FED-STD-791D
Method 3403.2
September 30, 1986
COMPATIBILITY OF TURBINE LUBRICATING OILS
1. SCOPE
1.1 This method is used for determining the compatibility of aircraft turbine lubricants
with specific referee lubricants.
2. SUMMARY
2.1 This method consists essentially of preparing mixtures of the sample lubricant and
referee lubricant in three concentrations, maintaining the mixtures at a fixed temperature for 7
days, and then centrifuging them for ten-minute intervals until the volumes of sediment becomes
constant.
3. SAMPLE SIZE
3.1 Approximately 300 mL of the aircraft turbine lubricant to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Oven, gravity-convection, 105 1C (221 2F) (to accommodate three 250-mL
flasks).
4.2 Erlenmeyer flasks, (3), Pyrex, 250-mL with glass stoppers.
4.3 Centrifuge tubes, cone-shaped, 100 mL (see ASTM D 2273).
4.4 Centrifuge, capable of spinning two or more centrifuge tubes, and applying a relative
centrifugal force of 600 to 700 at the tips of the tubes.
4.5 Bath, hot water, 93 3C (200 5F) (for simultaneous heating of centrifuge
tubes to be spun).
5. MATERIALS
5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
materials references and standards listed in this section must be handled carefully. Federal Test
Method 10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability, handling and
storage precautions, emergency treatment and measures, and spill practices of each chemical are
explained.
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