The Interislander ferry Aratere. Photo / Mark Mitchell
For the first time in eight months the Interislander ferry Aratere will cross the Cook Strait.
The ferry is scheduled to start freight-only services later this week.
Aratere has been in Singapore since March, where it has undergone testing and repairs, after losing a starboard propeller in November.
Read more: Aratere returns after costs of $25 million
The ship arrived back in Wellington two weeks ago and has since undergone sea trials and underwater inspections.
Maritime New Zealand and DNV have now signed off the ferry as ready to sail.
The priority was to ensure the ship is performing safely ahead of next week's planned return to full passenger services, KiwiRail chief executive Peter Reidy said.
"Under international maritime law, an extensive range of rules and regulations govern operational ships, meaning over the last week Maritime New Zealand and classification society surveyors, DNV, have put Aratere through an intense audit schedule to ensure she is safe to resume service."
Aratere would undertake a test run across the Cook Strait today and is scheduled to start carrying passengers from next week.
If for any reason Aratere was not ready for a first full sailing next week, the service was to be replaced by Arahura on the same schedule, said Mr Reidy.
KiwiRail have said the overall financial impact including lost revenue, charter of the replacement ferry Stena Alegra and cost of repairs is estimated to be between approximately $25 million and $30 million.
It's understood the crash involves a motorcycle and car.