Instruction Manual

Page 4-28 G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air
Revision 8 190-00915-01
4. Apply external power to aircraft and start the G1000 in normal mode.
5. Using the Thermocouple Calibrator (or equivalent), inject the DC signals specified in Table
4-14 and verify the indications are within specified tolerances. If the Thermocouple
Calibrator is not temperature compensated, use the chart shown in Figure 4-5 to convert the
ambient temperature to millivolts and subtract from Table 4-14.
Test Point (degC) DC signal (mV) Indication (degC)
200 8.137 200 +/- 17
400 16.395 400 +/- 17
600 24.902 600 +/- 12
800 33.277 800 +/- 7
1000 41.269 1000 +/- 12
1200 48.828 1200 +/- 17
Table 4-14, ITT Indication Test Points
6. On the right hand circuit breaker panel, open the GIA1 (PRI) and GIA1 (SEC) circuit
breakers, and verify the last observed ITT indication remains unchanged. Reset the the GIA1
(PRI) and GIA1 (SEC) circuit breakers.
7. Repeat steps 1 through 5 using the right hand engine thermocouple junction block.
8. Pull the GIA 2 circuit breaker, and verify the last observed ITT indication remains
unchanged. Reset the GIA 2 circuit breaker.
9. Remove power from aircraft and reconnect all thermocouple wires to the junction blocks.
Figure 4-5, Ambient Temperature Conversion Chart