Exellent! Thank you very much! I will report back any results!

EDIT:

A quick summary after some tests. Using above suggested settings, i am now suffering even worse from engine malfunctions. Of 5 missions, i have force landed 4 times. AI flight members have force landed 2 times. So in 5 missions with 2 machines in every flight, it is in total 6 engine breakdowns, on the other hand, there has been no fires as of yet.

I wonder what value did increase the risks though.

It should be noted that all testing has been under AI control (exept final approaches on forced landings)