I messed around with fuel dumping back in the v0.x days of the 777, I found it to be great. I will try to get it in here using pics on what I did, but it will take a while to get it done (as long as I don't forget to do it).

* Markoz makes a mental note to NOT forget to do this!

When I messed with it before, I don't remember seeing fuel being dumped out of the plane, but looking at the fuel display, I could see that fuel was being dumped.

I think I set the fuel to what  wanted remaining, and let it dump until it got there, once there, the dumping was stopped automatically. I even wrote about it in the forum and how good it worked.

I was doing it at about FL260-FL300, so I have contrails and can't tell if there is an effect or not.
I'll try again at a lower altitude where there is no contrail.

Okay. Here is what you need to do.


Pic #1
Open the DSP (Shift+4) and click on the FUEL button. This will display the fuel in the currently selected ND. In Pic #1 above, I have chosen the Lower Center Display.


Pic #2
Click on the Fuel Jettison ARM Switch, so ARM appears on it. In Pic #2 above, you can see that the Fuel Jettison indicators are now showing in the FUEL Display.


Pic #3
Now you have to MIDDLE Mouse Button click on the Fuel To Remain Selector (knob). The FUEL Display now shows the Fuel Jettison information.


Pic #4
RIGHT Mouse Button click on the Fuel To Remain Selector to increase the amount of fuel to remain. It starts of at 0.0 to remain, and if you don't increase it, ALL your fuel will be jettisoned! In Pic #4 above, I have chosen 60.3 (60,300 pounds) to remain. I tried to stop it on 60.0, but it was too hard to achieve. Once you have set it to the amount of fuel you want to remain, LEFT Mouse Button click on the Fuel To Remain Selector until it is centered! Do not Middle Mouse Button click on the Fuel To Remain Selector because it WILL return it to 0.0! So leave it alone until the fuel jettison process is finished.


Now press the 2 Fuel Jettison Nozzle Switches ON. The Fuel jettison will start. It will automatically switch OFF once the amount of fuel that you have selected, in the previous step, which in my case was 60.3.

It really is quite simple to do.

Sorry about my previous post, where I said I had written about it before. I written about messing with it, but I had not explained how I had done it.

WHEN TURN KNOB STAYS AT  0.0
USING -300ER MODEL

markoz is there a setting i can not dump fuel it stays at 0.0 and there is no effect