1. Bendix Fuel Control System Theory of Operation
Aviation Department Presents
Bendix Fuel Control System
Theory of Operation
Instructor: Terry Mooney
COPYRIGHT 2002, NORTHERN LIGHTS COLLEGE. ALL RIGHTS RESERVED. FOR USE OF THIS PRESENTATION
PLEASE CONTACT NORTHERN LIGHTS COLLEGE AVIATION DEPARTMENT.

2. Principle Components Fuel 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

3. 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