Report from Raaus.
The aircraft took off from Bankstown for a private flight to the northern beaches. About 10 minutes before the incident, they started to fly up the coast, the fuel pressure started to fluctuate and drop and then would increase, the pilot turned the fuel pump on and changed the tank immediately. This did not change the fuel pressure reading, other than this there were no abnormalities. As the aircraft was climbing from 1000ft back to 2400ft to head back to Bankstown, approx. 20 seconds after full power the engine started to drop/ increase/ drop/ increase in RPM. The engine did not stop, but was not operating as normal. The pilot turned back EAST towards the coast and conducted a forced landing on the beach.