Fuel Flashcards
We have a DC fuel pump to provide pressurized fuel for regular APU operation, and engine start when AC power or the AC fuel pump is not available (T/F).
True
How is the aircraft refueled?
2 overwing manual refueling ports and one pressurized refueling point on the right wing
The engine fuel shutoff valves can be closed via selector knobs on the FUEL panel (T/F).
False
Engine motive flow powers:
Ejector pumps
The fuel crossfeed valve automatically opens when a fuel imbalance of 800 pounds occurs
False
Will setting the AC PUMP 1 (2) selector knobs to any position other than AUTO override the fuel crossfeed commands?
Yes
The collector tank keeps the fuel pumps submerged, ensuring constant fuel flow to the respective engine (T/F).
True
How many fuel tanks does the aircraft have?
2 integral fuel tanks
How is each integral fuel tank set up?
Collector tank in the inboard section and a surge tank located at the outboard section
Where would the fuel system indications and parameters be displayed?
MFD fuel synoptic page and EICAS
What would be the EICAS indication of a max fuel imbalance?
EICAS FUEL IMBALANCE caution is displayed when the imbalance reaches 800 pounds until the imbalance reaches 100 pounds
What fuel level causes the FUEL IMBALANCE message to appear and when does it go away?
800; 100
Can the aircraft be over wing refueled?
Yes, by two gravity refueling ports, one on each wing
Where is the refueling door located?
Right wing
Can you refuel the aircraft while the power is off (no APU/GPU)?
Yes
What powers the refuel panel when APU and GPU are off?
HOT BATT BUS 2
Where is the fuel tank temperature taken?
Left tank
What fuel pumps are in each wing?
1 primary ejector pump, 1 AC electric pump, 1 DC Electric Pump (right tank), 3 scavenge pumps
What is the primary ejector pump?
Venturi pump with no moving parts and no electrical power
How is the primary ejector pump powered?
Motive flow from the respective engine driven fuel pump
With all engines running, through which pumps are the APU and engines fed?
Primary ejector pumps
What is the purpose of the AC Fuel Pump?
Back up pump supplying fuel to the engine in the event of an ejector pump failure or during engine start
Supply fuel to the APU when the engine isn’t running
Crossfeed operations
When will the AC pump turn on automatically if the AC pump selector knob is set to AUTO?
Crossfeed operations
Ejector pump failure
Engine start
APU operation if the #2 ejector pump is not operating
Which fuel tank is the APU’s normal source?
Right tank
How many ways are there to close the fuel SOV?
One, pulling the associated fire handle
What closes the engine shutoff valve?
Pulling the associated fire handle
Regarding fuel, what happens when the respective fire handle is pulled?
Fuel shutoff valve closes
Where is the DC fuel pump located?
Right wing tank
When can the DC fuel pump be used?
In flight or on the ground
Why do we have a DC pump?
To provide pressurized fuel for normal APU operation and engine start when AC power or the AC fuel pump is not available
What is the purpose of scavenge pumps?
Maintains fuel level in the collector tank
Which pump takes priority once an engine is started, if all pumps are available?
Associated primary ejector pump
What is the fuel pump system logic for fuel feed to the engine during normal operations?
Primary ejector pump, AC pump, DC pump
What is the purpose of the collector tank?
Keeps the fuel pumps submerged and ensures constant fuel flow to the primary ejector pump, AC fuel pump, and DC fuel pump
Can fuel be transferred tank to tank or dumped overboard?
No
How would you correct a fuel imbalance?
Position crossfeed selector knob to the low side with LOW (1)(2) as required
How does crossfeed work?
Opens the crossfeed valve and automatically turns on the opposite AC fuel pump
Will setting the AC PUMP (1) (2) selector knob to any position other than auto override the fuel crossfeed commands?
Yes
What are the alternate means of measuring fuel on the ground?
3 magnetic level indicators under each wing
What is the maximum fuel imbalance between tanks?
790 lbs
When must the XFEED selector be set to OFF?
Takeoff and landing
What is the minimum fuel temperature?
-37°C
How is fuel supplied in the event of dual engine failure with the RAT deployed?
Fuel supplied from the right wing using the AC ESS BUS
What bus supplies electrical power to the DC motor pump?
DC ESS 2
