REVIEW of military aeronautical grease requirements is brought up to date and methods of application of greases in service and specification test methods are summarized. Performance of greases in various types of equipment is discussed in the light of military requirements. Limitations of materials and test methods, alike, are indicated, with probable trends for future work.
It is shown that method of application may influence selection of and specifications for greases. Performance of currently used greases is generally satisfactory. However, increase in severity of military requirements will call for improved products in many cases. Increased emphasis on performance tests in specification writing is noted, and writing of specifications to satisfy a set of performance requirements rather than to duplicate a known satisfactory material is reported.