Study Guide: Fuel

Question 1

757: To reduce electrical loads, the center tank pumps are normally inhibited in flight or on the ground when:

Answer 1

The associated N3 is less than 50% RPM

Question 2

757/767: According to the graphic, if the APU was not running, would these indications be normal?

Answer 2

No, the L FWD fuel pump PRESS light should be illuminated

Question 3

757/767: Fuel is normally supplied to the APU from the left main fuel tank. While the APU is running, fuel is pumped by the:

Answer 3

Left forward fuel pump

Question 4

757/767: Fuel is contained in a center tank and left and right main tanks. Additionally,
located in each wing tip are surge tanks. Fuel from each surge tank is drained into:

Answer 4

The associated main tank

Question 5

757/767: A fuel crossfeed VALVE light illuminates and the EICAS advisory message FWD FUEL X-FEED or AFT FUEL X-FEED displays if:

Answer 5

The fuel crossfeed valve is not in the commanded position

Question 6

757/767: When center tank fuel is depleted, this will be indicated by:

Answer 6

EICAS advisory messages CTR L FUEL PUMP and CTR R FUEL PUMP

Question 7

757/767: According to the graphic, all six fuel pumps are operating, therefore the _________ provide fuel to the engines.

Answer 7

Center tank

Question 8

757: The fuel temperature (TEMP) indication displays the temperature of fuel in the:

Answer 8

Right main tank

Question 9

767: The fuel jettison system allows jettison from the _________.

Answer 9

Center tank

Question 10

767: Two dual pump units provide a high capacity jettison rate of approximately _____
pounds per minute.

Answer 10

2600

Question 11

763: Positioning the FUEL JETTISON selector to ON automatically ________________
in order to reduce electrical demand.

Answer 11

Inhibits L-3 and R-3 window heat and configures equipment cooling to the override mode

Question 12

767: The fuel temperature (TEMP) indication displays the temperature of fuel in the:

Answer 12

Left main tank

Question 13

767: When fuel quantity in the left and right main tanks differ by 2000 pounds (plus or minus 500 pounds) the ________ light illuminates and the corresponding EICAS
advisory message is displayed.

Answer 13

FUEL CONFIG

Question 14

757: When fuel quantity in the left and right main tanks differ by ______ pounds the FUEL CONFIG light illuminates and the corresponding EICAS advisory message is displayed.

Answer 14

1800

Question 15

757/767: According to the graphic, the fuel configuration FUEL CONFIG light is illuminated. Which statement provides a possible cause for it’s illumination?

Answer 15

The center tank contains more than 1200 pounds and the center fuel pump switches are OFF

Question 16

757/767: Crossfeed valves isolate the left fuel manifold from the right. These valves are
normally closed, providing fuel feed from tank to engine. The valve(s) are opened:

Answer 16

Any time it becomes necessary to feed an engine from an opposite fuel tank

Question 17

757/767: When fuel quantity in the left and right main tanks differ by _____________ the FUEL CONFIG light illuminates and the corresponding EICAS advisory message is
displayed.

Answer 17

1800 lbs (757) and 2000+/-500 lbs (767)

Question 18

757/767: Which statement provides a situation that would cause the FUEL CONFIG light
to illuminate?

Answer 18

The total usable fuel in the left or right main tank drops below approximately 2200 pounds

Question 19

757/767: The nitrogen generation system (NGS) converts bleed air to nitrogen-enriched air (NEA) during all phases of flight. The NEA is delivered to:

Answer 19

The center fuel tank to reduce flammability of the tank

Question 20

757: With the center tank pumps off, remaining center tank fuel is automatically scavenged by a fuel scavenge ejector pump. A valve allows fuel to be discharged into
the __________ when that tank is less than 50% full.

Answer 20

Left main tank

Question 21

767: With _______________, scavenge of remaining center tank fuel begins when the
main tanks are approximately half full.

Answer 21

Center tank pumps off

Question 22

767: To reduce electrical loads, the center tank pumps are normally inhibited in flight or on the ground when:

Answer 22

The associated N2 is less than 50% RPM