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The U.S. Navy’s concerns about the thermal stability of aviation fuel stem from a combination of increased performance requirements of engines and potential degradation in fuel quality. The results of recent atomizer fouling tests with hot fuel are presented. These are combined with similar results from Air Force programs and analyzed with respect to the impact on engine performance and reliability.

I114011ognt hea Cmnitmlin01,1J ffc) IS. SCCURITY CLASS (of hid. rOpMe Unclassified .2154 09C&ASIICATION/OOWNORAOING Approved for Public Release; Distribution Unlimited 17. 01ISTRIBUT ION ST ATEMENT (of I%. abodtenteref i tmlbSooh 20.f AII oo how kmPp, *-temperatures without forming excessive harmful coke deposits Vas investigated. This study consisted of an engineering evaluation of the lubricant deposition-degradation characteristics which could have a s .ignificant bearing on the maintainability and reliability of future high thrust to weight ratio engines to be incorporated into the Navy *inventory. Relationships were then established between these characteristics DD , ANIT 1473 ED0ITION 'Or' I O 6 ' OUL UNCLAW37=I 5/ft ~ ~ ~ ~ "UPT CLAM01 q66011 I-P^ guryc.ISIA-m ! i UNCLASSIFIED ,. u.ITY CLASSIFICATION OF THIS PAGE(When DI|me•rials, altd)esser dge and chemical composition of the " asestock materials, and to a lesser degree, the oxidation inhibiting packages. The intention of this investigation was to provide cause and effect relationships for the phenomena which were either the strengths or weakneses of the current formulation philosophies. Such an understanding ild open the way to meet the more demanding future requirements.

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