Fuel System

Question 1

CENTER FUEL PUMP PRESS lights

Answer 1

PRESS illuminated amber of fuel pump pressure is low with the pump selected on

Illumination inhibited when the center tank fuel pump switch is off

Question 2

VALVE light in the CROSSFEED switch?

Answer 2

CROSSFEED valve is not in the selected position

Question 3

Fuel balance is off if: (5)

Answer 3

Fuel is balanced

Jettison system is active

FUEL DISAGREE message

FUEL QTY LOW message

Aircraft on the ground with either engine running

Question 4

FAULT light in BALANCE switch

Answer 4

A system fault has occurred or fuel system balance is inoperative

Question 5

When will the expanded FUEL QTY display appear?

Answer 5

CROSSFEED Valve open
One or more tank qty indicators inop
FUEL IN CENTER msg
FUEL QTY LOW msg
FUEL LOW CENTER message
FUEL FLOW ENG L/R msg
FUEL IMBALANCE
Aircraft on ground both engines off
Balance system active
Balance system on but fuel already balanced
INSUFFICIENT FUEL msg

Question 6

How do we know if a fuel pump has load shed?

Answer 6

Amber PRESS light

LOAD SHED on synoptic next to pump symbol

Question 7

When the fuel balances, what valve is used?

Answer 7

The defuel/jettison valve

Question 8

Fuel balancing is inhibited for the following reasons: (7)

Answer 8

Refueling, defueling or a ground transfer
Prior to engine start w/APU off
Balance system has failed
A center tank pump on
On ground and an engine is running
Inflight and fuel jettison system is active
FUEL DISAGREE or FUEL QUANTITY LOW

Question 9

White fuel balance pointer displayed next to low quantity if:

Answer 9

FUEL IMBALANCE not displayed and main tank fuel differed more than 200 lbs and either the CROSSFEED is open or the balance system is ON

Question 10

Amber Solid fuel imbalance pointer replaces white pointer if:

Why would it flash amber?

Answer 10

FUEL IMBALANCE displayed

Pointer will flash if fuel balancing or crossfeed going in the wrong direction

Question 11

Instructions for pushing the FUEL BALANCE switch?

Answer 11

Push and hold for one second

May take up to thirty seconds to activate

Transfer stops automatically and balance system will turn itself off after fuel balanced

Question 12

When will FUEL BALANCED flash on the expanded fuel quantity display?

Answer 12

Fuel is back in balance within 200 lbs between the main tanks and the crossfeed valve is open or the balance system is on

Flashes for 5 seconds

Question 13

When do scavenge pumps begin to transfer fuel to main tanks?

Answer 13

Either main tank is less than 35,000 lbs and center tank pumps are off

The system is inhibited if engine on auction fees

Question 14

What is the fuel-to-remain automatically set to?

Answer 14

Fuel value that provides maximum landing weight