Table 5-4, Afcs General Troubleshooting - Garmin G1000 Nxi System Maintenance Manual

Annunciation Condition
Aileron Mistrim Right
Aileron Mistrim Left
Rudder Mistrim Right
Rudder Mistrim Left
Pre-Flight Test Fails
Condition
Poor AP Performance
(Limited AP Authority)
AP DISC Problems
Loss of Manual Electric Trim
AutoTrim Inoperative
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Resolution
•
Check for possible fuel imbalance.
•
Check aileron control adjustments.
•
If mistrim condition still exists remove and replace the roll servo.
•
Check rudder control adjustments.
•
If mistrim condition still exists remove and replace the yaw
servo.
•
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, see Section 5.8.3 for additional PFT diagnostics.

Table 5-4, AFCS General Troubleshooting

Resolution
•
Check each servo gearbox slip clutch per Section 4.9. Verify the
clutches are not excessively loose and are within torque limits.
•
Check aircraft controls for proper balancing and adjustment per
the King Air 300 Series Maintenance Manual.
•
Check aircraft control cables for proper tension per the King Air
300 Series Maintenance Manual.
•
For intermittent nuisance disconnects with no AFCS of PFT alert,
check A/P disconnect switch and wiring for intermittent faults.
•
If an AFCS or PFT alert is displayed at the time of the disconnect,
troubleshoot per Section 5.8.
•
Check the GIA AFCS Fault Logs according to Section 5.8.2. If a
Mon Prmtr Invalid message is received, check for valid true
airspeed. A faulty GTP 59 OAT probe may cause TAS to become
invalid, which will flag the Mon Prmtr Invalid message.
•
Contact Garmin Product Support for assistance
•
Check pitch trim servo status.
•
Check MET switch discrete inputs to both GIAs by going to the
GIA I/O Configuration page and selecting DISCRETE IN inputs.
•
Check flap-in-motion discrete inputs to both GIAs for proper
operation by going to the GIA I/O Configuration page and selected
DISCRETE IN inputs. See Section 4.8.
•
If DATA indicator fails to illuminate or illuminates incorrectly,
troubleshoot flap motor & discrete input wiring (refer to G1000
Wiring Diagram, listed in Table 1-1,).
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