System Maintenance Manual

Page 5-86 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision G 190-00682-01
5.22 Standby Attitude Indicator Troubleshooting
5.22.1 Standby Attitude Indicator Common Problems
Symptom Recommended Action
Warning flag pops into view,
indicating that the gyro motor is
not receiving sufficient power to
operate
• Perform the Standby Instrument Electrical Power Checks in Section 8.1.5.
• Remove the unit per Section 6.25 and inspect the electrical connector.
• Check to ensure appropriate electrical power is being supplied to the
instrument.
√ If input electrical power is not adequate, troubleshoot the wiring
harness.
√ If input power is appropriate, the unit must be removed and
serviced by a qualified service facility See Section 6.25 for removal
instructions. Contact the manufacturer to find a qualified service
facility
Unit fails to perform to
specifications
• The unit must be removed and serviced by a qualified service facility.
See Section 6.25 for removal instructions. Contact the manufacturer to
find a qualified service facility.
5.23 Standby Airspeed Indicator Troubleshooting
5.23.1 Standby Airspeed Indicator Common Problems
Symptom Recommended Action
Airspeed Indicator lighting is
inoperative or malfunctioning
• Perform the Standby Instrument Electrical Power Checks in Section 8.1.5.
• Remove standby airspeed indicator per Section 6.23 and inspect the
electrical connector.
• Check that electrical power is being appropriately supplied to the
instrument.
√ If the input electrical power is not adequate, troubleshoot the wiring
harness.
√ If the input electrical power is appropriate, replace the standby
airspeed indicator or contact the manufacturer for further
troubleshooting.
Airspeed displayed is incorrect
• Using a pitot-static ramp tester, check airspeed displayed on standby
altimeter against airspeed display from ADC2.
√ If the airspeeds are the same, inspect the pitot/static ports and
associated equipment for faults.
√ If the airspeeds are different, replace the standby altimeter or
contact the manufacturer for further troubleshooting. See Section
6.23 for removal instructions.