mountaineer keith woodford has his own ideas how new zealand's deadliest aviation disaster could haveeen avoided. >> if they had reacted 10 seconds earlier, there was a reasonable chance that the plane could have been able to climb out of it. so close. >> but why was the plane flying so close to the volcano? it turns out, the pilot and crew weren't where they thought they were. investigators discover that on the morning of november 28th, air new zealand flight ops changed 901's final flight coordinate. instead of flying their usual route down the middle mcmurdo sound, the jet was shifted over lewis sound and directly into mount erebus. >> coordinates shift meant that the airplane was over a place that the pilots didn't understand. clearly the pilots couldn't see the mountain, or they would have flown around it. >> in june 1980, the office of air accidents releases its findings, known as the chippendale report. it cites pilot error for flying at low level in an area of poor visibility when the crew was uncertain about their position. but in april 1981, a parliamentary investigation kno