The funeral will take place at Wanaka Airport at 2pm on Saturday.
Mr Wallis was killed alongside Department of Conservation workers Paul Hondelink and Scott Theobold in the crash, which happened moments after the helicopter took off from the airport.
Dates for funerals for the other two men have not been confirmed.
The remains of the men were taken to Christchurch for postmortems on Friday, and families earlier said they were waiting for the return of the bodies before they can set a date for funerals
The helicopter wreckage is now in Wellington being examined by the Transport Accident Investigation Commission.
A spokeswoman for the Ministry of Justice declined to discuss the matter with the Otago Daily Times.
Commission senior communications adviser Simon Pleasants said it appeared the helicopter had fallen from ''high up'' and created a crater about a metre deep.
''The helicopter hit the ground hard and dug into the ground.''
It was usual for helicopters to climb quite rapidly to over 600m after takeoff before climbing more slowly.
Two investigators were still in Wanaka talking to witnesses and the operator, Alpine Helicopters.
Maintenance and ''other relevant'' records were also being gathered from helicopter owner Airwork, whose headquarters are in Auckland.
''They are the owners of the machine. They leased the machine to Alpine Helicopters.
''On the face of it, that's what they did; I've yet to see the lease agreement and that sort of thing.''
''We talk to the owner, we talk to the operator, we talk to the people who maintained the aircraft, we look at its history ... there's a lot of evidence gathering that happens.''
Mr Pleasants said it would be normal for the evidence gathering to take six months.
