Interesting read:
Investigation: AO-2014-114 - Collision with terrain involving DHC-1, 'Chipmunk' VH-UPD near Coffs Harbour, NSW on 29 June 2014
I find it interesting the report does not mention the manufacturers TNS on Chipmunk spinning. TNSs (Technical News Sheet) are the manufacturer's version of a service bulletin / AD, the ATSB has quoted various articles written about spinning the DHC-1, but not the official one!
I believe TNS 142 should be a mandatory issue to all pilots flying the Chippy.