G1000 NXi System Maintenance Manual
Page 170
King Air 300 Series
Revision 1
190-00716-N1
General Troubleshooting
The following annunciations may appear in the AFCS Annunciation field:
Table 5-3, AFCS Annunciation Troubleshooting
Annunciation
Condition
Resolution
AFCS System Failure
•
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.
Pitch Axis Failure
•
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.
Pitch Trim Axis
Failure
Yaw Axis Failure
Roll Axis Failure
AHRS Monitor
Failure
•
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.
Elevator Mistrim
Down
•
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.
Elevator Mistrim Up
Summary of Contents for G1000 NXi
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