Fuel system Flashcards
How many electric boost pumps does the EMB-145 have
6: three each wing
When is it required that at least one electric fuel pump must be operating
During takeoff and go around
What is the purpose of the fuel pump selector?
To select either pump A, B, or C as the operating pump
What will happen if the electric driven fuel pump pressure drop below 6.5 psi on the inlet side of the FPMU?
An EICAS message caution E1(2) FUEL LO PRESS may illuminate
The remaining pumps will automatically cycle on and off until the pilot selects another pump on the overhead panel
Which buses power the different electric fuel pumps
Fuel pump A is powered by onside essential bus, fuel pump B is powered by offside, essential bus, and fuel pump C is powered by onside main DC buses
What is the purpose of the collector box near the wing root?
To keep the electric pump inlets submerged at all times
What powers the transfer ejector pumps
Motive flow fuel pressure
What is the purpose of the transfer ejector pump?
To keep the collector box filled
What are the pressure limits for pressure refueling?
35 to 50 psi
Can pressurize refueling be performed solely on battery power
Yes, although it is normal to do it with the aircraft energized
How many measuring sticks does the EMB – 145LR have on each side
Three
What is the purpose of the crossfeed selector?
To transfer fuel from one wing to the opposite side engine
To which side should the crossfeed switch be set for fuel crossfeed operation?
 the crossfeed switch should be selected to the lower side
Does Crossfeed operation allow fuel transfer between wing tanks?
No
How must the X–FEED selector be set during takeoff and go around
Off
What message would alert the crew to the fuel crossfeed valve being fully open?
Fuel cross-feed open advisory message on the EICAS
In which tank is the fuel low temperature sensor located?
Left
The FUEL IMBALANCE EICAS message will occur when one tank differs by how much from the other tank
800lbs. The message will disappear when the difference decreases below 100 pounds.
What is the minimum temperature for fuel leaving the FCOC if the fuel does not contain an icy inhibitor
It must be above 4°C
How does the crew know whether this condition (minimum temperature for fuel leaving the FOC if the fuel does not contain an icing inhibitor) is met or not
EICAS message E1(2) FUEL LOW TEMP is shown if it is not met
What are the components of the wing fuel tank vent system?
Float vent valves, vent lines, a surge box, and a NACA air intake
What is the purpose of the wing tank vent system?
To prevent damage to the wings from excessive positive or negative pressures in the tanks
What is the maximum usable fuel capacity for each wing tank?
5717 pounds
What is the maximum fuel tank temperature?
52
What is the minimum fuel tank temperature?
-40°C
