Fuel

Question 1

How is fueling and defueling accomplished?

Answer 1

At the single-point pressure fueling station in the right wing.

Question 2

What is the purpose of the surge tanks?

Answer 2

Outboard on each wing to accommodate overfill and thermal expansion

Question 3

What is the purpose of the Fuel Cross feed valve?

Answer 3

Either engine can be fed from either main tank or Left and rights isolated

Question 4

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

Answer 4

Center fuel tank is used first

Question 5

What ensures this 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 1

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

Bright blue: valve is in transit or disagrees with switch position

Dim: valve is open with selector in open.

Extinguished: selector and valve are both closed

Question 9

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

Answer 9

Main Tanks differ more than 1000lbs for 60 seconds.

UPPER DU. Amber on the lower quantity side

Question 10

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

Answer 10

An Engine is running, center pumps are off and there is greater than 1600lbs of fuel in the center tank

UPPER DU

Question 11

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

Answer 11

Respective Main Tank fuel quantity less than 2000lbs for more than 30 seconds.

UPPER DU

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 the fuel provided to the engine?

Answer 13

A suction feed line that bypasses the fuel pumps

Question 14

What is the logic of the center tank fuel pumps?

Answer 14

10 seconds after continuous LOW PRESSURE indicated: FUEL annunciator/MASTER CAUTION illuminates

15 seconds after continuous LOW PRESSURE indicated, Pump Shuts OFF.

When switch is moved to off the shutoff logic resets.

Question 15

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

Answer 15

Fuel measuring sticks. 6 Each Main Tank, 4 in the center tank.

Question 16

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

Answer 16

ENG VALVE & SPAR VALVE

Question 17

What do the ENG VALVE CLOSED and SPAR VALVE CLOSED lights indicate.

Answer 17

CUTOFF: DIM BLUE - valves closed

IDLE: BRIGHT BLUE - valves in transit or valve position disagrees with Engine Start Lever or Engine Fire switch position

IDLE: LIGHTS EXTINGUISHED - valves open