Fuel Systems Flashcards
How many fuel tanks does the airplane have?
2 integral tanks
Where is fuel tank temperature taken?
Left tank
What types of fuel pumps are in each wing?
- Primary ejector pump
- ACMP
- DCMP right tank
- 3 scavenge ejector pumps
What is the primary ejector pump?
Venturi pump
- No moving parts
- No electrical power used by onside engine
- Powered by motive flow
What is the purpose of the ACMP?
- Backup pump in case of primary ejector failure
- Engine start
- Crossfeed operations
What is the purpose of the DCMP?
Used for APU or engine start if AC power or the ACMP is not available
What is the purpose of the scavenge pumps?
Maintains fuel in the collector box
What pumps are used once the engine starts?
Associated primary ejector pump
What is the purpose of the collector box?
- Keeps the fuel pumps submerged
- Ensures constant fuel flow to the respective engine
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
Can fuel be transferred from tank to tank
or be dumped overboard?
No
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
What is the only way to close the engine shutoff valve?
Pull the associated engine fire extinguishing handle
When will the “FUEL 1 (2) LO LEVEL”
EICAS message be presented?
660 lb of fuel remaining in the associated tank
What is the Minimum Fuel Temperature?
- 40 degrees C
What is the Maximum Fuel Imbalance?
794 lbs.
What is the TOTAL Maximum Fuel Capacity?
20,935 lbs.
What is the Unusable Quantity per tank?
75 lbs. / 11 US gallons per tank
What powers the Refuel/Defueling panel before engine start?
DC Hot BATT Bus 2
How many fuel pumps exsist?
13 pumps total
Name the 13 pumps of the Fuel System
2 Engine Driven Pumps
2 Primary (Main) Ejector Pumps
6 Scavenge Ejector Pumps (3 on each side)
2 AC Electric Pumps
1 DC Electric Pumps
How many Electric Pumps are apart of the Fuel System?
3 Electric Fuel Pumps Total:
2 ACMP
1 DCMP
How many “Ejector” pumps are there in the Fuel System?
Name them, please.
8 Ejector Pumps:
2 Primary Ejector Pumps (Located in the Collector tanks)
6 Scavenge Ejector Pumps (3 in each tank)
What backs up the Ejector Pumps?
AC Fuel Pumps
Which pump provides fuel to the APU when the EDP is not running?
ACMP 2
When do the ACMPs automatically turn Off after landing?
Speed less than 50kts
+60 seconds
When will ACMP 1 and 2 automatically activate?
Ground: Flaps > 0 AND
TL set to T/O …. or …. Ground speed > 50 kts
Flight: Engine/EDP failure
Flaps > 0
