A transitional security interest (TSI) is an interest in personal property that, in substance, secures payment or performance of an obligation which existed prior to 30 January 2012. TSIs also include security interests that didn’t exist at 30 January 2012, but were created under a security agreement that existed prior to 30 January 2012 and continued to exist after that time.
See section 308 of the PPS Act for the definition of 'transitional security interest'.