Fuel system

Question 1

Fuel tank indicators turn amber and red when?

Answer 1

Wings are Amber when below 1320LBS
Red when below 660LBS

Total fuel turns amber when below: 2640 and red below 1320

Question 2

What is minimum and emergency fuel?

Answer 2

Landing with less than 45 minutes of fuel (2250lbs)

30 minutes of fuel is 1500lbs

Question 3

How do you know if you’re being refueled?
What bus powers pressure refueling?
Can you fuel with engines running?
What condition must be met if fueling with pax on board?

Answer 3

Advisory - Door fueling open
hot bus 2
yes with crew on board only
fuel with pax require maintaining contact with fuel personnel.

Question 4

How many fuel tanks are there?

Answer 4

Two main wing tanks are divided into 3 tanks
Surge- vent
Main - 3 scavange pumps each
Collector - main ejectors and elec pumps

Question 5

Total fuel capacity

Min fuel temp

Answer 5

20,935LBS

Min temp -37C - left tank sensor only

Question 6

Manual way to control engine SOVs

Answer 6

Engine Fire Handle

Question 7

Purpose of AC fuel pumps

Answer 7

Engine start
Backup fuel pump for Main ejectors
Crossfeed
can supply fuel to both engines during crossfeed.

Question 8

Purpose of DC fuel pump

Answer 8

APU or Engine 2 start with no AC power.

Question 9

DC fuel pump - Auto and ON

Answer 9

Auto

Powered when APU or engine 2 start and AC fuel pump 2 is NA

Question 10

AC fuel pump 2 Auto

Answer 10

Turns on when Ejector 2 fails
APU or ENG 2 start
1 LOW selected
APU running without engine 2 running

Question 11

What fuel pump is on during single engine taxi

Answer 11

DC pump 2 if APU is running and engine 2 is off

Question 12

When is AC fuel pump 1 on?

Answer 12

ON
Auto -
on when Engine 1 starting
Main ejector fails 
2 LOW selected

Question 13

Max fuel imbalance for takeoff and landing

What does LOW 1 automatically do?

Answer 13

794LBS

800LBS or more triggers EICAS caution which requires QRH to check for fuel leak

Selecting LOW 1 opens Crossfeed valve and turns on AC pump 2 to supply fuel to both engines from right wing tank.

Selector must be off for takeoff and landings

Question 14

Backup to measure fuel if indicators fail on ground (MLI)

Answer 14

MX uses magnetic level indicators MLI below each wing. preflight item (Flush)

Question 15

during a normal single engine taxi with apu on what fuel pumps are running?

Answer 15

Engine pump 1 is running.

AC pump 2 is running for the APU