This part of GB/T 7631 specifies the detailed classification of Group T (turbine) products of Class L. This part should be understood in conjunction with GB/T 7631.1. This section does not include aviation turbine products. However, some land-based power stations may use aviation turbines. The selection of lubricants for such turbines is recommended according to the manufacturer's recommendation. Use TGA, TGB, TGCH, TGCE or more special aviation turbine lubricants according to the application. This section also does not include wind turbine lubricants. Gear lubricants used in wind turbines are specified in GB/T 7631.7 and ISO 12925-1.