Fuel System

Question 1

From which tank does fuel burn first?

Answer 1

CENTER

Question 2

When does the FUEL CONFIG light come on?

Answer 2

Center Tank has > 1,200 lbs. with Center Fuel Pumps OFF

Imbalance exists of 2,000 lbs. + 500

Low Fuel of 2,200 in either wing tank

Question 3

What happens when you turn the FUEL JETTISON switch to ON?

Answer 3

-Jettison transfer valves open

-Jettison pumps operate (if installed)

-Sheds side window heat

-Equip Cooling switches to overboard

Question 4

What happens when the FUEL JETTISON NOZZLE switches are selected ON?

Answer 4

-The nozzle valves open

Question 5

What does the FMC do about fuel calculations during Fuel Jettison?

Answer 5

The FMC discontinues fuel value calculations and the totalizer value is used during fuel jettison operation.
After fuel jettison is complete, the calculated value will reset using the same value as the totalizer value.

Question 6

Will you get a FUEL DISAGREE light during Jettison?

Answer 6

No, the fuel disagree message is not displayed during fuel jettison operation.

Question 7

During the Fuel Jettison process the aircraft will put the Equipment Cooling System in OUTFLOW mode (which normally happens in OVER RIDE mode).

If you get the NO COOLING light when you start the jettison, what does this mean?

Answer 7

It means that you actually have a No Cooling situation and should not be ignored