Nepalese investigators probing last week's plane crash near Mount Everest that killed 18 people, including two Australians, have interviewed several eyewitnesses and visited the accident site, a member of the team says.

Nagendra Ghimire said the government team flew over the weekend to Lukla, where the accident took place at an airstrip in the foothills of Everest, and talked to several people who saw the crash.

A De Havilland DHC-6 Twin Otter plane crashed and burst into flames as it tried to land in foggy weather at Lukla on October 8. It had flown from Kathmandu.

Australians Andrew Frick McLeod, 31, and his girlfriend Charlene Kate Zamudio, 24, died along with 12 German tourists, and four Nepalese when the plane clipped a security fence while landing at Lukla's Tenzing-Hillary airport.

Of the 19 people on board the Yeti Airlines plane, only the pilot survived the crash.

Ghimire said investigations would continue for several more days.

Three Nepalese victims have been identified and their bodies handed over to relatives. Medical and forensic experts from Nepal, Germany and Australia are meanwhile struggling to identify the remaining badly charred bodies.

The tiny Lukla airport, carved into the side of the Himalayas at an altitude of 2,800 metres, is known for its dramatic scenery and a runway that ends in a steep drop of a few hundred metres.

It is an important jumping-off point for trekkers and mountaineers heading to Mount Everest.

In 2005, 12 people survived a crash in a small plane at the airport with minor injuries.