The Air Accident Investigation Branch have identified the following causal factors in the accident:
- The aircraft did not achieve sufficient height at the apex of the accident manoeuvre to complete it before impacting the ground because the combination of low entry speed and low engine thrust.
- An escape manoeuvre was not carried out.
- The pilot either did not perceive that an escape manoeuvre was necessary or it not realise that one was possible.
- The pilot had not received formal training to escape from the accident manoeuvre in a Hunter and had not had his competent to do so assessed.
- The pilot had not practised the technique for escaping from the accident manoeuvre in a hunter.
- A change of ground track during the manoeuvre positioned the aircraft further east than planned producing an exit track along the A2.
- The manoeuvre took place above an area occupied by the public which the organisers of the flying display had not control.
The 52-year-old, from Hertfordshire, was thrown from the plane during the crash and taken to hospital in a critical condition.
Bob and Caroline Schilt told ITV News it is "extraordinary" certain safety rules were not required of the organisers of the 2015 airshow.
The parents of Jacob Schilt - Caroline and Bob Schilt - say they couldn't believe that the regulations weren't stringent.