Nepali people take part in a candlelight vigil in honour of the plane crash victims in Kathmandu on March 13, 2018, a day after the deadly crash of a US-Bangla Airlines plane. AFP PHOTO.

KATHMANDU: Recordings show apparent confusion between the pilot and air traffic control over the runway approach moments before a plane crash-landed at Kathmandu airport, experts said Tuesday as Nepal began investigating its deadliest aviation accident in decades.

Aviation authorities said they had recovered the flight data recorder from the charred wreckage of the plane, which burst into flames after ploughing into a football field near Kathmandu airport on Monday killing 49 people.

Witnesses have described how the US-Bangla Airways plane carrying 71 people abruptly changed direction moments before it crashed.

On Monday the airline's chief executive Imran Asif said there had been a "fumble from the control tower" as the plane approached the airport's single runway.

An airplane takes off at the international airport in Kathmandu on March 13, 2018, near the wreckage of a US-Bangla Airlines plane. AFP PHOTO.

But airport manager Raj Kumar Chhetri told AFP it was too early to say what had caused the mountainous country's deadliest crash since 1992.

"It is yet to be identified whether the pilot or air traffic control was wrong," he said, adding the investigation would be carried out with Bangladesh.

Recordings of the conversation between air traffic control and the pilot appear to indicate confusion over which end of Kathmandu airport's runway the plane was to approach.

Air traffic control can initially be heard clearing the plane to land from the southern approach.

"You are going towards runway 20," the controller is heard saying seconds later, referring to the northern end of the tarmac.

A series of confused messages follow just before the crash in which the pilot says they will land at "runway 20" and then "runway 02" – the southern end.

"There is certainly considerable confusion from air traffic as to which runway the aircraft actually wants to land on," said Britain-based aviation expert Andrew Blackie, who has reviewed the recordings.

Survivors told AFP the pilot gave no warning to passengers as the plane abruptly changed direction just before the crash.

"I had asked the air hostess, what is happening, is everything fine? She gave a thumbs up, but I could see she was panicking," said Ashish Ranjit, 35, who escaped through a window on the plane's right.

"It was so low and it took such sharp turns."

The plane hit the runway and skidded through an airport fence, leaving a trail of fuel and coming to a stop in a field where it burst into flames.

Twenty-two passengers -- mostly sitting on the plane's right side -- managed to free themselves from burning wreckage by climbing through the plane's windows or were pulled from the fuselage by passengers and rescuers.

Kathmandu airport lies in a narrow bowl-shaped valley with the Himalayas to the north, making it a notoriously challenging place to land.

A family member of a victim mourns at the hospital, a day after the US-Bangla airplane crashed while arriving from Dhaka, in Kathmandu, Nepal March 13, 2018. REUTERS PHOTO.

Kathmandu's skies have also become increasingly crowded in recent years as air travel has boomed, but investment in critical infrastructure has lagged.

The head of Nepal's civil aviation authority rejected suggestions that the airport's creaking facilities played a role in the crash.

"The accident has not occurred because of the airport's infrastructure... Indeed it is operating in a situation of congestion, but we have procedures to safely land flights despite traffic," Sanjiv Gautam told reporters.

Nepal has a poor road network and internal flights are key to accessing its remote regions.

The country has suffered more than 20 aviation accidents in the last decade, mostly involving small planes on domestic routes.

"There are reasons why Nepal has such a relatively high accident rate, many of those are because of the challenges of operating in mountain airfields that surround Nepal," said Blackie, who was part of an team that probed a 2016 crash of a small turboprop plane in Nepal.

But experts say the Canadian-made Bombardier Dash 8 Q400 is a manoeuvrable plane that was developed to fly in Canada's harsh arctic north and should be at home in Nepal's mountainous terrain.

Bombardier is sending two members of its air safety team to support the air crash investigation. The pair left Canada Tuesday morning, the company said.

Relatives of the Bangladeshi crash victims arrived in Kathmandu on a special charter flight Tuesday. There were tearful scenes outside the morgue where most of the dead have been taken.—AFP

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