Fuel system Flashcards
If a GPU cart is not available for starting the APU what fuel pump is used?
DC pump
When Ground power is powering the aircraft and you start the APU which pump is providing fuel for APU start?
AC Pump
How many fuel tanks does the Aircraft have?
2 Integral tanks
What is the purpose of the collector tank?
To keep the pumps submerged in fuel. you dont want them cavitating and not delivering proper fuel.
Explain how each fuel tank is set up?
collector tank on the inboards, and a surge tank on the outboards.
Where would fuel indications be displayed?
on the EICAS and Fuel synoptic page on MFD
With the engines running, which pumps are supplying fuel to the engine?
Primary Ejector pump
How is the Primary Ejector pump powered?
By motive flow from engine driven pump
What is the purpose of the AC fuel pumps?
Backup if the primary ejector pump or engine driven pump fails.engine starting and crossfeed - APU fuel when no engines running
If fuel is low on one tank can it be transfered to the other?
no.
Where is DC pump located?
Right Tank
why do we have a DC pump?
provides pressurized fuel for APU start
What is the purpose of scavange pumps
to keep fuel in the collector tank.
what fuel pump Logic for fuel pumps:
Primary ejector pump, AC fuel pump and DC pump.
how would you correct a fuel imbalance?
turn the crossfeed switch to the Low side for the respective low tank.
how does crossfeed work?
It turns on opposite tank pump and opens the crossfeed valve
Will setting the AC pump (1)(2) to anything other than auto override the fuel crossfeed commands?
yes
With either engine running, which pump is supplying APU with pressurized fuel?
Primary Ejector pumps.
How can aircraft be fueled?
Overwing or pressure fuel
what is the company Limit for max fuel imbalance?
790
when would the EICAS Display FUEL IMBALANCE?
800 LBS
When would FUEL IMBALANCE Message go away?
when fuel imbalance less than 100 lbs
Where is Fueling Door located?
under right wing
When would the AC pump come on Automatically if in the AUTO setting?
Crossfeed operations, engine starting or APU starting with AC source or primary Ejector failure
What are alternate means of checking fuel on the ground?
Magnetic fuel indicators
the Fuel crossfeed must be Off for takeoff and landing? T/F
True
Can you refuel the aircraft if power is OFF?
yes, Fuel panel is on Hot Battery Bus 2
Where is fuel Temperature taken from?
Left tank
What fuel pumps are in each wing?
1 primary ejector pumps, 1 AC fuel pump, 1 DC fuel pump (right wing) and 3 scavange pumps each wing
What is a primary ejector pump?
Venturi type pump which uses the motive flow of engine driven pump
