Garmin SA01456Wi_D Manual Page 156

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Page 5-32 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
Annunciation Condition Resolution
Aileron Mistrim
Right
Check for possible fuel imbalance.
Check aileron control adjustments.
If mistrim condition still exists remove and replace the roll
servo.
Aileron Mistrim
Left
Rudder Mistrim
Right
Check rudder control adjustments.
If mistrim condition still exists remove and replace the yaw
servo.
Rudder Mistrim
Left
Pre-Flight Test
Fails
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 5.6.5 for additional PFT diagnostics.
Table 5-4. AFCS General Troubleshooting
Condition Resolution
Poor AP Performance
(Limited AP Authority)
Check each servo mount slip clutch per Section 4.9. Verify
the clutches are not excessively loose and are within
torque limits.
Check aircraft controls for proper adjustment per the King
Air Model 90 Series Maintenance Manual.
Check aircraft control cables for proper tension per the
King Air Model 90 Series Maintenance Manual.
AP DISC Problems
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 5.5.
Check the GIA AFCS Fault Logs according to Section
5.6.4. 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
Loss of Manual Electric Trim
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.
AutoTrim Inoperative
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/GFC 700 Wiring Diagram, listed in Table
1-2).
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