Most travelers ignore to watch the safety instructions given before flight, but for those who pay attention, wonder why you have to wear your mask first and then put on the others? Why do airlines dim the cabin lights during nighttime take offs and landings? What is the proper brace position in event of an emergency?
George Hobica, founder of airfarewatchdog.com, attended the British Airlines’ Flight Safety Awareness Course and the instructors there explained a whole lot of things that airlines won’t tell you. Things like ‘touchdrills’ and ‘muscle memory’ are all a part of the safety instructions that one must reason out and understand. For example:
The correct brace position is to put your hands on your head, but not in just any slipshod fashion (and definitely not with the fingers locked together). See how the illustration shows one hand over the other? Is that just arbitrary? No as it turns out. Should something fall on you during a crash landing, you want to protect at least one hand (preferably the one you write with) because you’ll need it to unbuckle your seat belt when it’s safe to do so. Your other hand is in that position to provide some protection to your “strong” hand, which will be doing the unbuckling.
Read the whole article: What Airlines Won’t Tell You During The Safety Demonstration (HuffingtonPost.com)