Fuel

Question 1

Recall the function of the FUEL QTY A/B button

Answer 1

Selects the alternate channel of the fuel quantity gauging system

Question 2

Recall the function of the FUEL SYS TEST button

Answer 2

Button is a MAINTENANCE function only – no crew action required. When pushed
and held, starts a fuel system test display on the FUEL SD

Question 3

Recall the function of the START PUMP

Answer 3

A DC start pump, located in the right main tank, provides fuel pressure for starting the APU or engines when AC power is not available

Question 4

Recall the function of the FUEL USED RESET button

Answer 4

Resets fuel used digits on the fuel synoptic

Question 5

Recall approximate fuel tank capacities

Answer 5

Left Wing Tank: 9,266 lbs
Center Wing Tank: 6,077 lbs
Right Wing Tank: 9,266 lbs
TOTAL: 24,609 lbs

Question 6

Recall the number of fuel pumps available for each tank

Answer 6

• Each main tank uses two AC boost pumps arranged in parallel
• The center tank has two identical pumps arranged in series
• Normally, fuel from the left tank feeds the left engine and fuel from the right tank feeds the right engine, however, if center tank fuel is present, the higher pressure produced by the center pumps will allow the center tank to feed both engines

Question 7

Recall the Fuel Return to Tank (RTT) process

Answer 7

• Excess warmed fuel cycling through the engine fuel system is returned to the inboard, cooled corner of each main tank
• This process warms the fuel in the tank and retards wing ice formation due to cooled fuel
• Fuel return to tank flow may be inhibited by the EEC for many reasons, including:
takeoff, landing, main tank fuel low, or high fuel temperature

Question 8

Describe the use of FUEL X-FEED lever

Answer 8

A FUEL X-FEED lever, on the pedestal, permits routing of fuel from either main fuel tank to one or both operating engines. Cross-feeding is enabled when the valve is opened and the boost pumps on the receiving side are turned off

Question 9

Recall features of the Fuel Venting system

Answer 9

• The fuel vent system permits equalization of pressure between tanks during all fuel conditions and also prevents siphoning and spilling of fuel during normal flight and ground maneuvers
• Right and Left main tanks are vented to the center tank. This also permits overflow from the main tanks to drain into the center tank during fuel return to tank operation with the main tanks full
• Center tank fuel is vented to the wingtip vent boxes

Question 10

Recall how the APU is supplied fuel

Answer 10

The APU normally is supplied fuel from the right main tank, however, if the center tank contains fuel and its pumps are on, the center tank will supply the APU

Question 11

Recall APU fuel usage for ground operations

Answer 11

350 pounds/hour