MH370, which was flying from Kuala Lumpur to Beijing, China, disappeared on March 8, 2014. The Boeing 777 was carrying 239 people when it disappeared over the South China Sea. Captain Zaharie Shah last communicated with air traffic control at 1:19am during a routine handover from Malaysian to Vietnamese channels.
The experienced pilot has come under fire after analysis of radar and satellite date showed the plane suddenly changed course and flew back across Malaysia, before turning south of Penang.
Many believe this move was a final goodbye gesture to his hometown of Penang.
Among them, Larry Vance is one of the supporters of this theory.
Mr Vance’s background as a training pilot, flight test examiner, and civil aviation inspector led to a career as a professional accident investigator.
In 2018 book “MH370: Mystery Solved”, he wrote: “The investigation into the disappearance of MH370 is different because MH370 was not an accident.
“MH370 has only one cause – it was caused by an international criminal act – perpetrated by one individual.
“There is no complex sequence of failures like there would be in an accident scenario.
“MH370 can be explained by one single cause – that being the conduct of the pilot.”
In February 2019, Mr Vance admitted that he could not say for certain whether the pilot, Captain Shah or co-pilot, 1st Officer Fariq Ab Hamid, were the perpetrator.
However, he said the most likely suspect is Captain Shah, who had ordered two extra hours of fuel before the flight.
He added: “The simplicity of the disappearance of MH370 comes down to this: either it was a criminal act, or it was not.
“The evidence confirms it was a criminal act, committed by one individual who, as a pilot in the plane, had a simple means to carry it out.
“There was nothing to prevent an MH370 pilot from commandeering his own plane and then following the exact sequence of events to take the plane to the bottom of the ocean.
“That is what happened and that is a fact.”
It is not the first shock claim Mr Vance has made.
He previously detailed how he believed Mr Shah had made two mistakes during the flight which will help to eventually find the plane.
He wrote in the same book: “Fortunately, there were two shortcomings in his planning and, because of these, evidence was left behind about what happened.
“First, the pilot was unaware that he could not disable the plane’s systems in such a way as to make it completely disappear from all electronic tracking.
“Secondly, he did not anticipate that pieces of the plane would be dislodged during the controlled ditching and that the dislodged pieces would be sufficiently buoyant to float until they reached the shoreline.
“The evidence to support a deliberate act is very clear.”