AHII sounds should be at PCM 8 or 16-bit mono, 22kHz. Anything else can easily cause in-game problems such as lock-ups, CTDs, etc. All of your engine sounds are at 44kHz stereo. I recommend converting them or you might pass on the issues listed to players and converting them will also bring down the file sizes=less strain on a player's PC. The weapons, gear & such sounds all look alright, as I believe I've heard them in other packs already. Your engine sounds will work, they just might cause problems at that current format.
*poof*