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tank is induced back into the outer cell by a scavenge
jet pump using motive power from the wing fuel pumps.
WING TANK VENTING SYSTEM
Each wing tank inner and outer cells vent to the related
vent surge tank. The vent lines are fitted with a vent
float valve.
The ducts are large enough to ensure that if the
pressure refuelling shut-off failed, excess fuel can
be discharged overboard through the NACA intake.
A rubber check valve installed in the vent line allows
any fuel that finds its way into the vent lines to
drain back into the tank.
CENTER TANK VENTING SYSTEM
The center tank vents into the left hand vent surge
tank.
The center tank vent line is a conventional open line,
large enough for airflow, which is provided with a
check valve.
OVERPRESSURE PROTECTION
Overpressure protectors are installed in the system
to relieve pressure in the tanks that might occur
through vent blockage or a pressure refuelling gallery
failure.
An excess pressure in the outer cell relieves fuel
into the inner cell via an overpressure protector
mounted on rib 15.
An excess pressure in the inner cell or in the Vent
surge tank relieves fuel overboard via an overpressure
protector installed on a tank access panel.
The center tank overpressure protector relieves fuel
into the left inner cell.
VENT FLOAT VALVES
Two vent float valves prevent fuel from passing in the
vent lines during aircraft bank manoeuvres.
The open ends of the ducts and the vent float valves
which permit air to vent but not fuel, are positioned
at the optimum levels for refueling and normal
ground/flight manoeuvers.
A vent float valve fitted to the outer side of sealed
rib 15 permits air to be vented from the outer cell
to the inner cell during flight manoeuvers.
TMUFUEG01-T01 LEVEL 3
EFFECTIVITY 28-12-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 76
ALL
VENTING SYSTEM DESCRIPTION/OPERATION
TMUFUEG01-P01 LEVEL 3
EFFECTIVITY 28-12-00 Page 3
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 77
ALL
SELF EXAMINATION
An excess pressure in the inner cell is relieved
via an overpressure protector:
A - Into the Outer cell.
B - Into the Center tank.
C - Overboard.
The Vent Float Valves:
A - Prevent fuel from entering the vent
lines.
B - Allow fuel to drain from the vent lines.
C - Maintain the fuel tanks pressurized.
TMUFUEG01 LEVEL 3
EFFECTIVITY 28-12-00 Page 4
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 78
ALL
28 - FUEL SYSTEM
28-16-00 FUEL IDG COOLING SYSTEM
PRESENTATION
CONTENTS:
Principle
Fuel Return
Pump Logic
Fuel Return Valve Closure : Low Level
Fuel Return Valve Closure : Inner Cell High Temperature
Fuel Return Valve Closure : Outer Cell High Temperature
Fuel Return Valve Closure : Pump Pressure Loss
Fuel Return Valve Closure : Overflow
Self Examination
TMUFUEH01 LEVEL 3
EFFECTIVITY 28-16-00 Page 1
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 79
ALL
FUEL IDG COOLING SYSTEM PRESENTATION
PRINCIPLE
The Integrated Drive Generator oil is cooled by fuel;
a recirculation system is installed.
Some fuel supplying the engines is used to cool the
IDG oil. A return valve allows the hot fuel to be
returned to the Outer cell.
The Return valve opens at low engine fuel flow if the
engine oil temperature is above 93 degrees C.
The return valve mixes the hot fuel with cold fuel
from the LP pump to maintain the temperature of the
returned fuel below 100 degrees C.
FLSCU1 and ECU1 control the recirculation system in
the left wing.
FLSCU2 and ECU2 control the right wing system.
FUEL RETURN
The recirculated fuel is sent to the outer cell through
a check valve and a pressure holding valve in order
to prevent the fuel from boiling.
The pressure holding valve maintains a pressure of 18
psi in the return line; if the pressure increases,
fuel bleeds through the valve into the Outer cell.
The check valve prevents fuel flow from the wing tank
to the engine when the recirculation system is not in
operation.
Note: When the Outer cell is full, the fuel overflows
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