A police commissioner has been forced to defend his use of a taxpayer-funded helicopter after details emerged of another undeclared flight.

Victoria Police Commissioner Mike Bush has denied allegations he and his wife misled taxpayers about the extent of his use of the police aircraft.

The controversy comes just weeks after he apologised for using the police helicopter to travel from Melbourne to Hobart for a meeting with his national and trans-Tasman counterparts.

Mr Bush accepted responsibility for making a wrong decision about the October 20 interstate trip, saying the move didn't pass the pub test.

At the time, he said he had only previously used Victoria Police's air wing for a plane flight to Porepunkah after the death of two police officers in August.

It has since emerged that

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