Fuel

Question 1

Tanks

Answer 1

• 2 Fuel tanks (1 each wing)
• Collector box (inboard section of each wing)
• Collector box keeps fuel pumps submerged
• Vent system ensures pressure between tank and ambient remains within structural limits

Question 2

Fuel Quantity

Answer 2

• 20,935 LBS total

Question 3

Low level fuel warning occurs when

Answer 3

• Each tank has 660 LBS in each tank

Question 4

Where is fuel temperature taken

Answer 4

• Fuel temperature is taken from left wing (min -40 C)

Question 5

Fuel pumps

Answer 5

• 2 Engine-driven pumps
• 2 primary pumps (main) ejector pumps
• 6 Scavenger ejetor pumps
• 2 AC electrical pumps
• 1 DC electrical pump

Question 6

Engine-Driven pumps

Answer 6

• Primary fuel source to the engine
• Provides motive flow to the primary ejector pump
• Provides the pressure for motive flow to scavenger pumps

Question 7

Ejector pumps

Answer 7

• Located in collector tank
• Venturi-type/motive flow
• Maintains head pressure in the fuel line going to the respective engine

Question 8

Scavenge pumps

Answer 8

• Maintain adequate fuel level in collector tank

Question 9

AC Fuel pumps

Answer 9

• Back-up for the ejector pumps
• Used for engine starts
• Used during cross feed operations
• AC pump 2 provides fuel to APU when engine-driven pump (EDP) 2 is not running

Question 10

DC Fuel pump

Answer 10

• Installed only in the right wing

- Provides pressurization fuel for normal APU start when AC power or the AC fuel pump 2 is not available

Question 11

Fuel cross feed

Answer 11

• Allows fuel to both engines from one tank
• Used to connect fuel imbalance
• Max fuel imbalance is 800 lbs

Question 12

Fuel Cross feed happens when

Answer 12

• 800 lbs imbalance and turns off within 100 lbs

Question 13

What happens when fuel cross feed opens

Answer 13

• Low 1 right wing tank electric pump turns ON and x-FEED valve opens
• Low 2 left wing tank electric pump turns ON and x-feed valve opens

Question 14

Engine fuel shutoff valve

Answer 14

• Only the respective fire handles in the cockpit will close the respective shutoff valve

Question 15

Refueling and Defueling

Answer 15

• Single point or over wing

- Powered by BATT2 or DC Buses

Question 16

How else can fuel level be measured?

Answer 16

• By three magnetic level indicators MX function

Question 17

When does fuel quality does the gauge show quality in amber?

Answer 17

• When fuel quality is below 1320 pounds each tank

- Both tanks 2640 pounds

Question 18

When does fuel indicate red quality?

Answer 18

• When fuel is below 660 pounds each tank

- Both tanks below 1360 pounds