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A faulty fuel system caused a Royal Australian Air Force plane to crash at a Victorian military base last month.
Two pilots were forced to eject when the plane lost power while climbing from the runway before crashing in an open field beside the base in East Sale.
The RAAF's aerobatic display squadron, the Roulettes, use the PC-9/A planes and remain grounded while the crash is investigated.
The PC-9/A planes are also used for pilot training.
"The ongoing investigation into the RAAF PC-9/A crash ... has revealed the crash was caused by loss of engine power as a result of the failure of a component in the aircraft's fuel system," Defence said in a statement on Monday.
"The Aviation Accident Investigation Team (AAIT) will continue to analyse the aircraft to confirm there were no other factors that contributed to the power loss."
Defence said it will now work with its maintenance contractors and engine manufacturer, Pratt and Whitney, to determine the cause of the failure.
"This will inform any further engineering and maintenance work that may be required to the component," it said.
"Once this is completed, and no other factors are found by the AAIT, the PC-9/A will be cleared to return to flying operations."
Flying instructor Bruce Collenette, 45, and trainee instructor Steve Andrews, 28, were hospitalised with minor injuries after they ejected from the plane's cockpit.
Defence confirmed both are now out of hospital.
The injured pilots were on a routine training flight when the plane went down on May 18.