Victoria's top cop is facing further scrutiny over a second chopper ride as revelations emerge his wife also took a trip on the police Air Wing.

Chief Police Commissioner Mike Bush again defended his use of the taxpayer-funded police helicopter after it was revealed he used it another time for a demonstration on July 29.

The second helicopter ride was not non-operational travel and was necessary to ensure Bush could familiarise himself with the technology after he began his tenure, Victoria Police said.

Bush's wife Vicky also took a flight in June alongside two visiting police officers from New Zealand.

"I have only used the Victoria Police Air Wing helicopter once for non-operational travel," Bush said in a statement.

"This was in relation to a recent trip to Hobart and I have

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