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lateral balance is achieved.
NOTE
It is important that the crew monitor system operation in this
mode, since crossfeed will continue until manually deselected.
In the event that a lateral fuel imbalance occurs outside design limits, it will be
annunciated on EICAS, prompting the crew to take action.
The FUEL synoptic page below represents the fuel crossfeed mode (backup) of
operation. The system is shown with the crossfeed shutoff valve selected open, left
auxiliary pump inhibited, left forward and aft boost pumps inhibited, and both engines
running.
P P P
P
P P
P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
112OOLBS
56OOLBS
AUX
OLBS
56OOLBS
FUEL USED
296OOLBS
LO PRESS
32°C 32°C
LO PRESS
L
WING FEED
INHIBIT
AUX PUMP
OFF
PRI PUMPS
OFF
Crossfeed Shutoff
Valve
Crossfeed shutoff
valve is selected
open by the switch
on the fuel control
panel.
GX_appx_018
XFEED SOV
FAIL
OPEN
For Training Purposes Only
Sept 04
Appx-35
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
APU FUEL FEED
The APU start capability is normally provided by the DC AUX pump(s). The fuel
supplied to the APU is taken from the right engine feed line. The APU can also be fed
from the left engine feed line using the left DC AUX pump (powered by DC ESS bus)
and opening the crossfeed shutoff valve (BATT bus). A motor operated fire shutoff
valve is used in the APU feed line, in order to isolate the flow of fuel to the APU in
case of a fire or rotor burst.
The FUEL synoptic page top view represents the APU during the starting sequence,
with the DC pump running and battery power only as the single source of electrical
power. In the lower view, the APU is fed from the right engine feed line using the AC
pumps.
P P P
P
P P
P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
353OOLBS
146OOLBS
AUX
61OOLBS
146OOLBS
FUEL USED
3OOLBS
LO PRESS
32°C 32°C
LO PRESS
P P P
P
P P
P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
353OOLBS
146OOLBS
AUX
61OOLBS
146OOLBS
FUEL USED
3OOLBS
LO PRESS
32°C 32°C
LO PRESS
: APU starting and
left and right engines
are off.
Note
:
APU on speed, left
and right engines on,
and AC electrics
established.
Note
TOP VIEW
LOWER VIEW
APU Feed
Shutoff
Valve
APU – green outline
indicates on-speed.
GX_appx_019
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
Appx-36 For Training Purposes Only
Sept 04
FUEL RECIRCULATION SYSTEM
The Fuel ReCirculation system is designed to prevent the bulk fuel temperature from
reaching the freezing point by recirculating heated fuel to the wing fuel tank. The
FMQGC will turn on recirc when the altitude is > 34,000 feet, AND the bulk
temperature drops below – 20°C, or average temperature drops below – 9°C, and turn
off recirc when the bulk temperature reaches 5°C or altitude is < 33,800 feet, or either
engine is turned off. It will turn both sides on or off at the same time.
Cold fuel circulated through the Fuel Cooled Oil Cooler (FCOC) where the heat from
the engine oil is transferred to the fuel. The Fuel Return To Tank (FRTT) valve allows
the heated fuel to return to the wing fuel tank.
When the FRTT valve is open, fuel returns to the wing tank through the recirculation
line. Heated fuel is then distributed to the number 1 and 2 cell of the wing fuel tank.
No fuel is distributed to the number 3 cell as it will have emptied before the local fuel
temperature reaches – 40°C (F). The recirculation line is fitted with a check valve to
prevent crossflow or fuel propagation due to a ruptured line.
P
P
P
P
P
P
TS TS
TS
TS
TS
P P
FCOC FCOC
CELL3
CELL2
CELL1
CENTER TANK
Center Transfer Pump
Wing Transfer Shutoff Valve
Auxilliary DC Pump
Bulk Fuel
Temperature
Heated Fuel
Temperature
Sensor TS Fuel-Return-to-Tank
Valve
Recirculation Line
Main AC Pumps
Engine Feed
Shutoff Valve
GX_appx_020
For Training Purposes Only
Sept 04
　
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