4K-6 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
After the air/oil cooler, the oil flow splits. One flow continues to
the No. 6 bearing sump and the No. 4 and 5 bearing cavity; the
other goes to the accessory drive gearbox assembly and the
fuel/oil cooler.
In the fuel/oil cooler, a bypass valve opens and closes to pro-
vide additional cooling above a temperature of 99×C (210×F).
Downstream of the fuel/oil cooler, pressure and temperature
transmitters provide inputs for the oil and temperature gages.
After flowing through the fuel/oil cooler, oil then flows to the
engine’s No. 1, 2, and 3 bearings and the fan planetary gear
case.
After the oil lubricates, cools, and cleans the engine, the oil
pump scavenge elements draw oil from the bearing sumps,
cavities, and casings and return it to the oil tank.
Ignition System
With the STA RT/GEN switch in STA RT, advancing the throttle
levers out of the cutoff position supplies 28V DC to the ignition
exciter box through the throttle quadrant switch. The ignition
exciter box operates and supplies 18,000 to 24,000 volts to fire
the two igniter plugs.
As the engine reaches idle speed, the EEC terminates ignition
at approximately 45% N
2 RPM by opening the start relay.
Placing the AIR IGN switches in the on position supplies 28V
DC for continuous ignition system operation. During ignition
system operation, the light above the AIR IGN switch illumi-
nates to indicate power to the ignition system; the light does not
indicate system operation.
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