System Maintenance Manual

Page 4-16 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air

Revision F 190-00682-01

Pilot Compartment

• Top metal case of PFD 1: __________ milli-volts

• Top metal case of PFD 2: __________ milli-volts

• Top metal case of MFD: __________ milli-volts

• Top metal case of GMA 1347D #1: __________ milli-volts

• Top metal case of GMA 1347D #2: __________ milli-volts

• Top metal case of GCU 475: __________ milli-volts

• Top metal case of GMC 710: __________ milli-volts

• GEA 71 #1 body: __________ milli-volts

• GEA 71 #2 body: __________ milli-volts

• GDC 74B #1 body: __________ milli-volts

• GDC 74B #2 body: __________ milli-volts

• OAT 1 Probe base nut (inside fuselage): __________ milli-volts

• OAT 2 Probe base nut (inside fuselage): __________ milli-volts

• GDL 69A body: __________ milli-volts

• Engine Signal Conditioner #1 near mounting holes of case: __________ milli-volts

• Engine Signal Conditioner #2 near mounting holes of case: __________ milli-volts

• PC920 Fuel Flow Signal Conditioner (

if installed) near mounting holes of case: __ ___ milli-volts

• PFD1 Cooling fan metal base: __________ milli-volts

• PFD2 Cooling fan metal base: __________ milli-volts

• MFD Cooling fan metal base: __________ milli-volts

Cabin Compartment

• GSA 80 (Roll) Servo body: __________ milli-volts

Ensure that at each PFD or MFD test point, no more than 20 milli-volts (20 mΩ) are present. Ensure that

at each other test point, no more than 2.5 milli-volts (2.5 mΩ) are present. In this case, voltage is

equivalent to resistance (Ω), given that precisely 1 amp reference current is present.

TIP: If 1 amp reference current cannot be maintained, note the difference between the attainable current

and 1 amp reference current. Calculate the percentage difference and apply this to the voltage reading to

obtain the equivalent resistance. Example: If the measured current is 1.2 amps, (20% high from the target

1 amp current), then the allowable voltage measurement would be 20% high, 2.5 milli-volts would now

be 3.0 milli-volts.