strange door and window layout

[Volume]

Just found this picture (http://www.planepictures.net/netshow.php?id=211093) of a 707 (which crashed yesterday) in another thread.

The third emergency exit door seems to extend below the passenger deck floor if you compare it with L1 door, but it does not extend above the window belt. What is such a door for? It does not make sense to have an additional service door which can only be used by gnomes. And why should one install and additional emergency exit? You cant put more than 6 persons in a seat row in the 707 and even operators with realy small seat pitch do not have this door.

Additionally there seems to be a passenger window of double size close to the rear door. Is this a problem of the picture or does such window really exist ?

[bear11]

I've no idea if it's relevant, but if it's Saha Air, these 707s were used as militiary tankers by the Iranian Air Force before they were used for pax?

[Erebus]

The exit is known as a "Station 990" exit, being some 990 inches aft of the centre-of-gravity datum. It was only used when the 707 was in a mixed cargo/pax configuration, and you had up to 7 pallets forward and passengers aft. That required four primary cabin crew, one for each of the normal rear doors, and one for each of the station 990 exits. There was an escape slide fitted at each of the Station 990 exits when the aircraft configuration required. It had to be pulled aft from under the nearest passenger seat, then pushed out manually.
Can't help you with the apparently enlarged window, sorry.

[MReyn24050]

Volume
If you go to the same website from which your photgraph was located and view picture 1072251355 which is picture of the same aircraft. Another double window is installed in a similar location at the rear on the starboard side.