Fuel System Flashcards
What is the source of motive flow for the transfer ejectors?
The high pressure output of the main ejectors
What is the source of motive flow for the main and scavenge ejectors?
The high pressure engine driven fuel pump
What will supply fuel pressure to the engines if the main ejector pressure is low?
DC electric boost pumps
What is the function of the scavenge ejectors?
Operate by motive flow and transfer fuel from the wing tanks to the collector tanks
What is the function of the collector tanks?
Keeps a full supply of fuel available tot eh engines at all aircraft attitudes
What is the location of the collector tanks?
Forward section of the center tank
How does the fuel move through the system to the engines?
Center tanks to the wing tanks to the collector tanks to the engines
What is the function of the transfer ejectors?
Transfers fuel from the center tank to the wing tanks
When does the fuel automatically transfer from the center tanks to the wing tanks?
The system starts transfer when the wing tank capacity drops to 94%
When is the fuel transfer from the center tank to the wing tanks completed?
When the wing tank is full, or the center tank is empty
What is the function of the fuel crossflow pump?
A bi-directional pump that is used to transfer fuel between the wing tanks
What is the function of the automatic power crossflow system?
Provides automatic transfer between tanks to compensate for an imbalance of more than 200lbs. The process ends when the previously low tank exceeds the high tank by 50lbs.
What is the function of the XFLOW AUTO OVERRIDE switchlight?
Inhibits the automatic fuel crossflow system
What is the function of the gravity crossflow system?
Opens a valve connected between both wing tanks to allow gravity to equalize tank quantities
When will the boost pump automatically activate if the switchlights are in the armed position?
Should a main ejector pressure fall below 10psi, then both fuel pumps are activated
