Umm, what kACARS version were you using. Becasue what I find with the new kACARS module does not work with the older kACARS, only works with 1.0.0.9 though.
Maybe try using kACARS 1.0.0.8 if you don’t want to change mostly and use the old module.
But let’s try the new kACARS 1.0.0.9 with the new kACARS module
Yeah I think so that could be the issue with php… Check with your hosting for about that. But I’m not sure about that. I never heard of iconv() on php. But check it out about that.