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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
Appx-37
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
The wing fuel tanks are fitted with many fuel temperature sensors; the left wing has
two and the right wing has three. With the Fuel Recirculation OFF, the Fuel
Management and Quantity Gauging Computer (FMQGC) reads all temperature sensor
but will display only the lowest temperature. When the Fuel Recirculation system is
ON, the FMQGC computer reads the inboard temperature sensor as it will be the one
who reads the highest temperature.
Operation of the Fuel Recirculation System is allowed only during cruise flight above
34,000 feet.
Display of system status is provided through EICAS messages. A L (R) FUEL
RECIRC FAIL caution message will be displayed on the EICAS status page when the
FRTT valve is not in the commanded or allowed position. Finally, the L (R) FUEL
RECIRC OFF status message will be displayed when the crew selects system off.
The FUEL HI TEMP caution message is posted when the bulkhead fuel temperature
exceeds 54°C when the Fuel Recirculation System is inoperative. To prevent the
system from operating above the freezing level, the set point has been reduced to 10°C
　
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