KM-36 oxygen masks are the latest generation of Russian oxygen mask design. On MAKS 2005 airshow in Moscow, Zvezda had a display setup showing their latest KM-36M oxygen mask which was said to be ready to be mass produced as soon as they have orders for them (I would guess it is part of their standard equipment on newest generation of Sukhoi aircraft).

The mask shown here however bears little resemblence to the one shown on MAKS 2005 - in fact it looks as a completely different design. I have been puzzled by what it is for, until I remembered an old picture on page 1 of "In Action" section on this very site. It shows Russian setup with mannequin wearing exactly the same mask. Mannequin is dressed in VKK-15K high altitude suit (version of VKK-15 suit for fighter pilots which includes not only bladders for high altitude compensation, but also anti-g bladded), ZSh-9 (ZSh-90) helmet and this KM-36 oxygen mask. I'm not sure where and when the picture was taken, but it most likely shows first KM-36 design that was later changed in favor of more conventional, KM-34D series 2 like, design.

 

Overview of the KM-36 oxygen mask. A number of different things catch the eye right away, but I will start by saying that mask's outer shell is... metal.
Right in the middle of the mask, over the pressure valve's cover is an interesting mask adjustment system. It is made out of two metal pieces that are connected to adjustment straps and can be pulled up or down. Here they are in down position...
... and here they are in upper position. You would first need to pull up outer longer piece, and only then a smaller one.
Here is a close up view on the adjustment system. There are small hooks that connect with longer metal piece when in down position.
View from the bottom. In the middle of the metal shell is a round opening for microphone wiring. Right above that is a rubber cover for the overpressure valve, you can see its upper part through the openings in the cover. Note how overpressure valve is connected with the main oxygen hose - unlike KM-35 masks where there was a small separate hose attached directly to the hose, on KM-36 masks it was replaced with a much rigid and smaller extension tube that right into plastic tube that connects main oxygen hose with the mask.
Here is a view from a side on plastic connection piece that connect oxygen hose with mask's body. I'm not sure what was the idea behind such a radical design and I guess it was not very successful since it was phased out on later KM-36M masks. It's not very clear on this picture, but the whole thing is hold in place in 3 places - on the bottom it's connected to oxygen hose, then it's main connection to the mask in the area where it enters it and finally it is connected to the left mask adjustment strap with a small strap.
Oxygen hose bayonet. Interesting design that could not be seen on earlier Russian masks. On MAKS 2005 this area of the mask was covered (tucked into the suit), so there is no way to say if KM-36M has the same bayonet or they roller back to what we've seen on previous masks.
This is a pictures of mask's adjustment bayonet that connects it to the helmet. Apparantly this is what being used on ZSh-9 (ZSh-90) helmet. This is yet another unique feature of this mask, later KM-36M masks have regular bayonets that we've seen since introduction of KM-34 mask.
View from the other side. Small black tabs located around circle body can be squeezed - this pull backs in small grips located inside of the bayonet, it seems like ZSh-9 (ZSh-90) connectors are small round rods with cut outs to allow bayonet to hold mask in place.
View inside of the mask. Note rubber piece does not have an obturator that makes it easier for pilots to wear oxygen masks. Small round metal knob near the top of the mask is a new design of the microphone (some of the newer KM-35 masks had a somewhat similar microphone). Microphone's wire enters from below and then runs along the mask's body to the microhone. Below it, is a pressure valve. Unfortunately it's missing it's inner part and is not in working condition. Sizewise, it's bigger then older pressure valve designs.
Finally an orange ID tag located inside of the mask. It's says KM-36 on top, followed by it's serial number (this is most likely to be the second KM-36 oxygen mask produced) and finally masks size.