ENGINE FUEL CONTROL -OPERATION
Fire Switch
The fire switch permits FMU control power to go to the ERU when the switch is in its normal position (in). If the switch is out, power connects directly to the FMU cutoff solenoid to stop metered fuel flow to the injectors. It also closes the engine fuel spar valve.
See the fire protection chapter for more information about the fire switches (CHAPTER 26).
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ENGINE FUEL CONTROL -OPERATION
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ENGINE FUEL INDICATING -INTRODUCTION
Purpose
The engine fuel indicating system supplies fuel flow and filter bypass data to the EEC. The EEC transmits this data to the AIMS.
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ENGINE FUEL INDICATING -FUEL FLOW
Purpose The fuel flow indicating system measures the engine fuel flow rate. It also supplies the airplane with the information for indication and flight management. The flight management computing function of the AIMS uses the data to calculate fuel-used data. The control display unit (CDU) shows this data on the CDU progress page 2.
Fuel Flow Transmitter
The fuel flow transmitter attaches to the HPC case on the right side of the engine at approximately the 4:00 position. Fuel flows from the FMU to the front of the transmitter. The fuel distribution valve attaches to the rear of the transmitter.
The transmitter does not have a motor. It sends analog pulse signals to the EEC that are in proportion to the engine fuel mass flow rate.
Functional Description
The EEC uses the signals from the fuel flow transmitter to calculate an engine fuel mass flow rate. The EEC sends this data to the EDIU.
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