3-8. Using Gas Turbine Engine Analyzer During Troubleshooting
Gas Turbine Engine Analyzer. The gas turbine engine analyzer provides instrumentation for checking the engine
electrical, hydraulic, and control air systems and for controlling and monitoring engine operation during troubleshooting or
checking procedures after repair. The analyzer includes a separate portable fuel pressure gage and gage saver, a
multimeter, and special cable assemblies, all of which are stored in the analyzer case. The analyzer control panel is
shown in figure 3-3. The analyzer cables, and a special purpose cable assembly required to connect the analyzer to the
power unit are shown in figure 3-4. An overlay plate, part of the special purpose cable assembly, which must be installed
on the analyzer panel to provide connection nomenclature, is shown in figure 3-4.
Connection of Gas Turbine Engine Analyzer to Power Unit. Connect the analyzer to the power unit as shown in
figure 3-5 while observing the following.
Place analyzer (fig. 3-5) in a convenient position near the left side of the power unit to facilitate
connections. Insure that all analyzer switches are in OFF or spring-loaded position.
Install main receptacle of special purpose cable assembly on MAIN plug of analyzer panel (fig. 3-5). Install
overlay plate (fig. 3-4), attached to special purpose cable assembly, over analyzer indicator lights and switches locating
cutout in plate over READY TO LOAD LIGHT on analyzer panel (fig. 3-3) to provide correct identification of analyzer
lights, switches, and static test jacks.
Disconnect engine harness receptacle J36 from power plant plug P36 (fig. 3-5).
Connect engine plug
on special purpose cable assembly to engine harness receptacle J36 (fig. 3-5); connect power
plant P36 receptacle on special purpose cable assembly to power plant plug P36 (fig. 3-5).
Disconnect instrument panel harness receptacle J14 from power plant plug P14 (fig. 3-5). Connect
instrument panel plug on special purpose cable assembly to instrument panel harness receptacle J14 (fig. 3-5); connect
power plant P14 plug receptacle on special purpose cable assembly to power plant plug P14 (fig. 3-5).
Connect thermocouple receptacle on special purpose cable assembly to thermocouple plug on analyzer
panel (fig. 3-5).
Remove cap from acceleration limiter valve tee. Connect a control air plumbing line from open leg of tee
to AIR IN fitting on analyzer panel (fig. 3-5). Remove cap from AIR OUT fitting on analyzer panel (fig. 3-3).
Remove cap from fuel control governor cover port. Connect a fuel pressure plumbing line from the
governor cover port to FUEL fitting on analyzer panel (fig. 3-5).
The tee at the fuel solenoid valve outlet may also be used to read fuel pressure to the atomizer
but is not the preferred check point.
Static Check of Components. Perform static check of engine components as follows.
Place all analyzer switches in the OFF or spring-loaded position.
Place MASTER switch on power unit instrument panel (fig. 2-14) in RUN position to provide DC power to
Insert static test plug on special purpose cable assembly (fig. 35) in the appropriate test jack for the
component to be checked (as identified by the overlay plate fig. 3-4), actuate static check switch on special purpose
cable assembly (fig. 3-5). The component being checked may be heard or felt to actuate.
Note The multimeter provided with the analyzer may be connected in series with the static test lead and actuation of the
component being checked will be indicated on the multimeter ampere scale by current draw.
Functional Check Procedure. Perform functional check of power unit starting and operation as follows.
Place all analyzer switches, except motor rotate switch, in the ON or spring-loaded position.
Place power unit controls in normal local operating position with master switch (fig. 2-2) in RUN position.
Press in battery charging, turbine engine control, and generator control circuit breakers (fig. 2-22) on pow-