On 12 January 2012, the holder of the Supplemental Type Certificate (STC) permitting operations up to 6,600 kg take-off weight advised the ATSB that the design would be reviewed to assess and address any excessive c.g. variation that may occur as the result of hopper payload and fuel usage during a flight.
In addition, they planned to advise all operators using the STC of the potential for excessive c.g. variation.
The ATSB is satisfied that the actions taken and proposed by the ATSB, CASA and STC holder will adequately address the safety issue.