ISO/TR 14179-2 isn't just a dry technical report; it is the "survival guide" for gears facing high-stress, high-heat environments. Formally titled

Important Note: Because this is a Technical Report (not a full International Standard), it is less prescriptive but more explanatory. It offers calculation methods rather than pass/fail criteria, which is why engineers need the original PDF to interpret the nuances.

starts climbing—70°C, 85°C, and then hitting a dangerous ISO - International Organization for Standardization

As an ISO Technical Report, the full document is typically not available for free and must be purchased through official standards bodies: Go to product viewer dialog for this item.