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

5.6.1
General Troubleshooting
The following annunciations may appear in the AFCS Annunciation field:
Annunciation Condition
AFCS System
Failure
Pitch Axis Failure
Pitch Trim Axis
Failure
Yaw Axis Failure
Roll Axis Failure
AHRS Monitor
Failure
Elevator Mis-Trim
Down
Elevator Mis-Trim
Up
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01

Table 5-3, AFCS Annunciation Troubleshooting

Resolution
•
Confirm AFCS Servos circuit breaker IN
•
Ensure that the G1000 system is in proper working order.
Check specifically for proper operation of the:
•
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 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 5.6.3)
•
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.
GIA 63 Integrated Avionics Units
GRS 77 AHRS Units
GDC 7400 Air Data Computers
All GSA 80 Servos
Page 5-29
Revision 1