I believe the ASIS at MTG in 2001 was a PAPI, happy to be corrected though.
SN
It is a long story so PM me if you are interested in the details. At the time of the RDFS accident it was AT-VASIS. Soon after the accident when it was thought the pilot may have received confusing light signals, a NOTAM was issued and a note in ERSA added for Mt Gambier stated that caution should be used if using the T-VASIS since certain combinations of weather conditions could cause erroneous T-VASIS indications. It was after that accident the decision was eventually made to replace the Mt Gambier T-VASIS with PAPI. Initially the PAPI was not to be used for RPT operations but is cleared now.