Fuel Flashcards
How many fuel tanks are there?
There are 2 fuel tanks, one in each wing.
What is the function of the collector box in each wing?
The collector box keeps fuel pumps submerged to ensure constant fuel flow to the respective engine.
What does the vent system do?
The vent system ensures pressure between the tank and ambient remains within structural limits.
What is the total fuel quantity?
The total fuel quantity is 20,935 lb.
At what weight does the Fuel Low Level warning occur?
The Fuel Low Level warning occurs at 660 lb in the respective tank.
What is the minimum fuel temperature taken from the left wing?
The minimum fuel temperature is -37°C.
How many engine-driven fuel pumps are there?
There are 2 engine-driven pumps.
What types of ejector pumps are present?
There are 2 primary (main) ejector pumps and 6 scavenge ejector pumps.
What type of electric pumps are included?
There are 2 AC electric pumps and 1 DC electric pump.
What is the primary function of engine-driven pumps?
Engine-driven pumps are the primary fuel source to the engine.
What do ejector pumps maintain?
Ejector pumps maintain head pressure in the fuel line going to the respective engine.
What is the function of scavenge pumps?
Scavenge pumps maintain adequate fuel level in the collector tank.
What is the purpose of AC fuel pumps?
AC fuel pumps are back-up for the ejector pumps, used for engine starts, and during crossfeed operations.
What does AC Pump 2 provide fuel for?
AC Pump 2 provides fuel to the APU when engine-driven pump 2 is not running.
Where is the DC fuel pump installed?
The DC fuel pump is installed only in the right wing.
What does the DC fuel pump provide?
The DC fuel pump provides pressurized fuel for normal APU start when AC power or AC fuel pump 2 is not available.
What is fuel crossfeed?
Allows fuel to both engines from one tank and is used to correct fuel imbalance.
What is the maximum fuel imbalance?
794 lb. (CAS message appears at about 800 lb.)
At How many pounds does the CAS message for imbalanced fuel go away?
When fuel is within 100 lb. balanced.
What happens when LOW 1 is indicated?
The right wing tank electric pump turns ON and the X-FEED valve opens.
What happens when LOW 2 is indicated?
The left wing tank electric pump turns ON and the X-FEED valve opens.
How are engine fuel shutoff valves operated?
Only the respective fire handles in the cockpit will close the respective shutoff valves.
What are the refueling options?
Single-point or over wing.
Which battery powers the refueling and defueling system?
Powered by BATT 2 or DC buses.
How many fuel tanks does the airplane have?
2 integral tanks.
Where is fuel tank temperature taken?
Left tank.
What types of fuel pumps are in each wing?
Primary ejector pump, ACMP, DCMP (right tank), and 3 scavenge ejector pumps.
How does the Primary ejector pump work?
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 ACMP?
Back-up pump in case of primary ejector pump failure, engine start, and crossfeed operations.
What is the purpose of the DCMP?
Used for APU or engine start if AC power or the ACMP is not available.
What is the purpose of the scavenge pumps?
Maintains fuel level in the collector box.
What pump(s) is used once an engine is started?
Primary (main) ejector pump.
What is the 2 purposes of the collector box?
Keeps the fuel pumps submerged
Ensures constant fuel flow to the respective engine
What is the 2 uses surge/vent tank?
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
Can fuel be transferred from tank-to-tank or be dumped overboard?
No
What happens when the crossfeed switch is selected to LOW 1?
Crossfeed valve is opened
Commands the ACMP 2 to ON to provide fuel from the right tank to both engines
What is the only way to close the engine fuel SOV?
Pull the associated engine fire extinguishing handle
When will the FUEL 1(2) LO LEVEL EICAS be presented?
660 lb. of fuel remaining in the associated tank
Fuel Low Level caution (gauge indications turn yellow only) occurs with how many pounds of fuel in the tank
1320 lbs
