It is mounted on the flange at the compressor end, and, unlike the Lucas GTS, continues to rotate with the turbine shaft during operation. Some of the oil fittings were also missing, and have been replaced using commercially available Metric Parker-Hannefin parts. Thanks to Lee Palmer's keen eyes, a couple of extremely weather beaten Microturbo test stands came to light during a trip to an aircraft dismantlers, providing the essential parts of both the fuel and lubrication systems for this turbine. Oil is stored in the frame mounted tank, and pumped through filters to the turbine and starter gearbox bearings. Oil pressure is maintained by a PRV in the oil pump housing.
Fuel is fed from an independent fuel tank via a bowl filter to the pump.
Fuel pressure is maintained by a second PRV in the fuel pump housing. Fuel is fed to the burners, where the spill valve in the burner fuel return controls the percentage of fuel fed to the burners, or spilled back to the fuel tank. This provides sequenced starting, and eventually closed loop rotor speed control. The speed set point is backed off if the EGT exceeds a set temperature to provide acceleration control. The error signal from the control loop adjusts the PWM drive signal to the spill valve.