A report into a plane crash which killed 51 people in Nepal last year has blamed the pilot’s stress and disorientation for the disaster.

Nepalese officials who investigated the accident concluded the Bangladeshi captain Abid Sultan came in to land at Kathmandu airport at a “very dangerous and unsafe altitude” after approaching at the wrong angle.

Under stress and suffering from a lack of sleep, Mr Sultan decided to land in “sheer desperation after sighting the runway, at very close proximity and very low altitude” the report said.

After failing to land once, Mr Sultan’s US-Bangla Airlines Flight BS211 crashed at his second attempt.

Some 51 people, mostly Bangaldeshis and Nepalese, were killed and a further 20 others injured. Both Mr Sultan and his co-pilot were among those who died.

The worst airports in the world, according to pilots Show all 10 1 /10 The worst airports in the world, according to pilots The worst airports in the world, according to pilots Los Angeles (LAX), US The entrance to Los Angeles International Airport, one of the least liked in the world Rex Features The worst airports in the world, according to pilots Kathmandu (KTM), Nepal The worst airports in the world, according to pilots Paris Charles de Gaulle (CDG), France Passengers waiting for their flight at Charles de Gaulle airport in Paris The worst airports in the world, according to pilots Manila Ninoy Aquino International Airport (MNL), Philippines The worst airports in the world, according to pilots Chicago (ORD), US The worst airports in the world, according to pilots Heathrow (LHR), UK The worst airports in the world, according to pilots Pyongyang Sunan International Airport (FNJ), North Korea The worst airports in the world, according to pilots Sao Paulo-Congonhas Airport (CGH), Brazil The worst airports in the world, according to pilots La Guardia Airport (LGA), New York City, US A runway at the disliked La Guardia airport in New York City The worst airports in the world, according to pilots Madrid-Bajaras (MAD), Spain

A draft report leaked in August found the pilot had suffered an “emotional breakdown” over work-related stress.

Mr Sultan had chain-smoked and wept inside the cockpit during the flight, after he had been upset by a female colleague who had questioned his reputation.

The final report conluded he was emotionally disturbed in the lead up to the ill-fated flight.

He had been released from the Bangladesh Air Force in 1993 because he was suffering from depression and was only cleared to fly civilian aircraft in 2002 after a detailed medical evaluation.

The report also accused the air traffic controllers at Kathmandu Tribhuvan International Airport of failing to correctly monitor the plane’s flight path and issue clear instructions after Mr Sultan failed to land on his first approach.

As well as more training on assertiveness for flight controllers, the report also recommended Bangladesh’s civil aviation authority reassess the psychological wellbeing of any grounded pilots before renewing their licences.

Support free-thinking journalism and attend Independent events

The crash was the worst aviation disaster in Nepal for a quarter of a century, but also the ninth fatal accident in just eight years.

Kathmandu’s airport, surrounded by steep mountains, is considered to be one of the most challenging runways to land on in the world.