FUEL

Question 1

How is fueling and defueling accomplished?

Answer 1

At the single-point pressure fueling station

Question 2

What is the purpose of the surge tanks?

Answer 2

Designed to collect overflow.

Question 3

What is the purpose of the Fuel Crossfeed valve?

Answer 3

Any tank to any engine

Question 4

With all pumps operating, which tank fuel is burned first?

Answer 4

Center fuel is burnt first (these pumps have a higher output pressure) Then respective main tank fuel is burnt

Question 5

What ensures center tank fuel is used before other tanks?

Answer 5

The Center Tank Pumps have a higher output pressure.

Question 6

Can the APU suction feed fuel? From which tank?

Answer 6

Yes, from Main Tank No. 1 (and from Main tank 2 via Tank 1 with no engines running with x-feed open)

Question 7

*What causes the Center Tank Fuel Scavenge Jet Pump to activate?

Answer 7

A float valve when fuel in Main Tank 1 drops below 4500lbs.

Question 8

What is the light logic of the Crossfeed VALVE OPEN light?

Answer 8

VALVE OPEN (bright blue) = in transit or disagree 
VALVE OPEN (dim blue) = valve is open with selector open 
Light extinguished when the selector and switch are both closed.

Question 9

What causes an IMBAL (amber) alert, and where do you see it?

Answer 9

More than 1000lbs imbalance between center tanks 1 & 2 for more than 60 sec

Question 10

What causes a CONFIG (amber) alert, and where do you see it?

Answer 10

When either Eng is running, Center pumps are off and more than 1600lbs in Center Tank.

Question 11

What causes a fuel LOW (amber) alert, and where is it indicated?

Answer 11

Less than 2,000lbs in respective (main) tanks for greater than 30 seconds.

Question 12

Where is the Nitrogen Generation System indicator?

Answer 12

Main Wheel well adjacent to the APU Fire Control Panel.

Question 13

With the loss of AC powered fuel pumps, how is fuel provided to the engine?

Answer 13

A suction feed line to main tanks that bypasses the pumps. No center tank fuel with loss of AC power

Question 14

What is the logic of the center tank fuel pumps?

Answer 14

10 sec after continuous LOW PRESSURE indicated , FUEL annunciator/ MASTER CAUTION will illuminate.
15 sec after continuous LOW PRESSURE indicated, Pump Shuts OFF.
When the switch is moved to off the shutoff logic resets.

Question 15

If a fuel quantity indicator fails, how is actual fuel quantity determined?

Answer 15

Fuel measuring sticks

Question 16

What does the Engine Start Lever control? What occurs in each position?

Answer 16

ENG VALVE & SPAR VALVE
CUTOFF - ENG VALVE & SPAR VALVE closed
MOVE TO IDLE - ENG VALVE & SPAR VALVE in transit
IDLE - LIGHT EXTINGUISHED - ENG VALVE & SPAR VALVE open

Question 17

What do the ENG VALVE CLOSED and SPAR VALVE CLOSED lights indicate? What is their light logic?

Answer 17

They are closed. Light logic in prev question.