Fuel System Flashcards
From which Fuel Tank can the APU receive fuel?
- Fuel is drawn from the Left Wing Fuel Hopper using the Left Main and/or Left Alternate Fuel Pumps
- Fuel can be drawn through the Crossflow Valve using the Right Main and/or Right Alternate Fuel Pumps
Total fuel capacity
29,500LBS or 4,370GALS
Fuel Tank Temperature Min
-40 C
Fuel Tank Temperature Max
54 C and above
Maximum Fuel unbalance
2,000LBS @ 55,000 gross wt
400LBS @ 60,500 gross wt
- What is the maximum capacity of each fuel hopper tank?
190 gallons (Approximately 1270 lbs)
- When a fire handle is pulled, where is the fuel shut off?
At the tank (engine fuel feed shutoff valve)
- How is pressure fueling terminated from the flight deck?
By selecting the left and right remote fueling shutoff switches to CLOSED
- Where is the amber “FUEL LEVEL LOW” indication displayed?
On the CAS
Standby fuel quantity indicator will display “LOW FUEL”
- What is boost pump auto change?
If one pump on either side is selected “OFF” and the operating pump fails, the
Selected Off Pump will automatically turn on
The corrective action is to match the switches to the condition
- What malfunctions or actions might cause a red “FUEL PRESS LOW” CAS
message to illuminate?
If the fuel pressure at the engine driven high pressure fuel pump inlet is less than
15 psi
A fuel leak in the engine fuel system
Both fuel boost pumps on one side turned OFF with the crossflow valve CLOSED
- What is the corrective action required if a red “FUEL FILTER” CAS message
illuminates?
Reduce power to 75% HP RPM on the affected engine and check for engine fuel
temperature increase above +5º C
- How is the fuel system configured with a dual converter failure?
One main boost pump selected ON with the crossflow valve OPEN
- What is the function of the pressure fueling static port underneath each wing?
To provide a static pressure reference for the tank pressure sensing valve in the
pressure fueling system
- What is the function of the remote fueling shutoff switches?
To control pressure fueling shutoff operation from the cockpit
- What are the normal indications on the fuel gauges with the standby fuel
quantity gauge selected to “TEST”?
An amber 7000 lbs indication on each fuel gauge with the total fuel gauges
reading an amber 14,000 lbs indication and flashing “LOW FUEL” message for
approximately 30 seconds on the standby panel and “FUEL LEVEL LOW” on the
CAS
- What is an acceptable source of fuel for the APU?
Either the left main or left alternate boost pump selected ON
Either the right main or right alternate boost pump selected ON with the crossflow
valve OPEN
- If both fuel boost pumps on one side were selected to OFF after engine start,
what would be the resulting indication?
A red “FUEL PRESS LOW” CAS message
- What is the function of the crossflow valve?
To supply fuel to both engines from one fuel tank, or to transfer fuel under
pressure to an opposite fuel tank through the motive-flow ejector pumps
- What is the function of the intertank valve?
To defuel the aircraft and to balance fuel
- What is the meaning of the “CB” indication in the boost pump switches?
This indicates that a boost pump circuit breaker has tripped on the power distribution box (PDB)
- Where is the location of the fuel boost pump circuit breakers?
On the power distribution box (PDB) in the forward radio rack, PRIMARY on the
ESS DC Bus and Alternate on the right main DC Bus
