Word is that he was in the hover (or taxiing slowly) and 'lost it' when reaching down to change frequency
Not a bad pilot, but overly concerned with his ability to hover after his previous accident. Only just moved into a hangar at Archerfield: the day before
On an operational note, I'd be more concerned at AF Tower closing the field for nigh on one hour, of which 40+ minutes were waiting for Archerfield Airport Corporation to attend and clear the area and runways for continued operation. The thieving ratbags charge enough to anyone wanting to use their development site, the least they can do is to attempt to provide a service for the charges they make
