Fuel system

Question 1

If a GPU cart is not available for starting the APU what fuel pump is used?

Answer 1

DC pump

Question 2

When Ground power is powering the aircraft and you start the APU which pump is providing fuel for APU start?

Answer 2

AC Pump

Question 3

How many fuel tanks does the Aircraft have?

Answer 3

2 Integral tanks

Question 4

What is the purpose of the collector tank?

Answer 4

To keep the pumps submerged in fuel. you dont want them cavitating and not delivering proper fuel.

Question 5

Explain how each fuel tank is set up?

Answer 5

collector tank on the inboards, and a surge tank on the outboards.

Question 6

Where would fuel indications be displayed?

Answer 6

on the EICAS and Fuel synoptic page on MFD

Question 7

With the engines running, which pumps are supplying fuel to the engine?

Answer 7

Primary Ejector pump

Question 8

How is the Primary Ejector pump powered?

Answer 8

By motive flow from engine driven pump

Question 9

What is the purpose of the AC fuel pumps?

Answer 9

Backup if the primary ejector pump or engine driven pump fails.engine starting and crossfeed - APU fuel when no engines running

Question 10

If fuel is low on one tank can it be transfered to the other?

Answer 10

no.

Question 11

Where is DC pump located?

Answer 11

Right Tank

Question 12

why do we have a DC pump?

Answer 12

provides pressurized fuel for APU start

Question 13

What is the purpose of scavange pumps

Answer 13

to keep fuel in the collector tank.

Question 14

what fuel pump Logic for fuel pumps:

Answer 14

Primary ejector pump, AC fuel pump and DC pump.

Question 15

how would you correct a fuel imbalance?

Answer 15

turn the crossfeed switch to the Low side for the respective low tank.

Question 16

how does crossfeed work?

Answer 16

It turns on opposite tank pump and opens the crossfeed valve

Question 17

Will setting the AC pump (1)(2) to anything other than auto override the fuel crossfeed commands?

Answer 17

yes

Question 18

With either engine running, which pump is supplying APU with pressurized fuel?

Answer 18

Primary Ejector pumps.

Question 19

How can aircraft be fueled?

Answer 19

Overwing or pressure fuel

Question 20

what is the company Limit for max fuel imbalance?

Answer 20

790

Question 21

when would the EICAS Display FUEL IMBALANCE?

Answer 21

800 LBS

Question 22

When would FUEL IMBALANCE Message go away?

Answer 22

when fuel imbalance less than 100 lbs

Question 23

Where is Fueling Door located?

Answer 23

under right wing

Question 24

When would the AC pump come on Automatically if in the AUTO setting?

Answer 24

Crossfeed operations, engine starting or APU starting with AC source or primary Ejector failure

Question 25

What are alternate means of checking fuel on the ground?

Answer 25

Magnetic fuel indicators

Question 26

the Fuel crossfeed must be Off for takeoff and landing? T/F

Answer 26

True

Question 27

Can you refuel the aircraft if power is OFF?

Answer 27

yes, Fuel panel is on Hot Battery Bus 2

Question 28

Where is fuel Temperature taken from?

Answer 28

Left tank

Question 29

What fuel pumps are in each wing?

Answer 29

1 primary ejector pumps, 1 AC fuel pump, 1 DC fuel pump (right wing) and 3 scavange pumps each wing

Question 30

What is a primary ejector pump?

Answer 30

Venturi type pump which uses the motive flow of engine driven pump