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Reference material - https://www.smartcockpit.com/docs/CL605-FUEL_SYSTEM.pdf Page: 16 Fuel tanks are expected to be within 400 lbs / 181 kgs of each other on taxi / takeoff / landing OR 800 lbs / 362 kgs during flight, to avoid Fuel Imbalance EICAS message. First, orient yourself on the overhead panel, we'll be working in the 2nd row (or middle row) of the FUEL panel area. (Fuel.PNG) All three of these buttons should be extinguished under normal operations. Gravity XFLOW Press to begin the process, there's a 1 second delay after pushing the button for it to illuminate OPEN. This will allow fuel to flow freely between both main (wing-based) tanks. There is no EICAS notification that this is open/occurring. (gravity.png) To observe what's happening in the sim. You can go to the Challenger 650 menu -> Study -> Engines -> Fuel System... You'll notice that whatever Main Tank (either Left or Right) has more fuel that this will continue to consume, whereas the side with less fuel will not. Thus balancing the tanks. L (R) to AUX XFLOW Press the appropriate button to begin the process, there's a 1 second delay after pushing the button for it to illuminate ON. This will remove fuel from whatever side is select and transfer it to the auxiliary tank. Determine which tank has more weight in fuel Left side? Choose L to AUX (L to AUX.png) Right side? Choose R to AUX (R to AUX.png) There is a lock out mechanism that does not allow you to press the opposite button when one is already selected. Pressing L to AUX, for example, then pressing R to AUX, will no longer illuminate the L to AUX button. Pressing the R to AUX button again will resume the L to AUX transfer and the button will illuminate ON again. Once you're done balancing the tank, make sure to deselect the previously selected L (R) to AUX button. The aircraft will now suspend fuel consumption from the two main tanks and pull from the AUX tank until depleted. *Edit* Thanks! @airforce2 As long as a main tank is below 93% full, the aux tank feeds the main tank to maintain the level at 93%. Once a main drops to 93%, the main quantity will remain constant and the aux level will drop. It will appear that the engines are burning from the aux tank, but in reality the engines are burning from the mains and that fuel is being simultaneously replaced in the main tank from the aux tank ejector xfer pumps. To observe what's happening in the sim. You can go to the Challenger 650 menu -> Study -> Engines -> Fuel System... Note: The plane will display an EICAS warning message: FUEL XFLOW SOV OPEN if either button is ON for more than 50 seconds and the tanks are balanced within 100 lbs.

Not at this time. Editing it is possible but is very much a “at your own risk” endeavour. Good luck!

that doesnt work, due to the completely custom fuel system little navmap can't read the values or did I miss something since I last attempted to do it

Noted. Will fix for a coming update.

Or put “L” into the ALD box to change it to LFL, as explained in the FMS Primer doc.

Hi, during a cold-weather start up, you can start the aircraft APU at -40°C, ensuring that you have a minimum of 22 V for your APU showing on your DC electrical page. You can also start your engines at -40°C, when you do this, you will likely have a very high oil pressure during the start and obviously a low oil temperature. You do not want to increase the thrust until you have oil pressure in the green! The engine oil temperatures must be in the green for takeoff. There is a note for oil pressure that after cold start you might see 156 psi, 130 psi at idle for 10 minutes maximum. It also states that engines must remain at idle until oil pressure returns to within the normal range. Another cold-weather consideration is before the first flight of the day when the airplane is called soaked and an ambient temperature of -30 or below for more than eight hours, the engines must be motored for 60 seconds, and fan rotation (N1) must be verified, before the engine start is initiated. Thrust reversers must be actuated until deploy install cycles are less than five seconds. So to summarize you can start if the temperature is -40°C, you must have 22 V or greater for the APU to start, once you start the engines, as mentioned you were going to have a high oil pressure, low oil temperature, You should not increase the Thrust of either engine and (remain at idle) until the oil pressure returns to normal. As far as takeoff, the oil pressure and the oil temperature all have to be in the green. Hope that helps, Rob

Ops Reference manual has some clues too. In the documentation folder.