GRT Avionics HXr Installation Manual
Revision A -5 2-17
Sharing the Magnetometer
The digital magnetometer serial data output may be shared with other GRT Avionics GADAHRS,
and with the Mini-EFIS that may also be a part of your panel. To share the data, simply tee the
serial output from the magnetometer with other devices. Only one source of power should be
provided to the magnetometer. If your panel includes a GRT Avionics Mini-EFIS with a battery
backup, we recommend using the Mini-EFIS to power the magnetometer.
Setup for the Magnetometer
Refer to the section "Validating the Magnetometer Location" to find the best location. Before
validating a magnetometer location, temporarily mount the magnetometer (such as by using
masking tape), Go to Set Menu > AHRS Maintenance > Set Magnetometer Orientation. Answer
the prompts on the screen to begin automatic orientation of the magnetometer. Upon completion,
the heading data displayed on the PFD screen should be approximately correct.
Magnetometer Mounting Requirements
There is not a designated “top” of the magnetometer, so it can be turned on its side for easier
mounting. The side of a wing tip rib is a simple place to put it. The following requirements must
be met.
·
The magnetometer is marked with an arrow pointing in the direction of flight. This will position
the d-sub connector on the aft side.
·
Mount it such that the centerline of the magnetometer is parallel to the centerline of the airplane
from a top view.
·
The "pitch" attitude of the magnetometer should be within the range of +/- 60 degrees.
2.2 Legacy Equipment - AHRS (Part No. AAS-) Installation
The AHRS is not affected by wiring, magnetic field, heat, temperature or vibration influences.
However, good practices suggest that it should be located where these influences are minimized.
The pitot and static connections are made to the AHRS, so its location should consider this.
It is important that the AHRS is mounted so that the roll, pitch and yaw axes of the AHRS are parallel
to the roll, pitch and yaw axes of the aircraft. The precision that this is achieved influences the final
performance of the EFIS.
There is no requirement that the AHRS roll, pitch or yaw axes be parallel to those of its associated
display unit.
Be sure to mount the AHRS with the connector toward the rear of the airplane. Observe the label
on the AHRS to ensure it is oriented correctly.
2.3 Legacy Equipment - Magnetometer Installation (for AHRS Part No. AAS-)
Determining the location of the magnetometer requires considerable care because of the
magnetometer's sensitivity to magnetic disturbances generated by the airplane. No periodic
