MlL-STD-1518E
classified as that grade of fuel for which all specifications are met. Use of commingled fuel in U.S. Government aircraft will be approved by the appropriate Government representative.
3.7 Fuel system icing inhibitor (FSll). FSll conforming to MlL-DTL-85470 (diethylene glycol monomethyl ether - DlEGME) is added to aviation turbine fuel to lower the freezing point of free water in the fuel/system. This precludes the formation of ice in the fuel, which can clog filter elements and result in engine fuel starvation. The inhibitor also exhibits biocidal properties restricting bacterial growth in fuel systems. Water removes FSll from fuel, therefore, the introduction of water into a fuel system must be avoided and free water must be removed at any point in the system where it accumulates. A drop in the FSll content of fuel is a definite indication of the presence of water in a system and requires immediate investigation and corrective action. lt should be noted that FSll does not affect the freezing point of the
fuel itself but only the freezing point of free water in the fuel.
3.8 Gauge pressure. Fuel pressure measured by a pressure measurement device containing a scale calibrated in pressure units, such as kilo pascals (kPa) or pounds per square inch (psi).
3.9 Hydrant servicing units. Hydrant hose trucks or hose carts, equipped with filtration, used in conjunction with hydrant systems to service aircraft.
3.10 lntragovernmental transfer. Transfer of fuel from a government-owned location to another government-owned location.
4. GENERAL REQUlREMENTS
4.1 Safety summary. General safety precautions and instructions ensure personal safety and health and the protection of Air Force property.
follows:
4.2 Product quality. Acceptable quality of fuels delivered to U.S. government aircraft shall be as
a. Receipt, storage, and issue of aviation products shall comply with ATA Specification 103 or lATA Joint lnto-plane Guidelines (JlG 1) respectfully, except as noted herein.
b. The fuel shall conform to the applicable product specification. The exception is when product is reclaimed and identified as Aviation Turbine Engine Fuel, N.O.S. referenced in paragraph 3.6.6.
c. Fuel delivered to aircraft will pass particulate matter assessment. Determination shall be
made by the Color and particle assessment method (ASTM D2276 Appendix 3). The failure criteria when comparing the membrane filter to the Color Standards are as follows: Color -- 5 or greater; Particle Assessment - if there are visual particles present the sample fails. Retake the sample using a matched- weight monitor or take a one-gallon sample for bottle method analysis (ASTM D5452). Test limits on retake samples are addressed in TABLE ll.
d. There shall be no evidence of free water when the fuel is examined visually. Aircraft shall not be serviced with jet fuel containing more than10 PPM of water as determined by the Gammon Aqua Glow or Aeronautical Engine Laboratory (AEL) free water methods or equivalent.
e. When the fuel specification requires FSll, fuel serviced to the aircraft shall be within the "USE" limits identified in Table ll.
f. When conductivity additive is required, the conductivity level serviced shall be between 50 and
700 CU.
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