General Troubleshooting; Table 5-3, Afcs Annunciation Troubleshooting - Garmin G1000 Nxi System Maintenance Manual

General Troubleshooting

The following annunciations may appear in the AFCS Annunciation field:

Table 5-3, AFCS Annunciation Troubleshooting

Annunciation Condition
AFCS System Failure
Pitch Axis Failure
Pitch Trim Axis
Failure
Yaw Axis Failure
Roll Axis Failure
AHRS Monitor
Failure
Elevator Mistrim
Down
Elevator Mistrim Up
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Resolution
•
Confirm AFCS Servos circuit breaker IN
•
Ensure that the G1000 system is in proper working order.
Check specifically for proper operation of the:

GIA 63 Integrated Avionics Units

GRS 77 or GRS 7800 AHRS or GSU 75B ADAHRS Units

GDC 7400 Air Data Computers

All GSA 80 Servos
•
Check that no red X's are present on the MFD and PFD
displays.
•
Check that no related alert messages are present on the PFD
displays (press the ALERTS softkey).
•
Go to the Aux – System Status page on the MFD and verify
that all LRUs have a 'green' check (see Section 5).
•
In Configuration mode, review the GFC 700 equipment status,
software, and certification gains.
•
Reload software, configuration, and certification gains to the
GIAs and GSA 80 servos.
•
Check the GFC Status page for additional GFC 700 system
information.
•
Review the fault and assert logs for the GIAs and servos (see
Section 5.8.2)
•
Isolate the fault to an LRU. Replace this LRU and confirm the
resolution of the annunciation.
•
Check the Aux – System Status page to see if the servo is
online (green check).
•
Check that the affected servo is receiving power.
•
Check the servo wiring and connector.
•
For pitch trim, check pitch trim switch operation to verify switch
contacts are not stuck.
•
If failure condition still exists, remove and replace the affected
servo.
•
If the AHRS inputs have been determined to be "unreasonable"
while the AP is engaged, in air, this message will be displayed
until AHRS inputs are determined reasonable for 5 seconds.
•
If elevator mistrim annunciations persist, check the pitch and
pitch trim servos for proper operation. Verify that the servo is
online at the Aux – System Status page.
•
Check the servo wiring and connectors. Ensure the servo is
receiving power.
•
Check the aircraft control adjustments.
•
If mistrim condition still exists, remove and replace the affected
servo.
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