Gday Folks
Currently I'm an FO on the Jetstream 32. Our company SOP's dictate that I brief the passenger seated in 7A(rear exit row) or person sitting closest to it and the passengers seated in the overwing exit row. I make a point of getting the passenger to look at the briefing card whilst i talk them through the card and the when to and when not to open the door. I have seen some FO's just say to passengers to read the briefing card before takeoff, but the reality is most pax dont bother reading it.
The backdoor is locked by rotating the handle to the locked position. this pushes 6 locking bolts into place, when the aircraft is pressurised the internal pressure pushing on the bolts make it extremely difficult to open the door in flight. If you look at the door handle when it is in the closed position you can see that it is protected by a stop. This "stop" is purely there so you can't bump into the door handle and have it open. You will also have 6 clear indicators, with 2 red lines drawn on them, when all of those lines are lined up the door is infact locked. This is an extra protection on top of the microswitches as sometimes one microswitch will give a false reading.
Now the fun part.
To open the rear door. Very Simply just grab the door handle, pull it in towards you just to clear the "stop" as you do this you will notice that directly below the handle is a clear indicator and when you pull the handle in this indicator will disappear meaning you can now open the door. Once you have pulled the handle in, simply turn it clockwise, all the locking pins will retract into the door then simply push the door open, the door may drop all the way down and lock open or it may sit on the strut in a kind of half open position, dont worry about that just put some weight on the door and it will open and remain open by use of an over centre locking mechanism which engages by itself when the door is fully open and weight is on it.
Overwing exit operation is even easier.
Looking at the overwing exit you will notice that at the top is a "pull" sign.
If the window is on your right you are best off putting your right hand on the bottom of the window and using your left hand pull the pull handle cover off which exposes a red handle, pull the red handle, pull the window in on you, turn it on its side and throw it out the hole. Conversely if the window is to the left of you put your left hand on the bottom and use your right hand to pull the handle. This will save time by not requiring you to "swap" hands to give the window a good hurl out the hole. Also just out of interest, the Right hand side Overwing exit is slightly larger than the left! Something to keep in mind if you have a large frame like myself!
Always remember do nothing until you hear the captain or the FO say "Evacuate, Evacuate, Evacuate" or whatever command the crew tells you to expect.
Hope I explained it well enough.
Percy