This Request for Information (RFI) is issued on behalf of the Flight Physiological Centre (FPC) in Linköping, Sweden. FMV provides advanced training in aviation physiological , including both normobaric and hypobaric hypoxia training, as well as other related training capabilities. In both of these training systems, oxygen masks and breathing regulators from the SK 60 aircraft system are currently used. The oxygen mask is used in conjunction with a flight helmet, which provides integrated earphones and attachment points for the oxygen mask. The SK 60 aircraft system is no longer in service with the Swedish Air Force. Consequently, the availability of replacement units, maintenance services, and spare parts for the current equipment is very limited.