AI sound and contrail poblem

[Dutch64]

Thanks to Savas' post i remember now, the problem is caused by fs2002 contrails copied there by one or more of your addons. Get from your disk 1 of
fs2004 the files fx_contrail_l.fx and fx_contrail_s.fx . Copy these files to your main effects folder (overwrite when asked to do so) and you're all set.