Fuel Systems Flashcards
How many KG of fuel are left in the collector tank when the low level warning goes off?
47kg
What are the functions of the low level float switch in the forward tank?
Stops the transfer pumps and moves the 3 way transfer valve.
Fuel bars have gone yellow, how many KG’s left in total
100 KG
What other indications do you get when you get a low level caution?
Yellow box on the reduced fuel info.
What causes a magenta line on the fuel display between main tanks?
When crossfeed is operated.
Where is the fuel manifold?
Front of the aft bay above the top shelf.
Where is the switch that operates “Low” indication on the booster pump button?
On the Fuel Manifold.
Where is the fuel manifold?
Front of the aft bay.
Where is the fuel transfer manifold?
On the transfer pump in between the forward and collector tank on the right hand side.
Where is the fuel management panel?
OHP
What electrical supply do we give to the booster pumps?
DC Essential BB.
How do you gain access to a main tank probe?
From the footstep access panel.
What is the purpose of the high level float switch in the main tank ?
Stops the re-fuel, (de-energises the fuel shut off valves). Also illuminates light on refuel / defuel panel.
What is the purpose of the forward tank?
To hold fuel and supply fuel to the engines via the collector tanks.
How would you describe the construction of the main tanks?
Flexible bag tanks held in rigid bays by poppers.
What indications come on when fuel reaches 47Kg in each collector tank?
[FUEL 1 LVL] [FUEL 2 LVL]
How many fuel tanks are there?
Five, 2 Main, 2 collector, 1 Forward.
What controls the transfer of fuel from the main tanks?
Transfer Valve.
What is the purpose of the FCU?
Converts analogue fuel probe signals into a DC voltage signal.
What is the max pressure for refuel?
55 Psi.
What is the maximum pressure for Defuel?
11 PSI
At what pressure does the booster pump operate?
0.7 BAR
How many high level float switches have to operate to stop refuel.
1.
What is the purpose of the FCU?
Converts analogue fuel probe sigals into a DC voltage signal
What does the fuel manifold comprise of?
2 NRV
2 Booster pump pressure switches
3 Actuator operated fuel cocks (2 LP cocks and 1 cross feed)
Yellow ‘LOW’ on transfer buttons appears when?
Fuel pressure drops below 0.17 bar.
If No1 booster pump fails what indication would you get?
Low on the booster pump switch on overhead panel.
Where is the master refuel/defuel switch?
OHP. Has to be in correct position to refuel or defuel.
