MIL-PRF-83261B (USAF), PERFORMANCE SPECIFICATION GREASE, AIRCRAFT, EXTREME PRESSURE, ANTI-WEAR (13 FEB 1998) [SUPERSEDING MIL-G-83261A(USAF)]., This specification covers a grease intended to lubricate aircraft accessories which operate at high speeds and under heavy loads in a temperature range of -73°C to +232°C.