Fuel System Flashcards
(25 cards)
How many tanks make up the airframe fuel system
5
Within the fuel system locate: The No. 1 and Mo. 2 booster pumps
Largest item on the collector tank sump No. 1 is left, No. 2 is right
Wihin the fuel system locate: The transfer pumps
Two identical items on the forward tank sump
Wihin the fuel system locate: Transfer manifold
Under the cabin floor between the forward and collector tanks
What is the purpose of the forward tank?
Supplies fuel to both collector tanks
What in the main fuel tanks is used to sense the fuel contents display on the System Management Display (SMD)?
Two fuel contents probes
Where is the fuel management panel located?
On the overhead console in the cockpit
Where is the fuel system master DEFUEL/OFF/REFUEL switch located?
On the fuel management panel
With AUTO selected on the fuel management panel, how is the fuel transfer pump operation stopped?
When the forward tank mid-level switch and again when the forward tank low-level switches are made
What indications are shown on the fuel management panel in the event of a booster pump failure?
Yellow LOW caption
When crossfeed has been selected what colour line joins the main tank and engine legends on the System Management Display (SMD)?
Magenta
How is operation of the fuel jettison valves indicated to the aircrew when the jettison switch is selected to “OPEN”?
Via a green “OPEN” associated indicator on the fuel management panel
At what level does the total fuel contents histogram on the fuel display change from green to yellow?
100 kg
How are the fuel contents distributed about the aircraft Centre of Gravity (CG) during normal helicopter usage?
The fuel system is configured to automatically maintain the aircraft within its CG limits
What is the function of the low-level float switch in the forward fuel tank?
To switch off the fuel transfer pumps (when selected to AUTO) and motor the transfer valve to the main OPEN position when the forward tank is empty
When the fuel jettison switch is selected to OPEN, what is the fuel jettison valve’s approximate average rate of flow?
67 kg/minute
When would fuel flow out of the main fuel tank vents?
If a high-level float switch fails during pressure refuelling
What fuel tank function has a maximum operating pressure of 3.8 bar (55 psi)?
Pressure refuelling
What are the primary requirements of the fuel system?
Store fuel, provide a positive fuel supply to the engines and maintain Centre of Gravity (CG) during flight
When will a fuel low caution appear on the WCA alerts window (1, 2 or both)
47 kg of fuel in the respective collector tank
What is the operating purpose of the Nonreturn Valves (NRV) on the fuel manifold if a booster pump fails and crossfeed valve is open?
To prevent fuel recycling into an opposite main tank
How is pressurised fuel supplied to the engines if a single booster pump fails?
By opening the crossfeed valve
Where on the aircraft does the fuel jettison from?
A plastic tube, trailing edge of the left sponson structure
