FUEL Flashcards
If 1 pump fails
When the fuel pressure drops below 6.5 psi, the remaining pumps are automatically switched on and cycling, until the pilot selects other pump
APU Shut Off
- Master switch
- Extinguisher
- Stop button
- Fuel shut off
- Master — wing root
- Stop — at APU
- Extinguisher — wing root
- Fuel shut off — wing root
Fuel vent system consists of:
- NACA air inlet
- Vent (surge) tank
- 2 Venting float valves
Can you fuel without ground power?
Yes: with batteries or over the wing
ICAS msg: FUEL EQ XFEED OPN
Xfeed is selected “LOW2/1” within 100 lbs of each tank
What stops fuel from going away from the collector box
Flap valves (flappers)
How many pumps per tank?
3 Electric
1 Ejector pump
Where are the venting float valves located?
- At the vent (surge) tank
2. Just outside the collector box
What powers fuel pumps?
Pump A on side ESS
Pump B x-side ESS
Pump C on side DC
Purpose of ejector pump
Keep the fuel flow to collector box
What prevents fuel from going into the tank?
Check/relief valve
If all pumps fail
Engine-driver fuel pumps will provide suction feed up to FL250
Tank Capacity
- EP
- LR
- XR
- EP 9,200 lbs
- LR 11,434 lbs (5717 per side)
- XR 1,863 lbs ventral tank
What is the purpose of fuel vent system?
It prevents the build up of positive and negative pressure in the tank
How can we use fuel from left tank to supply the APU?
Crossfeed to Low2
