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into the Inner cell through a spill pipe.
PUMP LOGIC
As long as fuel is being delivered from the center
tank, the wing tanks are still full and will tend to
overfill, as the returned fuel is delivered to the
wings tanks. In this case the center tank pump stops
when the inner cell reaches the FULL level.
The wing tank pumps will operate until approximately
1100 lbs (500 kg) of fuel have been used i.e.: underfull
sensors reached. The logic circuit then restarts the
Center tank pump.
FRV CLOSURE : LOW LEVEL
The fuel return valve closes when the fuel level in
the inner cell drops to the low level sensors.
Note: The low level sensor i.e. IDG shut-off sensor
(38QJ) signals the return valve to close at 620
lbs (280 kg).
Note : Closing the return valve will reduce the amount
of unuseable fuel.
TMUFUEH01-T01 LEVEL 3
EFFECTIVITY 28-16-00 Page 2
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 80
ALL
TMUFUEH01-P01 LEVEL 3
FUEL IDG COOLING SYSTEM PRESENTATION
EFFECTIVITY 28-16-00 Page 3
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 81
ALL
FUEL IDG COOLING SYSTEM PRESENTATION
FRV CLOSURE : INNER CELL HIGH TEMPERATURE
The fuel return valve closes if the fuel temperature
is too high in the inner cell (52.5 degrees C).
As the returned fuel is hot, the FLSCU prevents
temperature limitation exceedance.
In this case, the FLSCU sends an inhibition signal to
the FADEC for FRV closure.
FRV CLOSURE : OUTER CELL HIGH TEMPERATURE
The fuel return valve closes if the fuel temperature
is too high in the outer cell (55 degrees C).
This prevents a large volume of high temperature fuel
from entering the inner cell, in the event of intercell
valve opening.
This also keeps the fuel temperature at an acceptable
level should a tank rupture occur.
FRV CLOSURE : PUMP PRESSURE LOSS
The fuel return valve closes if a low pressure is
signalled by all pumps of one wing supplying the
related engine and crossfeed valve closed, or if a low
pressure is signalled by all pumps of both wings with
crossfeed valve opened.
This is to reduce fuel flow and allow maximum available
pressure for fuel burn during gravity feeding.
Low pressure is sensed by the pump low pressure switch
and signalled to the fuel level sensing control units
(FLSCUs).
FRV CLOSURE : OVERFLOW
The fuel return valve closes if the center tank pump
fails to respond to the logic signals of the full
sensors, causing the wing tank to overflow into the
vent surge tank.
TMUFUEH01-T02 LEVEL 3
EFFECTIVITY 28-16-00 Page 4
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 82
ALL
FUEL IDG COOLING SYSTEM PRESENTATION
TMUFUEH01-P02 LEVEL 3
EFFECTIVITY 28-16-00 Page 5
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 83
ALL
FUEL IDG COOLING SYSTEM PRESENTATION
SELF EXAMINATION
To which tank does the recirculated fuel return ?
A - Wing tank outer cell,
B - Center tank,
C - Wing tank inner cell.
What happens if the fuel level in the inner cell
drops to the low level sensor ?
A - The Fuel Return Valve closes,
B - The Fuel Return Valve opens,
C - The center tank pumps start.
TMUFUEH01 LEVEL 3
EFFECTIVITY 28-16-00 Page 6
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 84
ALL
28 - FUEL SYSTEM
28-11-00 WATER DRAIN VALVE OPERATION
CONTENTS:
General
Job Set Up
Drain Procedure
Close Up
TMUFUEU01 LEVEL 2
EFFECTIVITY 28-11-00 Page 1
Nov 30/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 85
ALL
WATER DRAIN VALVE OPERATION
GENERAL
Water which collects beneath the fuel in the lowest
parts of the wing tanks is drained away through small
bore pipes connected to manually
operated water drain valves.
To drain remaining fuel and water:
WARNING: DO NOT GET AIRCRAFT FUEL:
- IN YOUR MOUTH,
- IN YOUR EYES,
- ON YOUR SKIN FOR A LONG TIME,
AIRCRAFT FUEL IS POISONOUS.
　
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