Garmin CIRRUS PERSPECTIVE SR20 Line Maintenance Manual page 140

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• Stuck switch invalidated parameter: <AXIS>
A MET switch in the specified axis is stuck.
Check the MET (trim) switches for proper operation.
• PRMTR: <PARAMETER> MODE:<MODE> Parameter lost
The mode specified by <MODE> has disengaged because the parameter specified by
<PARAMETER> has become invalid. The following is a list of some of the possible values for
<PARAMETER>:
AD TDM Comm Valid: The specified mode has been disengaged because
communication with the servos, via the Time Division Multiplexer protocol, has been
lost.
Troubleshoot possible loss of communication paths to servos or loss of servo/AP
disconnect power to the servos.
AP Pitch MET not stuck: The specified mode has been disengaged due to a stuck pitch
MET switch.
Check the MET (trim) switches for proper operation.
GIA Pre‐Flight Test Steps
• PFT Step 0: System initializing, verify GFC powered
This step checks to make sure the GFC is powered up.
Make sure the GIA is connected to the autopilot disconnect on the GFC Configuration page.
Make sure all configured servos are communicating on the System Status page.
• PFT Step 1: System initializing, verify GIA audio is valid
This step checks to make sure the GIA audio region has been loaded and configured.
Load GIA audio files to correct.
• PFT Step 2: System initializing, verify required servos are configured
This step checks to make sure the current servo configuration matches the servo
configuration specified in the certification gain file.
Reload the gain files to correct.
• PFT Step 3: System initializing, verify selected side
This step checks to make sure the PFD is online and sending the selected AFCS side data
over HSDB to the GIA.
Make sure the PFD is turned on.
Make sure the Ethernet connection from the PFD to the GIA is functioning.
Page 5-94
Rev. E
Cirrus Perspective™ Line Maintenance Manual
190-00920-00