FED-STD-791D
Method 3450
September 30, 1986
BEARING DEPOSITION OF AVIATION TURBINE ENGINE LUBRICANTS
1. SCOPE
1.1 This method describes detailed procedures used to conduct the bearing deposition
test for evaluating deposit and degradation characteristics of aircraft turbine engine lubricants at
various severity levels of bulk-oil temperature and bearing temperature for 48 h duration.
2. SUMMARY
2.1 A sample of the lubricant is subjected to the required temperature levels for a
controlled number of hours. At periodic intervals during the test and at the end of test, samples
of the oil are examined for both physical and chemical changes when compared to the sample of
new oil. A visual inspection is made at the end of test of the accumulated deposits on the bearing
and other machine components. A weighted numerical rating system is used for rating
individual areas as well as for obtaining an overall rating. Additional data on relative sludge
forming tendencies of oils are obtained by weighing a 100-mesh filter element and a 40-mesh
filter element.
3. SAMPLE SIZE
3.1 Approximately 10 L of test oil.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 The following documents, of the issue in effect on date of invitation for bids or
request for proposal, form a part of this specification to the extent specified herein.
Military specifications:
Military Specification
Title
SAE AMS 5518
Steel, Corrosion Resistant (18-8), Plate, Sheet and Strip
(Copies of specifications, standards, handbooks, drawings, publications, and other
Government documents required by contractors in connection with specific acquisition functions
should be obtained from the contracting activity or as directed by the contracting activity.)
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