BOAC
F4 - excuse a correction? "it will happen but you do not let it affect you.". This I think is the key - that so many have either forgotten or never learned.
We are ALWAYS subject to disorientation - it is how we cope with it that matters. You cannot stop the illusion - it is built into our bodies - and it is often a good idea to 'recognise' it.
Accepted, basically it was meant in exactly the same way, but written out of personal expierience as a military pilot.
Chances to encounter SI had been on every flight in a fast moving jet. We had to do a flight physiological course every three years, which included a big block concerning spatial disorientation and methods to avoid being affected by it. Due to the permanent exposure and training i think , that the recognition process is somewhat automatic or subconscious. Hence my statement.
franzl