W DOC AIRBUS | AMM A320F

INDICATING - DESCRIPTION AND OPERATION

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1. General
F Indicating - Location ** ON A/C NOT FOR ALL
The fuel system is monitored from:
  • The fuel flow indication on the upper ECAM display unit permanently displayed in green and under numerical form.
  • The fuel filter clogging caution (amber) on the lower ECAM display unit associated with the MASTER CAUT light and the aural warning (single chime).
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2. Fuel Flow Indication
A. Fuel Flow Indication
The fuel flow indication is provided on the uper ECAM display unit.
F Fuel Flow Indication ** ON A/C NOT FOR ALL
The fuel flow transmitter signal is fed to the FADEC which processes it and transmits the information to the ECAM system for display through the digital FADEC data bus
F Fuel Flow Indication Schematic ** ON A/C NOT FOR ALL
B. Fuel Flow Transducer
(1) General
  • The fuel flow transmitter is mounted at 4 o'clock on the engine next to the accessory gearbox and does not require an electrical power input. The maximum flow across this transmitter is 6360 kg.hr (14000 lb.hr). The operating principle is to create a vortex fuel flow that drives the rotor.
(2) Operation
  • The fuel flows across a turbine equipped with a return spring which counteracts the torque resulting from the fuel flow. The turbine angular setting varies so that the return spring torque balances the fuel rotation moment. This provides measurement of fuel mass flow. At each rotation two permanent magnets mounted on the rotor and the turbine pass in front of two coils and generate two pulses. The lapse of time between these two pulses enables direct measuring of the mass fuel-flow.
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3. Fuel Filter Clogging Indication
A. Fuel Filter Clogging Indication
F Fuel Filter Clogging - Indication ** ON A/C NOT FOR ALL
F Fuel Filter Clogging - Schematic ** ON A/C NOT FOR ALL
The fuel filter clog indication is provided on the lower ECAM display unit. When the pressure loss in the fuel filter exceeds 11.5 psi (0.79 bar) plus or minus 2 psid (0.14 bar), the pressure switch is energized. This causes:
  • The engine page to come on the lower ECAM DU with the caution signal FUEL CLOG.
  • The associated caution message to come on the upper ECAM DU.
    F Fuel Filter Clogging - Indication ** ON A/C NOT FOR ALL
When the pressure loss in the filter decreases below 8.5 psid (0.59 bar), the pressure switch is de-energized which causes the caution to go off.
The differential pressure switch signal is fed directly to the SDAC through the hardware.
F Fuel Filter Clogging - Schematic ** ON A/C NOT FOR ALL
B. Fuel Filter Differential Pressure Switch
F Fuel Filter Differential Pressure Switch ** ON A/C NOT FOR ALL
  • The fuel filter differential pressure switch is located on the fan case. It is installed on the fan case with 3 bolts. The specifications are as follows:
  • Actuation:
    increasing pressure 11.5 psi (0.79 bar)
    decreasing pressure 8.5 psi (0.59 bar)
[Rev.10 from 2021] 2026.04.01 02:59:52 UTC
"Aviabrain" 2025