Fuel System Flashcards
What are the minimum and maximum fuel temperatures?
0 celsius and 71 celsius
What are the indications if the fuel temperatures are out of limits?
Temperature digits change to amber or red
How is fuel quantity measured for display on the MFD’s and ED?
- on MFD’s, analog readout of fuel quantity in LBSx1000 per side, and digital display of total fuel in 10lbs increments.
- on ED, digital display of fuel per side in lbs, 10lbs increments
How does the magnetic dip stick work?
- accessed at the bottom of the wing
- When the rod is released, it moves slowly down until the rod magnet is attracted by the float magnet.
- The fuel quantity is shown in US gallons or in litres.
What is the maximum lateral fuel tank imbalance?
- 600 lbs
What will be the indication of a tank imbalance?
- yellow BALANCE msg flashing, and yellow fuel quantity digits on ED
How is low pressure provided in the fuel system?
A primary ejector pump in the collector bay supplies fuel at a constant low-pressure to the engine.
How does fuel get from the main tank to the collector bay?
TWO WAYS:
Fuel scavenge ejector pumps pull fuel from the main tank low points, and pump it into the collector bay.
Several flapper check valves allowing only one-way flow into the collector bay, are located in the base of the partition between the main and collector bay. The flapper valves ensure a constant gravity-fed fuel flow into the collector bay.
What is the purpose of the dump valves?
- The vent/dump valve allows air to vent from the tank as it fills, and prevents damage should the tank overfill due to failure of both normal and back-up shut-off features.
How do the dump valves open?
- During pressure refuelling, fuel pressure opens the vent/ dump valve in each tank to vent the tanks through the surge bay.
Where are the dump valves?
They are located in each main tank and vent to the surge tank.
Dump valves automatically open and remain open to allow fuel tank venting whenever pressure refuelling is in progress.
When does the TANK FUEL LOW caution light illuminate?
- When the park brake is off
- related collector bay level drops below approximately 350 lbs
- related engine is operating
What is the purpose of the NACA vents?
- located in the surge bay, they protect against overfill during fuelling by spilling the excess fuel overboard through the vents.
What is the consequence of taking off with the FUELING ON caution light?
Refuelling door under the Right Nacelle is open.
The FUELING ON caution light is the only caution light that is not accompanied by the illumination of the MASTER CAUTION light.
What is the total usable fuel quantity?
- 11,724 lbs, 5,862 lbs per tank.
