Hi Hyp...!
Unfortunately, in FS 2002 system failures can only be set-up in Menu > Aircraft > System failures.
They are always "timed" to fail, so it doesn't represent real flying conditions where temperature and dew point become so close together, while flying, so as to produce icing conditions, and therefore probable failures!
It is possible to set these conditions up in the flight sim and add-ons, but I don't think the program, (FS 2002), is designed to recognise them and react accordingly..
I REALLY hope it will be included in FS 2004......

...!
Cheers mate.....!
Paul.
(England).
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.