Sorry Chewie but we've been down this road before. You are a steward who's studied for a CPL, you have 50 hours flying, you have previously claimed extensive knowledge here and in other forums based entirely on sitting on the flight deck jumpseat and talking to flight crew at work. You do not hold a CPL, you have never completed a type rating course on an airliner, you do not hold an aircraft engineers or an air traffic controllers licence, ergo you do not have specialist technical knowledge in these areas. It is not an assumption, its a fact, and its this sort of inane sidetracking that a specialist forum would prevent.