KM-35 / KM-35M (Zsh-5, 7, 90) Further development of the KM-34D series 2 mask. This pressure-demand type mask is likely used only in certain Su-27 and MiG-29 (or newer) fighters and is not interchangeable with older versions of oxygen masks; it is typically used only with type ZSh-7 helmets, though it may be attached to and used with the the older Zsh-5 helmet. The primary difference between the earlier KM-34Ds2 mask and the KM-35 series is that the positive pressure exhalation valve merges directly into the main oxygen supply hose on the KM-35 about half-way down its nylon cover (on the quite similar KM-34Ds2 mask, this valve is fed by a separate oxygen hose of smaller diameter that runs parallel to the main hose for its full length). The original KM-35 prototype featured a distal front facepiece hose exit (no right-side hose attachment), one example of which is shown in the Wise & Breuninger book, ‘Jet Age Flight Helmets’; the final production models featured a side-hose exit. The mic connector found on KM-34Ds2 masks and KM-35 masks may have either a two-pin or a three-pin microphone-to-helmet connection (KM-35Ds2 masks typically use a two-pin connector). Both the KM-34Ds2 masks and the KM-35 masks have identically sized rubber boots over their exhalation valves, although due to the angle of some photographs it may appear as if there is a slight difference between the two types. The KM-35 mask may have either sage-green, gray, or black nylon fabric loosely sheathing its main oxygen delivery hose (late models tend to the black color) and the face-pieces may be molded in a range of gray polymeric colors (from light to dark). [Note: The Chinese version of the Russian KM-35M mask is designated the YM-9925 mask and it is readily identified by its overall jade-green facepiece and hose assembly.]
KM-35-I-8 (ShL type helmets) Experimental version of KM-35 mask with old style hooks for attachment to leather helmets and typically flown in rotary-wing or slow-movers. Small mini-regulator attached to front of polymeric KM-35 style face-piece, with woven fabric-covered, small diameter high-pressure hose attaching to aircraft oxygen supply. Rare.
KM-35MS (ZSh-5, 7, 90) A variant version of the KM-35M oxygen mask, designated KM-35MS is used with ZSh-7AN helmet (Navy). The Russian Naval Air Forces version of the KM-35 mask, readily identifiable by its bright orange high-visibility oxygen hose nylon fabric cover and flown on some carrier-based Russian Naval aircraft. Uses a lower impedance microphone than Russian Air Force versions (with gray-green color nylon fabric hose covers). Further information unavailable at this time, but some specimens have emerged (esp. on eBay) in recent years.
KM-35i NBC (Compatible ZSh-5,7,& 9) Very similar in intent and general configuration to predecessor, KM-32 NBC mask, except that hose exits distal facepiece and not from side, as on KM-34Ds2 and KM-35 and KM-35M masks. Uses same polymeric lower frontal mask shell as that found on the KM-35 prototype mask (Alan Wise’s Jet Age Flight Helmets)
KM-35AN (NA) No information available on this mask at present, but it appears to be a modified KM-34Ds2 mask with a special exhalation pressure hose assembly. Perhaps a prototype for the KM-35M system or perhaps a special purpose application mask (see picture in images section).
