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gear when selected DOWN with aircraft on jacks.
This signal is used to provide electrical supply to
the FQIC in this specific configuration.
ADIRU 1/2
Acceleration data is received from the Air Data
Inertial Reference System during flight and is used
as an alternate source of attitude.
Normally, effects of attitude, changes in
acceleration, effective pitch and roll angles, are
calculated from the height of fuel at each probe and
the knowledge of the tank geometry stored in the
computer memory.
CFDS
ARINC 429 output links transmit BITE information from
the Computer to the Centralized Fault Display System.
The Centralized Fault Display System (CFDS) monitors
fault conditions and BITE.
FMGCs
Fuel parameters are sent to the Flight Management and
Guidance Computers, for navigation computations.
ECAM
Total and individual tank fuel mass information is
sent to the ECAM displays.
TMUFUEB03-T01 LEVEL 3
EFFECTIVITY 28-42-00 Page 4
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 322
ALL
SELF EXAMINATION
What happens if one channel of the FQIC fails ?
A - Half of the Quantity Indicating data is
no longer available.
B - FQIS operates normally, only CFDS report
will indicate failure.
C - Fuel warning is triggered in addition of
CFDS report.
What happens if a quantity probe fails ?
A - Corresponding tank quantity display
flashes.
B - Quantity indication disappears.
C - Quantity indication remains the same.
TMUFUEB03 LEVEL 3
EFFECTIVITY 28-42-00 Page 5
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 323
ALL
THIS PAGE INTENTIONALLY LEFT BLANK
TMUFUEB03 LEVEL 3
EFFECTIVITY 28-42-00 Page 6
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 324
ALL
28 - FUEL SYSTEM
28-46-00 FUEL LEVEL SENSING
CONTENTS:
General
High Level
Low Level
FulL Level
Underfull Level
Overflow Level
Temperature Sensor
IDG Shut-Off Sensor
Self Examination
TMUFUEC03 LEVEL 3
EFFECTIVITY 28-46-00 Page 1
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 325
ALL
FUEL LEVEL SENSING
GENERAL
The aircraft is equipped with two multi-channel Fuel
Level Sensing Control Units (FLSCUs) and a third one,
if the Additional Center Tank (ACT) is installed.
They provide high fuel level sensing, low fuel level
sensing, full fuel level sensing, underfull fuel level
sensing, overflow level and temperature sensing.
Fuel level and temperature sensors feed signals to
the multi-channel amplifiers.
The FLSCUs detect and amplify the signals and trigger
switching functions in the appropriate circuits.
HIGH LEVEL
The high level sensors, when immersed in fuel, command
the closure of the associated tank refuel valve when
the MODE SELECT switch is set to the REFUEL position.
Wet high level sensors cause the associated:
- tank refuel valves to shut,
- blue HIGH LEVEL lights to come on, on the
refuel/defuel control panel (800 VU).
Wet center tank high level sensor causes fuel transfer
from optional ACT to center tank to stop.
LOW LEVEL
The center tank low level sensors control the automatic
transfer of fuel from the center tank to the wing
tanks. When sensors become dry for 5 minutes, the
FLSCUs send a close signal to the related control
valve.
4 low level sensors are used in each wing tank:
- 2 in each wing for 1500 kg (3307 lbs) fuel
level (exposure to air more than 30s: low fuel
level advisory on the memo page).
- 2 in each wing for 750 kg (1653 lbs) fuel level
(exposure to air more than 30s: low fuel level
warning on ECAM).
Exposure of the optional ACT low level sensors causes
the fuel FWD transfer to stop.
FULL LEVEL
When the full level is reached in one wing tank, the
center transfer valve closes to stop fuel transfer
operation from the center tank to the wing tank until
the fuel level in the wing tank reaches the underfull
level.
The fuel level sensors monitor the IDG fuel cooling
recirculation.
UNDERFULL LEVEL
When the fuel level in the wing tanks drop to the
underfull sensors, the center tank transfer valves are
　
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