Foreign Affairs Minister Murray McCully said the aircraft had been the subject of "serious concerns'' amongst aviation experts.
"In the absence of an internationally respected certification process for Tongan conditions, it is the government's obligation to draw the attention of the travelling public to these issues and our Tongan travel advisory has been updated accordingly.
"The New Zealand Government has put support for the Tongan tourism industry on hold, and we will not be spending taxpayer money promoting tourism in Tonga until we are satisfied with the safety and reliability of this new air service,'' Mr McCully said.
"We are in discussions with the Tongan Government on this issue. I reiterate my offer of support to Tonga to assist them in ensuring aviation safety, a critical component of tourism in the Pacific islands.''