installing additional GMU 22 units for other GSU 25 ADAHRS units is optional. An ADAHRS without a
GMU 22 connected will use magnetometer data supplied by other ADAHRS as long as they are both
communicating through CAN.
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