Garmin G1000 Maintenance Manual page 103

__________________________________________________________________
The following annunciations may appear in the AFCS Annunciation field:
Annunciation
Pitch Axis Failure
Yaw Axis Failure
Roll Axis Failure
Elevator Mistrim
Elevator Mis-Trim
Aileron Mistrim Left
G1000 System Maintenance Manual
190-00907-00
Condition
•
AFCS System
Failure
•
•
•
•
•
Pitch Trim Axis
Failure
•
•
Down
•
•
•
Up
•
Aileron Mistrim
Right
•
•
•
•
•
Pre-Flight Test
Solutions
Ensure that the system is in proper working order.
Check specifically for proper operation of the:
−
GIA 63/W Integrated Avionics Unit
−
GRS 77 AHRS
−
GDC 74A Air Data Computer
−
All GSA 80/81 Servos and GTA82 Pitch Trim
Adapter (GTA82 only used on certain OEM aircraft)
Check that no red X's are present on the MFD and
PFDs.
Check that there are no Alert messages present in the
PFD Alert window. Correct any software or
configuration errors noted.
Go to the AUX SYSTEM STATUS page on the MFD and
verify that all LRUs have a 'green' check.
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.
Ensure PTRM switches are not stuck. If failure condition
still exists, remove and replace the affected servo.
If mistrim annunciations persist, check the GTA 82 and
trim motor servo for proper operation. Verify that the
servo is online at the AUX – SYSTEM STATUS page.
Check the GTA 82 and trim motor servo wiring and
connector. Ensure the servo is receiving power.
Check the aircraft trim control rigging.
If mistrim condition still exists, remove and replace the
affected servo.
Check for possible fuel imbalance.
Check aileron control rigging.
If mistrim condition still exists remove and replace the
roll servo. If mistrim condition still exists remove and
replace the roll servo.
If mistrim condition still exists remove and replace the
roll trim motor.
Reset system power.
Allow the system to complete pre-flight tests. The
preflight test should finish within 2 minutes. If it does not
pass, the red 'PFT' annunciation is shown. In case of
PFT failure, troubleshoot in the same manner as for the
red 'AFCS' annunciation.
Page 5-67
Rev. B