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AND OPERATION
CONTENTS:
General
Refuel/Defuel Control Panel
Refuel/Defuel Coupling
Refuel Valves and Refuel Gallery
Spill Pipes
Diffusers
Air Inlet and Drain Valves
Defuel/Transfer Valve
Pressure Relief Valves
High Level Sensors
Overwing Refueling Points
Self Examination
TMUFUKH01 LEVEL 3
EFFECTIVITY 28-25-00 Page 1
Oct 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 189
ALL
REFUEL/DEFUEL SYSTEM DESCRIPTION AND OPERATION
GENERAL
The Refuel/Defuel system controls the fuel flow into
or out of the aircraft. Automatic Refueling, manual
refuel, defuel or ground transfer are controlled from
the Refuel/Defuel control panel, installed on the belly
fairing.A Refuel/Defuel coupling, also installed in
the leading edge of the wing, is the interface between
the Refuel/Defuel system and the external fuel source.
Wing tank gravity refueling is possible.To fill the
fuel tanks to their maximum capacity, the aircraft
must be level.During an automatic refueling, the
refueling of each fuel tank is controlled by the Fuel
Quantity Indicating Computer (FQIC).The main fuel
pumps are used to defuel the aircraft. The
defuel/transfer valve and the crossfeed valve must be
open.
REFUEL/DEFUEL CONTROL PANEL
The primary components on the refuel/defuel control
panel are:
- the control panel
- the fuel quantity preselector
- the fuel quantity indicator.
When the quick-release door of the Refuel/Defuel
control panel is opened, it operates a microswitch
which sends a signal to the FQIC and connects the 28VDC
supply to the Refuel/Defuel electrical circuits.
REFUEL/DEFUEL COUPLING
The Refuel/Defuel coupling supplies the wing tanks and
the center tank. When not in use, the coupling is
fitted with a pressure blanking cap.The Refuel/Defuel
coupling has a standard 2.5 inch adaptor flange.The
coupling ring has a break-away groove around its
circumference. This prevents damage to the aircraft
structure if a sideways force is applied.
REFUEL VALVE AND REFUEL GALLERY
Each refuel valve, one per tank, is the interface
between the refuel gallery and the related fuel
tank.The valve is controlled by a solenoid which, when
energized and a refuel pressure is supplied,opens the
valve.The refuel gallery is a fuel line that connects
all the refuel valves together.
SPILL PIPES
During a refuel operation, the outer cell is filled
first. When it is full, fuel flows into the inner cell
through the spill pipe which connects the two cells
together.
DIFFUSERS
The diffusers, installed on refuel lines, diffuse fuel
into the tanks with minimum turbulence and
electrostatic build up.
TMUFUKH01-T01 LEVEL 3
EFFECTIVITY 28-25-00 Page 2
Oct 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 190
ALL
REFUEL/DEFUEL SYSTEM DESCRIPTION AND OPERATION
TMUFUKH01-P01 LEVEL 3
EFFECTIVITY 28-25-00 Page 3
Oct 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 191
ALL
AIR INLET AND DRAIN VALVES
The air inlet valve lets air into the refuel gallery
after refueling. Thus fuel can drain from the refuel
gallery through the fuel drain valve.A pipe extends
from the air inlet valve to the outboard side of RIB
21. This pipe makes sure that the air inlet remains
above the fuel level at all times.This stops the
movement of fuel from one wing tank to another by
gravity.
The fuel drain valves are closed by fuel pressure in
the refuel gallery. When the pressure source is
removed, the valve opens to allow fuel to drain from
the refuel gallery into the wing tank.
DEFUEL/TRANSFER VALVE
The defuel/transfer valve connects the main fuel pump
system to the refuel gallery. When open, the valve
permits the fuel in the main fuel pump system to be
moved into the refuel gallery.The valve is controlled
by the MODE SELECT switch on the Refuel/Defuel control
panel.
PRESSURE RELIEF VALVE
The pressure relief valve releases fuel into the right
hand wing tank if a center tank overflow occurs.
HIGH LEVEL SENSOR
One high level sensor is installed in each tank.When
the high level sensor is immersed in fuel, the Fuel
Level Sensor Control Unit (FLSCU) receives this state,
amplifies this signal to control the refuel valve to
　
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