Fuel

Question 1

The Fuel Low Level Caution turns what color and at what lbs remaining in respective tank?

Answer 1

Gauge indications turn yellow and turns yellow at 1320 lbs remaining

Question 2

The Fuel Low Level Warning turns what color and at what lbs remaining in respective tank?

Answer 2

Gauge indications turns red and turns red at 660 lbs remaining

Question 3

Is fuel temp taken from both tanks?

Answer 3

No, only from tank 1. Sensor is near fuel x-feed valve in Main LT LG Bay

Question 4

What is the primary fuel source to the engine?

Answer 4

EDP provides motive flow to the primary ejector pumps then back to EDP to complete circuit

Question 5

How do the engine driven pumps help power the fuel system?

Answer 5

provides motive flow to both the 3 scavenge pumps (to keep collector full) and primary ejector pump (constant flow to ENG)

Question 6

Where are the ejector pumps located and what method is used to move the fuel?

Answer 6

The primary ejector pump is located in the collector box and uses motive flow provided from the EDP

Question 7

What is the primary job of the scavenge pumps?

Answer 7

Keep the collector box full of fuel to keep the pumps submerged

Question 8

When is the ACMP on?

Answer 8

1. Primary ejector pump fails
2. Used for engine start
3. X-Feed operations
4. AC Pump 2 provides fuel to APU when EDP2 is not running

Question 9

Where is the DCFMP located and what is its purpose?

Answer 9

Located in the right collector box and is used for APU start when AC power or ACMP2 is not available

Question 10

What is the fuel imbalance EICAS Indication and when does the message go away?

Answer 10

FUEL IMBAL (yellow) and goes away when fuel quantity is within 100 lbs between both tanks

Question 11

Max fuel imbalance is what?

Answer 11

794 lbs (EICAS message appears around 800 lbs)

Question 12

Tank 1 fuel is low, what is the process?

Answer 12

LOW 1 is selected on Fuel Panel, which commands ACMP2 ON and opens X-Feed Valve to provide fuel to both engines

Question 13

What is the surge/vent tank?

Answer 13

1. Collects fuel during wing-down maneuvers and returns it to the main tanks once the wings are level
2. Equalizes tank pressure with atmosphere in flight and during refueling

Question 14

What is the purpose of the collector box?

Answer 14

1. Keeps fuel pumps submerged
2. Ensures constant fuel flow to the respective engine

Question 15

Can fuel be transferred from tank-to-tank or be dumped overhead?

Answer 15

Official answer is no, but yes fuel transfer is possible (a mx on ground function only); no fuel scuttling;

Question 16

What is the only way to close the fuel SOV?

Answer 16

Pull the associated engine fire extinguisher handle

Question 17

Where is refueling done on the aircraft and what powers it?

Answer 17

1. Single point or over wing with refueling panel on right wing
2. Powered by Hot Battery Bus 2

Question 18

Where are the surge tanks located?

Answer 18

Outboard section of the wing tanks

Question 19

How many water fuel drains?

Answer 19

4 drains and is usually done by MX

Question 20

How many Magnetic Level Indicators are there?

Answer 20

3 per wing (6 total)

Question 21

What happens to fuel flow if the scavenge pumps fails?

Answer 21

Fuel will begin equalizing with the integral tank until they are the same level (may get erroneous FUEL LO indications)

Question 22

Where is the fuel level sensor located?

Answer 22

Middle of both inboard walls of the collector boxes

Question 23

Where is the x-feed valve located?

Answer 23

Main LT LG Bay, near AFT aileron torque tubes

Question 24

How many baffle oval check valves are in each wing tank?

Answer 24

4

Question 25

How many flap valves are in each wing tank?

Answer 25

18

Question 26

Are the x-feed valves and shutoff valves DC or AC powered?

Answer 26

DC powered

Question 27

Where is the APU fuel SOV located?

Answer 27

It is located next to fuel X-feed and 2 pressure switches in Main LT LG Bay

Question 28

What is the job of the FCU or Fuel Conditioning Unit? and where is it located?

Answer 28

It gathers info on fuel temp and fuel level and processes that then sends it to the MAUs to be displayed on MFDs. It is located in the Middle Avionics Bay