G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Page 5-23
190-00716-01
Revision 1
5.2.3
Engine/Airframe Instrument Failures
The following table provides guidance for troubleshooting individual engine/airframe sensor failures. Be
sure to also follow previous guidance given for the GEA 71. The technician should troubleshoot to
isolate the fault by checking sensor-to-GEA wiring, replacing the suspect sensor, and finally by replacing
the GEA 71. Replace one part at a time. Refer to Section 7.4.1 to check for correct operation of the
sensors and GEA 71 after any part has been replaced. Refer to G1000/GFC 700 Wiring Diagram and
Super King Air 300 or B300 Maintenance Manual (listed in Table 1-2) as needed.
Invalid Field
Sensor
Possible Solutions (for applicable engine/system)
ITT
•
Check thermocouple cable.
•
Replace thermocouple cable.
•
Replace GEA 71.
Torque
•
Check torque transmitter – GEA wiring.
•
Check power input to torque transmitter.
•
Replace torque transmitter.
•
Replace GEA 71.
Prop RPM
•
Check prop tachometer – Signal Conditioner wiring.
•
Check Signal Conditioner – GEA wiring.
•
Check power input to Signal Conditioner.
•
Replace prop tachometer sensor.
•
Replace Signal Conditioner. Refer to Section 6.22.
•
Replace GEA 71.
Turbine RPM
•
Check engine speed tachometer – Signal Conditioner wiring.
•
Check Signal Conditioner – GEA wiring.
•
Check power input to Signal Conditioner.
•
Replace engine speed tachometer sensor.
•
Replace Signal Conditioner. Refer to Section 6.22.
•
Replace GEA 71.
Fuel Flow
•
Check Signal Conditioner unit wiring.
•
Check power input to Signal Conditioner
•
Replace fuel flow transmitter.
•
Replace Signal Conditioner. Refer to Section 6.22.
•
Replace GEA 71.
Oil Pressure
•
Check oil pressure sensor – GEA wiring.
•
Replace oil pressure sensor.
•
Replace GEA 71.
Oil Temperature
•
Check oil temperature sensor – GEA wiring.
•
Replace oil temperature sensor.
•
Replace GEA 71.
Summary of Contents for Cessna Caravan G1000
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