15.1.12 Perform Fuel System Operations and Procedures

Question 1

How many AC fuel pumps are in each tank?

Answer 1

2 per tank for a total of 6

Question 2

Which fuel tank has the most powerful pumps?

Answer 2

The center tank pumps override the left and right main pumps

Question 3

An aft “FUEL X-FEED” VALVE light EICAS indicates what?

Answer 3

The cross-feed valve position disagrees with commanded position

Question 4

The right main tank aft fuel pump PRESS light and EICAS advisory message AFT FUEL PUMP R appears means what?

Answer 4

The right main tank aft fuel pump output pressure is low

Question 5

Prior to engine start with full fuel and all tank pump switches on, are all pumps operating?

Answer 5

No. In this condition, the center pumps are inhibited

Question 6

Reference the above question, when is the inhibit removed for the center tank pumps?

Answer 6

As an engine is started and increases beyond 50% N2, the associated center pump activates

Question 7

When does the FUEL CONFIG light illuminate?

Answer 7

• > 1200lbs in Center tank with center pumps off
• > 2000lbs +/- 500lbs imbalance
• <2200lbs in any main tank (Low Level EICAS Msg)
• Fueling Door Open

Question 8

With all tanks full during take-off, the center wing tank feeds which engines?

Answer 8

Both engines

Question 9

Before engine start, what is the difference between CALCULATED fuel quantity and TOTALIZER fuel quantity?

Answer 9

There is no difference. Before start, the CALCULATED quantity is equal to TOTALIZER quantity

Question 10

Where is the FUEL USED information displayed?

Answer 10

PROGS page 2