Engine Data Check; Table 4-11, Engine Data Check Test Equipment; Table 4-12, Itt Indication Test Points - Garmin G1000 System Maintenance Manual

4.11

Engine Data Check

Accomplish this section to verify the engine data availability and validity for ITT and torque. Remove
the left and right engine cowling (Ref. Super King Air 300 or B300 Maintenance Manual, Chapter 71-10-
00) to gain access to the engine harness connectors. Required test equipment is provided in Table 4-11.
Any product conforming to the specification listed may be used.
4.11.1 ITT
1. Remove power from aircraft.
2. Disconnect all thermocouple wires except for the Alumel-Green #10 and Chromel-White #8
leads from the left hand engine thermocouple junction block mounted to the gas generator
case. (Ref. Super King Air 300 or B300 Maintenance Manual, Chapter 71-00-00)
3. Connect the Thermocouple Calibrator (or equivalent) across the Alumel-Green #10 and
Chromel-White #8 leads of the thermocouple junction block. Make sure the polarity of the
Alumel and Chromel leads are strictly observed when making connections.
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
4-12 and verify the indications are within specified tolerances. If the Thermocouple
Calibrator is not temperature compensated, use the chart shown in Figure 4-4 to convert the
ambient temperature to millivolts and subtract from Table 4-12.
Test Point (degC)
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.
Page 4-26
Revision 4
Test Equipment
Signal Generator
Thermocouple Calibrator

Table 4-11, Engine Data Check Test Equipment

DC signal (mV)
200
400
600
800
1000
1200

Table 4-12, ITT Indication Test Points

G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Requirement
0-10Vdc / 0 – 1k Hz
K-type, 200 to 1,200°C
Indication (degC)
8.137 200 +/- 17
16.395 400 +/- 17
24.902 600 +/- 12
33.277 800 +/- 7
41.269 1000 +/- 12
48.828 1200 +/- 17
190-00716-01