This aircraft was a -310 Navajo.
Are you absolutely sure about that? The CASA aircraft register has it as a PA-31 - not a PA-31-310.
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Power Driven Aeroplane with TRICYCLE-RETRACTABLE landing gear
2 Piston engines
Manufacturer: PIPER AIRCRAFT CORP
Model: PA-31
Serial number: 31-7812064
Aircraft first registered in Australia: 01 November 1985
Year of manufacture: 1978
Full Registration
Registration holder as of 02 May 2006
LUCAS, David
PO Box 143
BRIGHTON SA 5048
AUSTRALIA
Registered operator as of 02 May 2006
LUCAS, David
PO Box 143
BRIGHTON SA 5048
AUSTRALIA
DF.