Airlines in a Crisis

 What on the overwing exits stop them physically from being opened by a passenger with poor survival instincts during flight and did Boeing design engineers remove this safety mechanism from instructions for when installing a plug instead of a door. What other safety features did they omit on the grounds of cost saving in the design for using a door plug instead of a real emergency exit.  Normal cabin doors can't be opened during flight by design since they swing forward into the wind. There are few comments around on how this door (when installed) pivots. Is it up like the overwing exits or is it down since with such a small door there are probably no self inflating slide like the normal cabin doors. Or is it left or right. On the 737-200 the emergency exit overwing door came out loose and into the cabin. On the 737-NG-800 they swing up and out of the way. I doubt it just is pushed out and fall down because that could damage it during testing / maintenance. Would the overwing...

Further investigation points to that Spirit the maker of the 737 airframes do ship it with this blank in place but only temporarily fastened. Boeing then take the blank out to load the interior and then reinstall it.  The blank is like a door with a larger window and no manual opening mechnism and is being held in place by a frame rail with lugs but instead of movable pins and a handle like a normal door it is held in place with bolts and castelated nuts that should have split pins in them. As long as they are in place the doorblank can not be moved upwards (some say downwards and some later pictures of a locking bolt seems to support this) to a position where it can be opened / taken out. Again, regular inspection of these bolts have been made inpossible by having a complete panel on the inside. Questions remains over if split pins where installed. Bolted on parts can have the nuts unwinding themselves due to vibration. And the exact torque required to prevent this can be difficul...