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LMM for the Kodiak 100
Page 4-81
190-02102-00 Rev.4
4.7.8.4 GPS Input Failure
Two GPS inputs are provided to the AHRS. If GPS information from one of the inputs
fails, the AHRS uses the operating GPS input and a System Message is issued to inform
the flight crew. If both GPS inputs fail, the AHRS can continue to provide attitude and
heading information to the PFD as long as magnetometer and airspeed data are
available and valid.
4.7.8.5 Magnetometer Failure
If the magnetometer input fails, the AHRS transitions to one of the reversionary No-
Magnetometer modes and continues to output valid attitude information. However, if the
aircraft is airborne, the heading output on the PFD does become invalid (as indicated by
an amber X).
4.7.8.6 Air Data Input Failure
Failure of the air data input has no affect on the AHRS output while AHRS is receiving
valid GPS information. Invalid/unavailable airspeed data in addition to GPS failure results
in loss of all attitude and heading information on the PFD.
4.7.8.7 AHRS Troubleshooting
Troubleshoot the AHRS according to the symptoms and recommended actions shown in
.
Table 4-14. AHRS Troubleshooting
Symptom
Recommended Action
The AHRS does not complete
initialization.
• Make sure no cell phone or device using cell phone
technology is turned on in the cabin, even in a
monitoring state.
• Make sure the GPS has acquired at least four
satellites, has a 3D navigation solution, and a DOP
of less than 5.0. This is particularly important if this
issue appears during ground operation only. if the
message Calibrate AHRS/Mag is present, perform
a GRS/GMU Calibration.
• Check the GRS 79 configuration module wiring for
damage. Check the GRS 79 connector for bent
pins. If no damage can be found, replace the
configuration module.
• Replace the GRS 79 if the problem continues.
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