Fuel Flashcards
The crossed selector knob on LOW 1 get fuel from where? sends it where? with what pump.
Activates Pump 2, sends fuel from right tank to both engines. Engine 1 receives more fuel than needed and this extra fuel is sent to tank 1 to balance out the fuel.
What is the max fuel capacity
20,935lbs
Max fuel imbalance between the 2 tanks
794lbs
Min Fuel Temperature
- 40 c
What Fuel Pump Provides the Primary fuel to the Engines
The Primary Ejector Pump
What are the AC Wing Pumps for?
- Engine Starts
- Fuel CrossFeed operations
- APU
- Back up to the Ejector Pumps
What is the purpose of the DC Pump
To provide Fuel to the APU or Engine start when not AC power is available.
What is the only thing that can close the Fuel Shutoff Valves
Red Fire handles
When does the FUEL 1 (2) LO LEVEL come on
660lbs in the associated Tank
Which pumps are the main Fuel Pumps for the engines
The Primary Ejector Pumps
What do the Primary Ejectors Pumps do?
Located in the Collector Tank providing fuel pressure in the fuel lines. Powered by motive flow, no moving parts
What do 3 Scavenger Pump Do in each main tank?
Maintain fuel adequate fuel level in the collector tanks
What tank is the fuel temp taken?
Left Tank
Where does APU gets its fuel from
DC Power and AC Power
DC - DC Pump
AC - AC Pump right tank
Where does the DC FUEL Pump get its Electric power from
DC ESS BUS 2
During crossed feed operations how does the low fuel tank get fuel from the hight side?
When the crossfeed knob is selected to LOW 1 or LOW 2, the amount of fuel supplied to the lower level side is higher than the actual fuel burn of the engine on that side. This characteristic causes fuel to be transferred from one tank to the other.
How Much fuel in the collectors tanks
660lbs
In the Auto Position, when does AC Fuel Pump 2 start up?
- Engine Starting
- Primary Ejector 2 Fails
- Starting the APU with no engine 2 started
- XFEED Selected to LOW 1
What AC FUEL PUMP does the RAT Power?
AC Fuel pump 2
When does the total fuel quantities turn amber
2640 lbs
When do the toot fuel indication turn red
1360 lbs
What is Minimum Fuel? Based on what factors and configuration?
- 45 minutes
- Clean, Green Dot, 1500’
What is Emergency Fuel? Based on what factors and configuration?
- 30 minutes
- Clean, Green Dot, 1500’
What position do the AC Fuel pumps need to be in, in order for the crossed system to work?
Auto position
If to much fuel is being sent to an engine what pump sends it back into the fuel tank?
the EDP
What can cause a FUEL IMBALANCE message?
- Excessive fuel flow in one of the engines.
- Fuel quantity from one tank decreases rapidly
- Big difference between EICAS Fuel and FM fuel.
What provides motive flow for the main ejectors?
The Engine Driven Pumps
When does the EICAS Caution Fuel imbalance come up?
800lbs
When does the EICAS Caution Fuel Imbalance message go away?
Less than 100lbs
