In manual mode, the HMU provides altitude biased and slew rate limited fuel flow as a function of power level angle. Lubrication System - The lubrication system is a circulating dry sump type with an external reservoir and heat exchanger mounted and furnished by the airframe manufacturer. A gear-type pressure and scavenge pump assembly is mounted within the gearbox. The system derives its input power from an airframe furnished 14-29 Vdc power source. The ignition system transfers energy to the combustible fuel mixture.
Energy is provided in the form of high temperature-high voltage arcs at the spark igniter gaps.
These arcs ignite the fuel mixture. The voltages of the four thermocouples are electrically averaged in the assembly. The engine electrical harness and the aircraft indicator harness connect to this junction box. The compressor inlet guide vanes and front bearing support hub are the only engine components with anti-icing provisions. Anti-icing is provided by the use of compressor discharge air which is taken through a valve on the compressor scroll.