SPAACARS version 2.3.3 is released now and available for download.
This version corrects an error in PAX/Cargo calculation that allowed negative cargo weight at certain times.
This version also makes changes to landing rate that might prevent erroneous readings that Steve S. has noted (although I'm not confident that I've solved this issue here). Note: This still uses the gauge reading of descent rate which lags behind the actual aircraft ascent/descent rate. I've been unable to figure out the other method of calculating actual aircraft descent rate thus far :think: .