scope:

This specification covers the requirements for greases resistant to hydrocarbon fuel and liquid oxygen and for use as lubricants in aircraft, aerospace vehicles, and supporting equipment (see 6.1). These greases are identified by NATO code numbers as follow (see 6.5):

TYPE NATO NUMBER I G-397 II G-398 III G-399 IV G-1350.

Use shall be of the following types, as specified (see 6.1):

Type I −54°C to 149°C ( −65°F to 300°F) operating temperature Type II −40°C to 204°C ( −40°F to 400°F) operating temperature Type III −34°C to 204°C ( −30°F to 400°F) operating temperature Type IV −73°C to 204°C (−100°F to 400°F) operating temperature Type V −73°C to 232°C (−100°F to 450°F) operating temperature.

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: ASC/ENOSD, 2335 Seventh Street, Suite 6, Wright-Patterson AFB OH 45433-7809, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

intended Use: