ZSh-7AS is a modification of the ZSh-7A helmet. According to ZSh-7 manual, ZSH-7APS differs from the -AP version by having special communication package called "Variant-1M" which should be used with "Mahovik" and "Preriya" radio stations. Manual also mentions that this type of helmet is to be used with either KM-35MS or KM-35DS and KM-34DS oxygen masks. Externally, ZSh-7AS differs from ZSh-7A by having different plugs for microphone and in to aircraft communication system.   ZSh-7AS helmet - front view. Right side of the helmet. Back view... Left view. This and above pictures clearly show that ZSh-7AS is similar to ZSh-7A in appereance. Visor down... Several ID tags are located inside of the helmet, they are rather similar to ID tags found on other ZSh-7 helmets. Shown here is one that shows helmet's model, size and serial number. Close up on the microphone connector. Note that unlike regular connectors, this one has 3-pin connection. To this date the only microphones with 3-pin connectors I've seen are on KM-35M and KM-35MS oxygen masks. ZSh-7AS helmets have a completely new plug for aircraft's communication system not found on older Russian planes. I don't know if it's a new standard or such connectors are only used on some special aircraft. Pin arrangement of the new plug. This and following pictures show ZSh-7AS with KM-35MS oxygen mask.