like i mentioned it before as well, those stains came from OIL drains, not Fuel drains.
Fuel system is a very complicated thing, but i assure you it doesn't work the way you suggested.
And this is a PT-04
you can see the flares are installed, or at least that yellow cap is gone.
It is odd why PAF still hasn't installed chaff/flares on it.
Please enlighten me with some prove that it is oil drains... Why will an RD93 dump oil in the air?