The Ayers Corporation S2R-G10 Thrush aircraft type had a published maximum take-off weight that was not practical for agricultural use, increasing the risk that pilots would operate the aircraft above the published maximum weight and potentially at unsafe weights.
The STC should enable pilots to use a practical and proven weight limit for the S2R-G10 Thrush, and provide any other necessary operational or maintenance restrictions associated with flying at the higher weights.
In June 2012, Statewide Aviation, the Australian distributor for Ayres aircraft, in consultation with the Civil Aviation Safety Authority, commenced developing a Supplemental Type Certificate to permit an increase in the maximum take-off weight of a number of Thrush variants, including the S2R-G10, to 10,500 lb (4,673 kg). This certificate is expected to be available to Thrush owners in October 2013.
The ATSB is satisfied that the action taken by Statewide Aviation will, when implemented, adequately address this safety issue.
