170 Fuel

  1. How many fuel tanks does the airplane have?
    2 integral tanks
  2. Where is fuel tank temperature taken?
    Left tank
  3. What types of fuel pumps are in each wing?
    • • Primary ejector pump
    • • ACMP
    • • DCMP (right tank)
    • • 3 scavenge ejector pumps
  4. 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
  5. What is the purpose of the ACMP?
    • • Back-up pump in case of primary ejector pump failure
    • • Engine start
    • • Crossfeed operations
  6. What is the purpose of the DCMP?
    Used for APU or engine start if AC power or the ACMP is not available
  7. What is the purpose of the scavenge pumps?
    Maintains fuel level in the collector box
  8. What pump(s) is used once an engine is started?
    Associated primary ejector pump
  9. What pump(s) is used once an engine is started?
    Associated primary ejector pump
  10. What is the purpose of the collector box?
    • Keeps the fuel pumps submerged

    • Ensures constant fuel flow to the respective engine
  11. What is the 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
  12. Can fuel be transferred from tank-to-tank or be dumped overboard?
  13. 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
  14. What is the only way to close the engine fuel SOV?
    Pull the associated engine fire extinguishing handle
  15. When will the FUEL 1(2) LO LEVEL EICAS be presented?
    660 lbs of fuel remaining in the associated tank
  16. Fuel route from tanks to engine
    Leaves fuel tank and divides into two paths.

    One flows through the low-pressure pump and then returns to the fuel tank as motive flow.

    The second flows through the fuel/oil heat exchanger to the fuel filter. Then flows to the Fuel Metering Unit and passes through the high pressure pump and back to the FMU.

    The FMU sends the fuel to the injectors or the CVGs.
Card Set
170 Fuel
170 Fuel