New Zealand authorities have secured the black box data from the LATAM flight from Sydney to Auckland on Monday.
The Boeing 787-9 dropped suddenly about two-thirds of the way across the Tasman, flinging un-restrained passengers into the air and injuring up to 50.
Passenger Brian Jokat says the pilot told him cockpit gauges went blank.
New Zealand's Transport Accident Investigation Commission says it is assisting Chilean authorities.
Aviation lawyer and former head of the US National Transportation Board Mary Schiavo spoke to Ingrid Hipkiss.
