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ERJ170 Fuel System
System Study Questions
18
Aviation
Professional
07/19/2014

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Cards

Term
How many fuel tanks does the airplane have?
Definition
2 integral tanks
Term
Where is fuel temperature taken?
Definition
Left tank.
Term
What types of fuel pumps are in each wing?
Definition
-Primary ejector pumps
-ACMP
-DCMP
-3 Scavange ejector pumps
Term
What is the Primary ejector pump?
Definition
-Venturi pump with no moving parts and no electrical power used by the respective engine.

-Powered by motive flow.
Term
What is the purpose of the ACMP?
Definition
-Back-up pump is case of primary ejector pump failure.

-Engine start

-Crossfeed operations
Term
What is the purpose of the DCMP?
Definition
Used for APU or engine start if AC power or the ACMP is not available.
Term
What is the purpose of the scavenge pumps?
Definition
Maintains fuel level in the collector box.
Term
What pump(s) is used once an engine is started?
Definition
Associate primary ejector pump
Term
What is the purpose of the collector box?
Definition
-Keeps the fuel pumps submerged

-Ensures constant fuel flow to the respective engine.
Term
What is the surge/vent tank?
Definition
-Collects fuel during wing-down maneuvers and returns it to the main tanks once the wings are level.

-Equalizes tank pressure with atmosphere in flight and during refueling.
Term
Can fuel be transferred from tank-to-tank or be dumped overboard?
Definition
No (the only exception is by performing a maintenance function on the ground).
Term
What happens when the crossfeed switch is selected to LOW 1?
Definition
-Crossfeed valve is opened.

-Commands the ACMP 2 to ON to provide fuel from right tank to both engines.
Term
What is the only way to close the engine fuel SOV?
Definition
Pull the associated engine fire extinguishing handle.
Term
When will FUEL 1(2) LO LEVEL EICAS be presented?
Definition
660 lbs of fuel remaining in the associated tank.
Term
What components are in each tank?
Definition
Ejector fuel pump
AC Motor Pump (ACMP)
3 Scavenge Pumps
DC Motor Pump (#2 Tank Only)
Temp (#1 Tank only)
Term
Can you refuel without applied to the plane?
Definition
Yes. Refuel panel on DC Hot Batt Bus 2
Term
When do ACMP come on?
Definition
Engine start
Motive flow fail
Cross-feed
Term
If you get a LO FUEL indication but show as much as 3970 lbs of fuel, what can that indicate?
Definition
Loss of motive flow and scavenge pumps and collector tanks are not staying full. 3970 lbs is the point the main tanks are even with the collector tanks.
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