The investigation into what caused a fatal plane crash on Australia Day in Perth has analysed other disasters including the 2015 Shoreham Airshow crash in the UK that killed 11 people.
Perth pilot Peter Lynch and his passenger and partner Endah Cakrawati died when the Grumman G-73 amphibious aircraft crashed into the Swan River during the City of Perth's annual Skyworks event on Australia Day.
The seaplane nose-dived into the water about 5pm in a plunge the Australian Transport Safety Bureau said was "consistent with an aerodynamic stall".
The plane broke on impact in front of hundreds of horrified witnesses gathered along the Swan River foreshore to watch an air display Mr Lynch was part of in the lead up to the fireworks show.
In a statement to WAtoday, the Civil Aviation Safety Authority said Mr Lynch's aircraft was operating as part of an approved air display, which was given special permission to operate.
Immediately after the crash, the ATSB began an investigation and is now probing the "planning, approval and oversight of the air display", sifting through years of data for the Perth event and other air displays across Australia, as well as "procedures and guidance relating to Civil Aviation Safety Authority (CASA)-authorised air displays".
As part of its inquiry, the ATSB analysed the Shoreham Airshow crash, in which an ex-military Hawker Hunter jet aircraft failed to complete a loop manouevre and crashed into a highway, killing 11 people on the ground and injuring 13, including the pilot.
The final report of a UK investigation into that crash concluded it was caused by pilot error, with the aircraft too low to safely complete the loop.
The Shoreham Airshow crash killed 11 people on the ground.
For the Perth crash, the ATSB had previously said it had "not identified any evidence to indicate that pilot incapacitation or aircraft serviceability were contributing factors to the collision with water".
However, it looked at the Shoreham crash to compare the approval processes and safety regulations for airshows around the world with Australia.
An ATSB image showing the flight path of the plane over the foreshore and river.
"Preliminary analysis of this information has identified differences in the approval process within CASA, between civil and military (including combined) displays and between Australia and other countries," the ATSB said.
"The ATSB is continuing to analyse this information, to determine whether there are any systemic safety issues in relation to authorised air displays."
The investigation is continuing, with a final report expected to be completed by January 2018.
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