The Pacific Blue airline pilot convicted of flying carelessly out of Queenstown made a series of mistakes that "seriously impacted" on safety margins, says a judge.
Judge Kevin Phillips said "no reasonable or prudent pilot" would have tried to take off in conditions like the ones the 54-year-old faced on June 22, 2010.
The flight left for Sydney at 5.25pm when the light was poor, in cloud below the minimum altitude and in a heavy crosswind and also didn't have a suitable contingency plan - a clear breach of industry requirements.
The pilot, an Aucklander with 33 years' commercial flying experience, was found guilty of carelessly operating the Boeing 737 after a defended hearing over four weeks last year.
He has interim name suppression and will be sentenced later this year.