Fuel Flashcards
Backup to scavenge pumps?
Gravity flapper valves
Left fuel boost pump… What bus?
Dc batt bus
Therefore left eng start if battery start
Backup to main ejectors?
Fuel pumps
Qty MLI’s?
Left wing…2
Right wng..2
Ctr ……….1
Fuel temp sensor located?
Right wing
Scavenge ejector?
Wing to collector tank
Main ejector?
Collector to engine
Transfer ejector?
Center to wing
Apu fuel pump location?
Left collectot tank
If failure of pump?
APU has suction feed capability
What provides fuel to respective side engine?
Main ejectors
When is fuel transferred
Center to wing?
When wing is less than 93%
Transfer ejector opens
Closes when 97%
Bulk fuel temp read from?
Rt wing tank
How many scavenge ejectors/ tank
2
Only 1 shown on synop
NACA scoops?
Vents tanks to atmosphere
Fuel transfer is from_____to______
Provided by_____?
Fuel”transfer”is from center to wing
By transfer ejectors
Powered crossflow?
Wing tank 200 low
Until 50 over
What’s automatically controls refueling powered fuel crossflow and fuel transfer
FQFC
fuel quantity gauging computer
What calculates fuel quantity in each tank
Fuel quantity gauging computer(FQGC)
How many fuel probes?
Six probes in each tank
One probe in each collector tank
Three probes in the center tank
Fuel temperature is continuously monitored by a sensor installed in the?
Right wing tank
Where are the collector tanks located?
Two collector Tank’s are located in the forward section of the center wing tank
Capacity of collector tank?
10 gallons
Function of the NACA scoops?
Vents the tanks to the atmosphere to prevent pressure buildup caused by refueling
Ram air slightly pressures the wing tanks Inflight
What supplies fuel to the collector tanks?
Scavenge ejectors
What supplies fuel to the engines?
Main ejectors
In the event of an APU pump failure?
A negative gravity relief valve allows fuel
The valve opens when a negative gravity condition exists or when the APU pump fails
How is the fuel heated?
Via the fuel oil heat exchanger
Hot engine oil heats the fuel
Fuel imbalance?
300 pounds on takeoff
800 pounds other phases
Powered crossflow?
200 pounds low to 50 pounds over
How many MLI’s?
Two in each wing tank
One in the center tank
Pressing in the fuel pump switches?
Arm the fuel pumps
Center tank fuel limitation?
4400 4400
500
If more than 500 in the. Center tank we must have more than 4400 in the Wing tanks
Below what engine fuel temperature is take off prohibited?
+5c
The engine fuel SOV is controlled by?
The ENG FIRE PUSH button
The APU fuel SOVis controlled by?
PWR FUEL SWITCH
APU FIRE PUSH
Which fuel boost pump is operational during a battery start?
The left boost pump
Are there any EICAS messages When there is fuel transfer from the center to the wing tanks?
No
What is reqd ( elec system)for pressure fueling?
DC PWR
Fuel pumps operate when?
Low fuel pressure
Engine starts
Where are the collector tanks located
In the center tank at a point that is lower than the left or right wing tanks
The Apu pump take fuel from where for the APU
From the left collector tank
What supplies fuel to the engine’s when a main ejector pressure is low
DC electric boost pumps
The fuel system computer controls the operations of the fuel system
..
Apu and engine sovs are electric
..
Anytime the crosstie closes?
All ties close
QRH??Priority of multiple messages?
Electrical
Hydraulics
Pneumatics
Other
