MIL-PRF-7808 describes the composition, performance, and compatibility requirements for aircraft turbine engine lubricating oil, intended for use in specific models of helicopter transmissions, aircraft turbine engines, accessory and auxiliary power units, and other types of equipment.

MIL-PRF-7808 covers two grades of synthetic base oil:
  • Grade 3: Suitable for most applications
  • Grade 4: Suitable for applications that call for higher viscosity or greater thermal stability.
While the spec was written for original lubricating oils, reblend and rebrand lubricating oils may also be approved via a process described in section 6.3 of the spec.

MIL-PRF-7808 details the requirements for a comprehensive list of performance attributes other parameters for aircraft turbine engine lubricating oils, including:
  • Particulate contamination
  • Viscosity at multiple temperatures
  • Flash point
  • Evaporation loss
  • Static and dynamic foaming
  • Deposition
  • Lead, silver, and bronze corrosion
  • Thermal stability
  • Shear stability
  • Storage stability
  • Trace amounts of ten different metals
  • Load carrying capacity
The specification lists the ASTM or FED-STD documents where methods for each test can be found. For test methods that require the use of ozone-depleting chemicals, the spec provides acceptable substitutes. 

MIL-PRF-7808 is a valuable test standard for qualifying the properties of aircraft turbine engine lubrication oils for a wide range of applications. This standard ensures the safety and efficiency of military operations by predicting and verifying the performance of critical materials in real-world conditions, which translates to reliable operations in the field and more successful missions.
 
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