The £7million jet which crashed killing three members of Osama Bin Laden's family climbed 500 feet as it was coming into land, prompting the pilot to dive the aircraft at high speed towards the tarmac.

Flight data captured by AvGen Limited showed that as the aircraft approached the airfield it was flying at 1,250 feet, but as it turned around the circuit before landing, it increased altitude to 1,750 feet - at a critical time in the flight when it should have been losing height.

As the pilot, Mazen Al Doaja, steered the aircraft around towards the runway, he pushed the jet into a steep dive of 3,000 feet per minute.

Aviation experts are baffled as to why an experienced pilot would have continued the approach when the aircraft was not properly lined up on the runway on a stable approach.

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The pilot of the Bin Laden family jet, pictured here moments before the disaster, gained 500 feet at a time in the flight when he should have been descending and was forced to dive at a rate of 3,000 feet per minute

As the jet crossed the runway threshold, pictured, it was travelling at 149kts - some 30kts higher than normal

Moments later, the aircraft crashed into the Blackbushe Car Auction at the far end of the runway

The aircraft approached the airfield at 1,250 feet, but shot up to 1,750 as it prepared to land. The pilot was forced put the jet into a steep dive, which increased its speed leading to the disaster, killing four people

The data, which was captured using specialist flight monitoring software called ADS-B, showed that the aircraft was flying in an unusual pattern as it prepared to land.

As the aircraft passed the threshold of the runway, it was at 75 feet, which was normal, but it was still flying at 149kts - some 30kts higher than usual - as it prepared to touch down.

Dave Reid, managing director of AvGen Ltd told MailOnline: 'We monitor aircraft using Heathrow Airport, but after the accident in Blackbushe, we decided to see if we had data from the Phenom 300. The data is broadcast by commercial aircraft, executive jets and some private aircraft.'

The information broadcast include the aircraft's identity, altitude, location, speed, heading, and rate of climb or descent.

'The aircraft increased in altitude by 500 feet at a time when it should have been descending. I am sure that this is something that the AAIB will be looking at in due course.'

According the aircraft's manufacturers, Embraer, the Phenom 300 requires a minimum length of 799 metres to land at sea level and in dry conditions.

The runway at Blackbushe is 1,059 metres long, giving the pilot only 250 metres of extra space to land.

Killed: This image, which has been widely circulated online, is believed to show Sana bin Laden, the half-sister of Osama, sitting on a plane. She is thought to have died in a airplane crash in Hampshire

The aircraft tried and failed to land on the main runway at Blackbushe and instead ploughed into the car park

Forensic officers inspect the crash site today after the plane exploded in the middle of a car auction

Mr Reid added: 'As he passed the threshold of the runway, he was at 75 feet and travelling at 149kts. I am not a pilot, I am an engineer, so I can not comment on whether he was going too fast.'

A further interrogation of the data suggested the aircraft did not touch the runway, leading to speculation that the pilot, realising he was rapidly running out of runway, tried to abort his landing and 'go around'.

However, after bleeding-off a significant amount of his speed and reducing power on his engines, he did not have enough thrust to gain altitude and stalled without the altitude to recover.

Flight instructor and pilot Simon Moores, who has flown into Blackbushe many times, told The Observer : 'It doesn’t make sense to me as an ordinary pilot why something that advanced and easy to fly would bury itself in the auction ground.'

The aerodrome is equipped with Precision Approach Pathway Indicators (Papis), which warn the pilot where they are on the correct glide slope to safely land on the runway.

If the aircraft is too high, the pilot will see white flashing lights, too low and the lights turn red. Only if the aircraft is on the correct track will turn green.

Mazen Al Doaja, pictured, was flying the £7million jet when it crashed into the car auction site following the botched attempt at landing at Blackbushe Airport

Aviation sources said the aircraft was flying an 'unstabilised approach' and should have aborted the landing far earlier and 'gone around' for a second attempt.

According to one popular aviation forum, the pilot was flying 'high and fast' and did not have enough runway to stop safely.

The aircraft cleared the end of the runway, but did not have enough speed to increase altitude sufficiently.

Experts at the Air Accident Investigation Board will look for detailed flight data records contained within the aircraft's black boxes.

This data may provide a clue as to why the aircraft increased its altitude less than a minute before it was due to land. It will also show at what stage the pilot decided against continuing with the landing.

The actual crash site itself will provide vital information for air crash investigators.

Aviation sources have suggested that the pilot, seeing the end of the runway rapidly approaching, pulled back on his controls to raise the nose and gain height and open the throttles to increase power. However, jet engines take a period of time to 'spool up' and with a lack of thrust, the aircraft stalled and 'pancaked' into the adjacent car park.

The £7million jet needs 800 metres runway to land safely in normal conditions, although experts fear it was travelling too fast as it attempted to touch down on the 1,059 metre-long Blackbushe runway

Hampshire police confirmed that the dead terrorist's stepmother Rajaa Hashim, his sister, Sana bin Laden, and his brother-in-law, Zuhair Hashim, were all killed in the crash along with their pilot. .

THE EMBRAER PHENOM 300 JET It is a light jet aircraft made by Brazilian manufacturer Embraer.

Standard models of the plane can hold eight occupants, including those in the cockpit. It can be adapted to carry up to 11 people.

Its wingspan is 15.91m (52ft 2 inches), and length is 15.64m (51ft 4 inches).

The plane can reach 453 knots on high-speed cruise mode.

It can reach a maximum altitude of 45,000ft (13,716m).

The aircraft has a range of 3,650 km, approximately five hours of flight time.

Its landing distance is 799m (2,621ft) Advertisement

A police spokesman said: 'We do believe three of the deceased to be the mother, sister and brother-in-law of the owner of the aircraft, all of whom are from the Bin Laden family, but formal post-mortem examinations are ongoing.

'They were Saudi Arabian nationals and visiting the UK on vacation.'

The Saudi ambassador to the UK offered his condolences to the Bin Laden family, who own a major construction company in Saudi Arabia.

The statement said: 'His Royal Highness Prince Mohammed bin Nawaf Al Saud ... has paid his condolences to the family and relatives of Mohammed bin Laden at Blackbushe Airport in Britain for the great loss they have suffered as a result of the crash of the plane that was carrying the family.'

A further statement said the embassy would work with the British authorities to ensure a quick repatriation of the bodies for burial.

The family's pilot has now been named as Mazen Al Doaja and his family have paid tribute, saying they are in shock over his death

The plane had flown in from Malpensa Airport in Milan to the airfield.

This is the third time members of the Bin Laden family have been killed in aircraft accidents.

The terrorist mastermind's father Mohammed originally registered the tail number of the aircraft involved in yesterday's crash in the 1960s.

He was flying a Beechraft twin-engine aircraft with the number HZ-IBN, in 1967 when he crashed into the desert in Saudi Arabia.

Despite the disaster, the Bin Laden family transferred the tail number to their main private aircraft.

The second aviation fatality involving the Bin Laden family was when Osama's eldest brother Salem died after the aircraft he was piloting crashed into powerlines in San Antonio, Texas, in 1988.

In honour of Salem Bin Laden, the family named the company which handles their private jets Salem Aviation.

Osama bin Laden's eldest brother Salem, right, died in a plane crash in the United States in 1988,