Papua New Guinea accident investigators have retrieved the black box of a Trans Air charter flight that crashed on a remote island, killing three Australians and a New Zealander.
The sole survivor of Tuesday's crash on Misima Island, the 25-year-old co-pilot named as Kelby Cheyne in the Australian media, has been flown to Townsville for hospital treatment.
The New Zealander with permanent residency in Australia is being treated for heavy bruising and a broken leg.
PNG's Civil Aviation Authority's air safety director, Wilson Sagati, says a crew is on the island, off Milne Bay, to inspect the site but it is still too early to say what went wrong.
A team of three Australian Transport Safety Bureau investigators is expected to arrive on Misima later today to help the investigation.
The dead were Chris Hart, a marine pilot, Trans Air co-owner and the plane's pilot, Les Wright, civil aviation flight operations inspector, Darren Moore, and an employee of the medivac company, International SOS, a New Zealander who is yet to be named.