This specification covers the requirements for one grade of grease for use at extremely low temperatures on aircraft and instruments. This grease is effective in the temperature range from -73° to 121°C. The type I grease is identified by NATO code Number G-354 (see 6.8).Intended Use: The grease is intended for use in ball, roller and needle bearings, gears, and on sliding and rolling surfaces of such equipment as instruments, cameras, electronic gear and aircraft control systems that are subject to extreme marine and low temperature conditions not encountered in commercial aviation. It can be used for rolling and sliding surfaces of equipment having low motivating power (low torque equipment). Its extremely low volatility (see evaporation requirement in table I) is of advantage in preventing oil fogging in aircraft optical instruments. This grease is also intended for use on aircraft gears, actuator screws, and other equipment requiring a lubricant with high load carrying capacity over a temperature range of -73° to +121°C.