That why he is charged with manslaughter not murder.
He allegedly entered the loop from a height he was not permitted to be at (lower than his authorised lowest level) at a speed well below what was required to commence the manoeuvre and when allegedly too low and slow at the top of the loop did not take his last chance to abort the manoeuvre by rolling out. It’s been said he was a very experienced ex RAF fast jet pilot, and current airline pilot. The following English law on one type of manslaughter may apply, the list of jobs could easily include pilot. From my reading, the more qualified and experienced you are, the more this applies to you.
Manslaughter by gross negligence
Under English law, where a person owes a duty of care (either by statute or by the neighbour principle) and is negligent to such a degree that consequently the law regards it as a crime(namely the person has been grossly negligent) and that person causes the victim to die, she may be liable for gross negligence manslaughter. The defendants in such cases are often people carrying out jobs that require special skills or care, such as doctors, teachers, police or prison officers, or electricians, who fail to meet the standard which could be expected from a reasonable person of the same profession. In R v Bateman the Court of Criminal Appeal held that gross negligence manslaughter involved the following elements:
the defendant owed a duty to the deceased to take care;
the defendant breached this duty;
the breach caused the death of the deceased; and
the defendant's negligence was gross, that is, it showed such a disregard for the life and safety of others as to amount to a crime and deserve punishment.