To add the MAFFS (Modular Airborne Fire Fighting System) red retardant liquid drop effect to your C-130 aircraft (or any other aircraft you like to use as fire-fighter):
(1) Copy the "fx_maffs.fx" file to your "effects" FS 2002 sub directory;
(2) Copy the following lines into the "aircraft.cfg" file of your fire-fighter aircraft (they are suitable for Premaircraft C-130s, visit Premaircraft web site at http://www.flightsimnetwork.com/premaircraft/):