G1000 NXi System Maintenance Manual
Page 205
King Air 300 Series
Revision 1
190-00716-N1
Failure Message
Cause
Solutions
MAG VAR WARN – Large
magnetic variance. Verify all
course angles.
Magnetic variance value from
GMU 44 is not accurate.
•
If flying near large radio towers or
other sources of possible
electromagnetic interference, the
condition should correct itself as the
aircraft leaves the area.
•
If problem persists, run magnetic
interference check in Section 5.17.4
to check for magnetic interference in
the aircraft.
PIT (amber pitch flag)
Pitch Miscompare:
Difference in the pitch sensors is
greater than 5 degrees.
Perform Calibration Procedure A1: GSU
75B, GRS 77, or GRS 7800 Pitch/Roll
Offset Calibration (reference Section
7.10.1).
ROL (amber roll flag)
Roll Miscompare:
Difference in the roll sensors is
greater than 6 degrees.
Perform Calibration Procedure A1: GSU
75B, GRS 77, or GRS 7800 Pitch/Roll
Offset Calibration (reference Section
7.10.1).
GMU Alerts
Failure Message
Cause
Solutions
MANIFEST – GMU1 software
mismatch. Communication
halted.
The system has detected an
incorrect software version loaded
in the specified GMU 44.
Load the correct software version.
MANIFEST – GMU2 software
mismatch. Communication
halted.
HDG FAULT – AHRS1
magnetometer fault has occurred
A fault has occurred in the
specified magnetometer; heading
will be flagged invalid.
•
Check GMU 44/GSU 75B, GRS 77,
or GRS 7800 interconnect for faults.
Replace GMU 44.
If problem persists, replace
GSU 75B, GRS 77 or
GRS 7800.
HDG FAULT – AHRS2
magnetometer fault has occurred.
HDG (amber heading flag)
Heading Miscompare:
Difference in the heading sensors
is greater than 6 degrees.
Perform Calibration Procedure E:
Magnetometer Interference Test
(reference Section 5.17.4) and
Procedure B: GSU 75B, GRS 77, or
GRS 7800 and GMU 44 Magnetometer
Calibration (reference Section 7.10.3).
Summary of Contents for G1000 NXi
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