Fuel Flashcards
How many fuel tanks does the aircraft have?
2 integral wing tanks
Where would the fuel system indications and parameters be displayed?
On the MFD synoptic pages and the EICAS
How do you reset the fuel used?
NAV, select 3R, Press DEL, select 2L
What is the total fuel capacity?
20,935
How much usable and unusable fuel is in each tank?
Usable - 10,392.5 lbs
Unusable - 75 lbs
What is the fuel density?
6.767 lbs/US GAL
What would be the indication of a fuel imbalance?
An EICAS FUEL IMBALANCE caution is displayed when the imbalance exceeds 800 lbs and remains until the imbalance is less then 100 lbs
Where is the refueling door located?
Right wing
Can the aircraft be over-wing fueled?
Yes, by two manual refueling ports, one on each wing
Can you refuel the airplane without APU/EXT power?
Yes
Does the aircraft have collector tanks?
Yes
Will an inop ejector pump give an EICAS indication?
Yes
Where is the fuel tank temp taken from?
Left tank
What types of furl pumps are in each wing?
- Primary ejector pump
- ACMP
- DCMP (right only)
- 3 scavenge ejector pumps
What is the primary ejector pump?
- Venturi pump with no moving parts and no electrical power used by the respective engine
- Powered by motive flow
What is the purpose of the AC fuel pumps?
- Backup pump, supplying fuel to the engine in the event of ejector pump failure or during engine start
- Supply fuel to the APU when the engine is not running
- X-feed ops
What happens when the AC PUMP 1 (2) and DC PUMP selector knob is in AUTO?
Automatically operates the associated AC or DC fuel pump according to system logic
Does the aircraft have a DC pump?
Yes on the right side
What is the only thing that closes an engine shutoff valve?
Fire handle
What is the purpose of the DC fuel pump
Ir provides pressurized fuel for normal operation APU operation and engine start, when AC power or the AC pump is not available
What is the purpose of scavenge pumps?
Maintains fuel level in the collector box
What does the OFF position of the fuel crossed selector knob do?
Closes the crossed valve
What does the OFF position of the DC fuel pump knob do?
Deactivates the DC fuel pump
What does the OFF position of the AC FUEL selector knob do? ON position?
OFF: Deactivates the associated AC pump
ON: Activates the associated AC pump
What pump is used once an engine is started?
Associated primary ejector pump
What is the purpose of the collector box?
- Keeps fuel pumps submerged
- Ensures constant fuel flow to the respective engine
What is the surge/vent tank
- Collects fuel during wing-down maneuvers and returns it to the main tank once the wings are level
- Equalizes tank pressure with atmosphere in flight and during refueling
What protects the fuel tank from over-pressurization
Pressure relief valve
Can fuel be transferred from tank to tank or be dumped overboard?
No
When does the x-feed valve open automatically?
During refueling operations
How is the fuel cross-fed during flight
Select LOW 1 or LOW 2 with AC PUMPS in AUTO
If you start to crossed before you get the fuel imbalance EICAS at 800 lbs, will you get an indication to stop the crossfeed?
No
At what fuel level do you get the EICAS “FUEL IMBALANCE” and what is the max fuel imbalance limitation?
800 lbs, 794 lbs
How many magnetic level indicators are on each wing?
3
How would you correct a fuel imbalance?
Position the crossed selector knob to the tank to the low side as required
Will setting AC PUMP 1 or 2 selector knob to any position other than AUTO override the x-feed command?
Yes
What happens when the crossed switch is selected to LOW 1
- Crossend valve is opened
- Automatically activates the right AC fuel pump (AC FUEL PUMP 2), supplying from the right tank to both engines
Do AC pumps continuously run during normal operations
No, but it does run during an engine start
What does the LOW 1 (2) position on the fuel crossed selector knob do?
Opens the crossed valve and turns on the opposite AC fuel pump
What is the power source for AC PUMP 1?
AC PUMP 2?
- AC BUS 1
- AC ESS BUS
APU normally gets fuel from where?
Right wing tank
What is an alternate method for determining fuel quantity if the fueling panel did not work?
- Magnetic fuel level indicators or reading the fuel on the MFD or EICAS
- Maintenance function only
What is the only way to close the engine fuel SOV
Pull the associated fire handle
How would you check the fuel quantity if the electric fuel quantity indicator fails?
With the magnetic indicators
When will the FUEL 1 (2) LO LEVEL EICAS be presented?
660 lbs of fuel remaining in the associated tank
The DC Fuel pump is located where and can be used for what?
Is located on the right wing tank and can be used in flight and on the ground
Why do you have a DC pump?
RAT/batteries or DC GPU
Why during dual engine failure do you put the fuel crossed to LOW 1?
to allow the DC pump to get fuel to the #1 engine when on RAT/batteries
How can you determine if you have a fuel leak?
- By the QRH, but here are some signs:
- Visual observations of fuel spray from the strut/engine, excessive engine fuel flow, total fuel quantity reducing at an abnormal rate, fuel imbalance
With the engines running, through which pumps are the engines and APU fed?
Primary ejector pumps
Can Republic Airlines operate into reserve fuel if needed? If yes, what will the pilot need to do?
Yes, declare Min Fuel with ATC and do not accept delays
How does Republic Airlines calculate EXTRA fuel?
Minimum of 25 mins of extra fuel calculated using a holding burn rate at 10,000 ft
When should a fuel emergency be declared? When should Min Fuel be declared?
Emergency: When projected fuel consumption will result in landing with less than 30 minutes of fuel
Min Fuel - When projected fuel consumption will result in landing with less than 45 mins of fuel
Should you continue knowing you will be landing in a fuel emergency?
No
What are the Amber and Red fuel numbers for the E170?
Amber - 1320/side
Red - 660/side
