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controlled to open (fuel transfer operation), provided
there is fuel in the center tank.
The difference between full and underfull level sensors
is equal to a fuel quantity of 500 kg (1100 lbs).
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FUEL LEVEL SENSING
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FUEL LEVEL SENSING
OVERFLOW LEVEL
When full level is reached in the wing tank and
overflows into the vent surge tank, the overflow sensor
sends a signal to the Engine Interface Unit (EIU) to
close the Fuel Return Valve (FRV).
TEMPERATURE SENSOR
The temperature sensor commands the closure of the
Fuel Return Valve, through the ECU, when the
temperature of the fuel in the wing exceeds the limits
(52.5 degrees C).
IDG SHUT-OFF SENSOR
The FLSCUs signal the FADEC to close the Fuel Return
Valve.
If the fuel level is below 280 kg (616 lbs), the IDG
shut-off sensor stops the IDG cooling.
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SELF EXAMINATION
What is the purpose of the IDG SHUT-OFF sensor?
A - To stop the cooling fuel recirculation.
B - To stop the center tank transfer valves.
C - To restart cooling fuel recirculation.
In which tanks are temperature level sensors fitted?
A - Center tank.
B - Wing tanks and center tank.
C - Wing tanks.
What happens if a high level is detected?
A - A warning is triggered: too much fuel.
B - The corresponding refuel valve closes.
C - All the refuelling operations are
stopped.
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28 - FUEL SYSTEM
28-42-00 FUEL QUANTITY INDICATING SYSTEM
COMPONENTS
CONTENTS:
Fuel Quantity Probe
Ultracomp
Dualcomp
Fuel Quantity Preselector
Multi-Tank Indicator
FQIC
Memory Module
Magnetic Level Indicator
Attitude Monitor
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FUEL QUANTITY INDICATING SYSTEM COMPONENTS
SAFETY PRECAUTIONS
WARNING: Before you refuel or defuel the aircraft you
must make the area around it safe.
In the safety area, do not:
- smoke
- make sparks or fire
- use equipement which is not approved for
Refuel/Defuel procedures.
AIRCRAFT FUEL IS FLAMMABLE.
FUEL QUANTITY PROBE
IDENTIFICATION
FIN: 21QT to 38QT, 51QT to 61QT
LOCATION
ZONE: 540, 640, 141, 142
COMPONENT DESCRIPTION
The fuel probes are installed to make sure that at
least one probe is always in the usable fuel.
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FUEL QUANTITY INDICATING SYSTEM COMPONENTS - FUEL QUANTITY PROBE
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FUEL QUANTITY INDICATING SYSTEM COMPONENTS
ULTRACOMP
IDENTIFICATION
FIN: 50QT, 52QT
LOCATION
ZONE: 141, 640
COMPONENT DESCRIPTION
There are two ultracomps, one in the lowest part of
the center tank and one in the lowest part of the wing
tank.
The ultracomp houses 3 sensors:
- parallel plate capacitor.
- velocimetor.
- temperature sensor.
The parameters given by these 3 sensors are used by
the FQIC for fuel mass calculation.
　
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