Certain techniques involved in determining the dirt or abrasive content of aircraft greases are considered inadequate. It is desirable to develop a method of analysis which will definitely identify the quantity, size, and degree of abrasiveness of foreign substances in lubricating greases.
The objective of this work was to develop a relatively simple screening or bench test, or a combination of such tests, which would evaluate aircraft greases in respect to corrosion protection under the operating conditions described above.
This standard provides the following: a. definition of terms pertaining to marking; b. symbols for marking location; c requirements and restrictions for permanent markings; d. types of marking methods; e. rules for designating marking methods; and f. table listing marking methods. To define and control marking methods, and to provide a method for specifying desired marking methods on aerospace engineering drawings of parts and assemblies.