The GJB 150.6-1986 standard defines the temperature-altitude test methods for military equipment in high temperature, low temperature and low pressure environments to evaluate the adaptability of equipment under these extreme environment conditions. The standard is designed to confirm the performance Stability and Reliability of equipment under various temperature and altitude changes. The current version is GJB 150.6a-2009, and an updated version is recommended to ensure that the test method meets the latest requirements.