Garmin CIRRUS PERSPECTIVE SR20 Line Maintenance Manual page 141

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• PFT Step 4: System initializing, verify AHRS monitor
This step checks to make sure the AHRS monitor is valid and not reporting an AHRS failure.
NOTE: AHRS monitor will be assumed valid if on the ground.
Make sure the GRS 77 and GDC 74A are turned on and sending valid data.
• PFT Step 5: System initializing, verify configured servos are valid
This step checks to make sure that none of the servos are reporting any type of failure.
Note that trim servos will report a failure on stuck MET switches.
Make sure the MET switch is not stuck.
Cycle power on all servos.
• PFT Step 6: System initializing, verify cross GIA valid
This step checks to make sure the cross‐side GIA is online and communicating with all
servos from ARINC 485 data lines. The cross‐side GIA must also pass its AHRS monitoring.
Make sure both GIAs are online and communicating with all servos.
• PFT Step 7: Verify cross GIA initialized
This step checks to make sure the cross‐side GIA is initialized.
Cycle power on all servos and GIAs.
Make sure the PFD and MFD are turned on.
• PFT Step 8: Verify servo type
This step checks to make sure the servos are the correct type.
Make sure the servos are correct type.
• PFT Step 9: Verify servo first certification data
This step checks to make sure the servos and the GIAs have the same certification gains.
Reload the certification gains to all GIAs and servos.
• PFT Step 10: Verify servo second certification data
This step checks to make sure the servos and the GIAs have the same certification gains.
Reload the certification gains to all GIAs and servos.
• PFT Step 11: Updating servo RTC
This step sets the servo system time to the GIA system time.
If fails this step, GIA's cannot communicate with servos. Check for GIA/servo data path
issues and power/AP disconnect loss.
Cirrus Perspective™ Line Maintenance Manual
190-00920-00
Page 5-95
Rev. E