Not AvailableThis part of ISO 9022 specifies methods for the testing of Optical instruments and instruments containing Optical components, under equivalent conditions, for their ability to resist the combined influence of cold and low air pressure, including the potential condensation and freezing of water, simultaneously acting on the instrument under test. This part of ISO 9022 is applicable to Optical instruments, and instruments containing Optical components, designed for Operation and/or transport in high mountainous areas or on board aircraft or missiles. The purpose of testing is to investigate to what extent the Optical, thermal, mechanical, Chemical and electrical Performance characteristics of the specimen (e.g. of instruments installed in unheated aircraft or missiles providing no pressure balance) are affected by low temperature and low air pressure. Furthermore, the additional effects of water condensing and freezing on the instrument or components externally mounted on aircraft or missiles tan be determined.