Fuel

Question 1

Center Tank Press lights

Answer 1

• Pump ON with associated N2 or N3(RR) below 50%

- inhibited with C tank switch Off

Question 2

FUEL CONFIG light

Answer 2

• Center pumps off w/ 1200 lbs+ fuel in Center tank
• Fuel Imbalance of 1800 lbs+ between Main tanks
• Fuel below 2,2000 lbs in either Main tank

Question 3

Where is Fuel Temp measured?

Answer 3

Right main tank (757)

Left main tank (767)

Question 4

Normal Fuel Supply

Answer 4

• L Fuel Manifold (L AC FWD, L AC AFT, C Left OVRD) —> left engine
• R Fuel Manifold (R AC FWD, R AC AFT, C Right OVRD) —> right engine
• L AC FWD —> APU

Question 5

Where is totalizer fuel displayed

Answer 5

• total fuel quantity indicator

- FMC PERF INIT and PROG 2

Question 6

FUEL PUMPS and Output pressure

Answer 6

Left Tank:

• 2 x AC fuel pumps (FWD and AFT) - single pump can supply 1 engine under all conditions
• 1 x DC fuel pump - back up for APU start

Right Tank:
- 2 x AC fuel pumps (FWD and AFT) - single pump can supply 1 engine under all conditions

Center Tank
- 2 x AC Fuel Override pumps - supply greater output pressure and have priority over main tanks so that center tanks is used first

Question 7

Fuel scavenge pumps

Answer 7

• operated automatically
• transfers remaining fuel in center tank to the left tank (757) / both tanks (767)
• begins when left tank is approx 1/2 full

Question 8

DC Fuel Pump logic

Answer 8

• No AC power supplied to aircraft
• BATT switch ON
• APU start

Question 9

How many crossfeed valves

Answer 9

Single or Dual (as installed)

• only one is needed for successful crossfeed

Question 10

Suction Feed

Answer 10

• possible from main tanks only

- when fuel tank pump pressure is low

Question 11

Fuel tank quantity (757)

Answer 11

Center - 46,200 lbs
Left Main - 14,600 lbs
Right Main - 14,600 lbs

Total 75,400 lbs

Question 12

Fuel tank Quantity (767)

Answer 12

Left Main tank - 40,600 lbs
Right Main tank - 40,600 lbs
Center tank - 80,400 lbs

Total - 161,600 lbs

Question 13

Fuel Jettison ON (767)

Answer 13

• two dual jettison/OVRD pumps operate (4 jettison pumps total)
• Fuel jettison valves open
• jettison rate of approx 2600 lbs per min
• jettison via nozzles inboard of each outboard aileron

Question 14

How is center tank residual fuel transferred

Answer 14

• Center tank residual fuel is automatically transferred to both main tanks (767) or left main tank (757) by jet pumps
• Jet pumps begin to operate when the main tanks (767) or left main tank (757) are approximately half empty