MIL-STD-1518E
3. DEFINITIONS
3.1 Conductivity additive. A conductivity additive is added to aviation turbine fuels to decrease the time required to relax any electrical charge accumulated in the fuel during movement, pumping or filtration. The usual concentration of this additive is one or two parts per million (PPM). The conductivity level of the fuel on receipt at the using facility should be between 150 and 450 picosiemens per meter or conductivity units (CU). Fuel serviced to aircraft should be between 50 and 700 CU. Commercial jet fuel procured outside the U.S. is usually supplied with conductivity levels between 50 and 450 CU.
3.2 Corrosion inhibitor/lubricity improver (CI/LI). This additive, conforming to MIL-PRF-25017, is required in JP-5 and JP-8 fuel to inhibit corrosion of steel surfaces in contact with fuel. CI/LI also provides added lubricity to fuel for more effective operation of aircraft fuel components such as pumps and fuel controls. Since there are several qualified manufacturers of inhibitors, the amount blended into the fuel depends on the type used. This is governed by the Qualified Products List (QPL) for MIL-PRF-
25017 and ranges from a minimum of 3.15 pounds to a maximum of 11.03 pounds per 1000 barrels of jet fuel.
3.3 Filter differential pressure. The decrease in pressure as measured from the inlet to the outlet of a filter vessel.
3.4 Filter vessel. A cylindrical vessel housing filter elements (either coalesced/separator or absorption type) designed for removing solid contaminants and free water from fuel.
3.5 Fuel. Aviation gasoline or aviation turbine fuels.
3.6 Aviation turbine fuels.
3.6.1 JP-5 (NATO F-44). A high flash point (� 60°C) aviation turbine fuel. JP-5 is the primary fuel for naval aircraft and is used in aircraft of all services operating off of Navy ships. Procured to the requirements of MIL-DTL-5624, JP-5 contains both fuel system icing inhibitor (FSII) and CI/LI.
3.6.2 JP-8 (NATO F-34). The standard fuel for US Army and USAF turbine engine powered aircraft and for some shore based Navy aircraft. JP-8 is similar to commercial Jet A-1 with the addition of CI/LI, FSII, and conductivity additives. Procured to meet MIL-DTL-83133, JP-8 is the standard fuel for NATO use in Europe.
3.6.3 JP-8+100 (NATO F-37). JP-8 containing a thermal stability additive is JP-8+100 (NATO F-
37). The additive improves the thermal stability of JP-8 by approximately 100°F. For downgrading and/or blending procedures involving JP-8+100 contact AFPA/PTMT at (937) 255-8070, DSN 785-8070, for
guidance.
3.6.4 JET A (NATO F-24). This fuel is commercial Jet A with the addition of CI/LI, FSII, and conductivity additives. Procured to meet ASTM D1655, Jet A is the standard fuel for use in the continental United States.
3.6.5 JET A/JET A1. These are commercial aviation turbine engine fuels procured to meet
ASTM D1655, Jet A is the standard fuel for use in the continental United States.
3.6.6 Aviation Turbine Engine Fuel, Not Otherwise Specified (N.O.S.) This fuel is the result of commingling two or more aviation turbine fuel products. Commingling of JP-5, JP-8, Jet A (F-24), and Jet A/Jet A1 is generally acceptable. (Commingling of JP-8+100 is not authorized, see 3.6.3) Commingled aviation turbine fuel that meets the minimum requirements of Table III should be considered Jet A fuel
unless additional testing is accomplished. If additional testing is performed then the fuel may be
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business