Fuel System Non Normals

Question 1

Fuel imbalance

Answer 1

Eg left more than right
Will be displayed on EICAS
AMBER FUEL IMBALANCE MSG
AMBER POINTER to tank/value with less fuel
Operate cross feed pump
Turn off lower quantity tanks fuel pumps

Left tank now feeding both engines
Monitor until imbalance correct
Amber msg blanks
Fuel balance flashes for a few seconds

Question 2

Fuel auto jettison EICAS msg

Answer 2

Auto fuel jettison shutoff is inop

Jettison continues to standpipe unless stopped by crew

Question 3

Fuel jettison sys msg

Answer 3

Fuel jettison system has failed

Question 4

Fuel jettison main msg

Answer 4

Main tank jettison system is failed
Jettison from main tank is stopped
There are no consequences for center tank jettison

Question 5

Fuel jettison nozzle

Answer 5

Respective jettison valve failed closed or open
If closed, jettison possible through other nozzle, fuel imbalance may occur
If open unitended jettison may occur

Question 6

Fuel press eng

Answer 6

Respective engine uses suction feed

Crossfeed may be necessary to prevent thrust decay

Question 7

Fuel qty low

Answer 7

Fuel qty low in either main tank

Crossfeed to prevent flameout

Question 8

Fuel pump center l

Answer 8

Respective pump switch is on with an empty tank or pump failed
Use crossfeed to prevent imbalance if center tank has fuel

Question 9

Fuel in center

Answer 9

Center tank pumps off with still significant amount of fuel in tank

Question 10

Fuel valve APU

Answer 10

APU fuel valve disagrees with commanded position