Bendix Fuel Control System Theory of Operation

Aviation Department Presents

Instructor: Terry Mooney

COPYRIGHT 2002, NORTHERN LIGHTS COLLEGE. ALL RIGHTS RESERVED. FOR USE OF THIS PRESENTATION PLEASE CONTACT NORTHERN LIGHTS COLLEGE AVIATION DEPARTMENT.

Principle ComponentsFuel pump

-receives fuel from airframe boost pumps-increases fuel pressure for use at the engine-receives bypass fuel from fuel control

Gas producer fuel control-regulates fuel pressure from pump-automatically schedules fuel from light off to idle-accelerates engine to operational speed-cuts off fuel flow to shut down engine

Power turbine governor-monitors power turbine speed-receives power input signals from collective lever-resets fuel control schedule to adjust gas producer in order to maintain power turbine at constant speed

Fuel nozzle-delivers scheduled fuel to combustion chamber

Input Parameters

Gas producer fuel control-fuel pressure from engine driven pump-gas producer turbine RPM-compressor discharge air pressure (Pc)-throttle position (twist grip) lever-power turbine governor reset pressures (Pr & Pg)-power turbine governor over-speed pressure (Py bleed)

Power turbine governor-power turbine RPM-compressor discharge air pressure-power lever (collective) position

Fuel nozzle-regulated fuel flow from fuel control