Properly? OK agreed in that he is not always proper. But.....
We are all aware that Maurice on this and past trips is an adventurer who is testing the boundaries of what a 72 year old but very experienced pilot can do ‘unsupported’ in an even older very primitive WW2 aeroplane flying long distances through the more remote and dangerous places in the world.
It is not the normal way of doing things. We all know the expression when true life adventures or stunts get onto film. Someone has to do it. We like to watch. We can learn from it. But "do not try this at home".