System Maintenance Manual

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 4-31
190-00682-01 Revision G
4.11 Engine Data Check
Do the following to verify the engine data availability and validity for torque, ITT, and oil pressure.
Required test equipment is provided in the table below.
Test Equipment Make/Requirement Model/Part Nbr
Decade Box 0-1k ohms As appropriate
Signal Generator 0-10Vdc / 0 – 1k Hz As appropriate
Torque
1. Using a signal generator, inject a DC signal into the No. 1 GEA via left engine firewall
connectors-pins J102-C (HI) and J102-R (LO).
2. Simulate the following voltages, and verify the indication and status:
Test Point (Vdc) Indication (ft-lbs) Status Configurations
0.00 +/- .02 0
bottom of green band
Green digital
all
2.53 +/- .02 1320
red digital*
NOTE: red radial 1315
4-10, 21-22
2.90 +/- .02 1525
red digital*
NOTE: red radial 1520
1-3, 14-20
3.15 +/- .02 1655
red digital*
NOTE: red radial 1650
11-13
(*) steady after 5 seconds
3. On the right hand circuit breaker panel, open the GIA1 (PRI) and GIA1 (SEC) circuit
breakers, and verify the last observed torque indication remains unchanged.
4. Close the GIA1 (PRI) and GIA1 (SEC) circuit breakers, and wait until the COM1 and
NAV1 fields are valid.
5. Repeat steps 1 and 2 using the No. 2 GEA via right engine firewall connectors-pins J103-C
(HI) and J103-R (LO).
6. Pull the GIA 2 circuit breaker, and verify the last observed torque indication remains
unchanged.
7. Close the GIA 2 circuit breaker, and wait until the COM2 and NAV2 field are valid.
ITT
8. Remove left engine ITT thermocouple terminals from sensor. Using a signal generator,
inject a DC signal into the No. 1 GEA via left engine firewall connectors-pins, as follows:
S/N LJ-1063 thru LJ-1360, LJ-1362: J104-T* (LO) and J104-W* (HI)
S/N LJ-1361, LJ-1363 and after: J104-P* (LO) and J104-S* (HI)
9. Simulate the following voltages, and verify the indication and status: