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DEF STAN 68-251 Revision I3, March 30, 2007
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Fuel Soluble Lubricity Improving Additives for Aviation Turbine Fuels, NATO Code: S-1747 Joint Service Designation: AL-61
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This Standard specifies the requirements for certain fuel soluble lubricity improving additives for use in aviation turbine fuels. Material provided to this standard shall possess satisfactory performance and properties when used in appropriate vehicles and/or gas turbines or engines operated by the Ministry of Defence, or for which the Civil Aviation Authority is the certificating agency.

This Standard and its related Qualified Products List (QPL) 68-251 implement the inspection requirements of NATO STANAG 3390.