How do you dump fuel from an aircraft within FS9? Or is it not possible???
Also, is it possible to declare an emergency to air traffic control within FS9, or is that something that you can only do with an add-on like FSPassenger???
The answer to both is : not possible 😀
If you want to dump fuel your best bet is to get a payware airliner, but only those that would have fuel dumping capabilities in the first place! The PMDG 747's fuel dump system is really superb, and even lets you set a limit as to when to shut the fuel dump off!
Declare an emergency in FS9 is not possible yet. You can do so by buying addons that have that feature.
As for dumping fuel, you can do that even with freeware aircraft. But you need a panel that has that option. The Ken Mitchell panels for Airbus have that feature.
Here are free downloads for a dump fuel panel or gauge. Let us know if they work out.