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A special fuel pump supplies fuel for APU startup when fuel feed pressure is low (due to
loss of tank pumps or loss of normal AC electrical supply). This pump normally runs off the
AC ESS SHED, but runs off the AC STAT INV BUS if the AC ESS SHED fails.
See also 1.70.40 "IDG COOLING SYSTEM".
Some of the fuel supplied to each engine goes from the high-pressure fuel line in that
engine, through the integrated drive generator (IDG) heat exchanger (where it absorbs
heat), to the fuel return valve, and to the outer fuel tank.
This operation ensures the IDG cooling when the oil temperature is high or when at low
engine power.
The FADEC controls the fuel return valve.
If the outer tank is already full, the fuel overflows to the inner tank through a spill pipe.
If center tankis feeding, the wing tank will tend to overfill and the system automatically
selects the CTR TK PUMP off when the inner tank is full. The wing tank pumps will feed
until the engine have used approximately 500 kg (1100 Ib) of fuel when the fuel level
reaches the underfull sensors. The logic circuits then restart the center tank pumps.
FUEL TANK
TO OUTER
  TANK
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━┳━━━━━━━━━━━┓
┃I  -~ A318                      ┃    FUEL    ┃1.28.10     P 7       ┃
┃  .*,,.8, ,, ~L,~ A319          ┃            ┃                      ┃
┃                                ┃            ┣━━━━━┳━━━━━┫
┃ Lli,~ A320                     ┃            ┃SEQ 203 I ┃I REV 24  ┃
┃      A~7-~'M" A321             ┃DESCRIPTION ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃            ┃          ┃          ┃
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One (two) refueling point(s) is (are) installed under the wings allowing the refueling from
either the right or left (<~]) side of the aircraft.
A refuel panel is located either on the fuselage side beneath the right wing or under the
right or left wing adjacent to the refuel coupling.
Another refuel panel is located on the cockpit overhead maintenance panel.
A "READY FOR FUELING" green light is installed adjacent to the refuel coupling.
COCKPIT
REFUEL PANEL
REFUEL PANEL    <~
REFUEL COUPLING<~
REFUEL PANEL    <~
A gallery connects the refuel coupling to the refuel valve of each tank.
Refueling is normally automatic, the required fuel load being set on the preselector.
Manual control is also available.
Automatic refueling starts by the outer cells. If the selected fuel load exceeds the wing tank
capacity, the center tank is refuelled simultaneously.
When an outer cell is full the fuel overflows into the inner cell through a spill pipe.
Refuel valves close automatically when the tanks contain the preselected load or when
sensors detect a high fuel level.
The aircraft can be refueled when only battery power is available.
The wing tanks can be refueled by gravity through refueling points on top of the wings.
A transfer valve between the engine feed system and the refueling gallery permits :
- tank pumps to transfer fuel from one tank to another.
- defueling through the refuel coupling.
Approximate refueling time at nominal pressure is :
- 17 minutes for wing tanks.
- 20 minutes for all tanks.
HI LEVEL
SENSOR
CCM ALL
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┃                                ┃                            ┃1.28.10     P 8       ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual3(127)