FUELING Caution light remains on

[KenG 492]

Falcon 50 2.0b P3dv4.5HF2. The FUELING caution light remains on no matter what I do. That means the wing tanks will not feed because the airplane fuel system is stuck in fueling mode. 

[julian46 21]

Check your D-BUS - I think it needs to be in the vertical position

[KenG 492]

27 minutes ago, julian46 said:

Check your D-BUS - I think it needs to be in the vertical position

That was it. Thank you very much... I did not realise that TIED meant vertical. 

[julian46 21]

15 minutes ago, KenG said:

That was it. Thank you very much... I did not realise that TIED meant vertical. 

lol - I'm new to the Falcon too - I just found that about 15 mins before you posted (in the manual) - also I had LO FUEL for a while during current flight - then it went out - (during same flight) - not sure yet what to do with that one (I fueled to LO before departing then it came up a few mins into the flight)

Edited May 9, 2020 by julian46

[KenG 492]

Transfer and boost switches need to be up. XFR lights out.

[julian46 21]

yea - I had them set like that - and the light just went out on its own

 

[julian46 21]

Not sure if you have the RealityXP GTN 750 - it integrates really well with this aircraft - I have it running on an IPAD as well using space desk (just like on their Learjet)

IMAGE-HERE

[JRBarrett 3,049]

26 minutes ago, julian46 said:

yea - I had them set like that - and the light just went out on its own

 

If you wait a bit too long after engine start to turn the transfer switches on, you might briefly get the low fuel warning, but it will go away once the feeder tanks get replenished. 

The electrical bus tie switches can be a “gotcha” too. In the Falcon 50EX, Dassault simplified the system, leaving only the center bus tie. The outer bus tie switches are always set to be vertical. The center switch should be horizontal until all three engines are running, after which it should be rotated to be vertical.

[julian46 21]

Thanks - I noticed during startup with the center switch horizontal the voltage seemed higher (presumably better for the start) - then moved it vertical after all three running - really great plane - nice job FSW

 

[JRBarrett 3,049]

1 hour ago, julian46 said:

Thanks - I noticed during startup with the center switch horizontal the voltage seemed higher (presumably better for the start) - then moved it vertical after all three running - really great plane - nice job FSW

 

When running on APU power, or the GPU, only the right main bus is supplied directly. If the center bus tie is vertical on the ground, the left main bus will be getting power only from the number one battery. Turning it horizontal routes APU/GPU power from the right bus to the left.

Once all three engines are running, the right bus gets power from the number 3 generator, and the left bus from the generators on engines 1 and 2, so the bus tie can then be rotated vertical to the “flight normal” position to isolate the two buses.

The only time it would need to be tied in flight would be if you lost the #3 engine generator, or both the number 1 and 2 generators. 

After landing, the checklist calls to re-tie the center bus, so the APU can be started during taxi to the ramp, and it will then automatically supply power to both buses on engine shutdown.

[julian46 21]

Good info - thanks again