The United States Army conducted a survey of over 1200 fuel samples with the objective of evaluating the proposed limits for use by automatic light obscuration particle counters for the monitoring of aviation fuel cleanliness. The laboratory data collected supports the proposed ISO code limit, based on ISO 4406, of 19/17/14/13 limits for the 4 μm(c)/ 6um (c)/ 14μm (c)/ 30μm (c) size channels. The proposed limits were derived from 1.0 mg/L concentration levels for ISO 12103-1 AlUltrafine and ISO 12103-1 A2 Fine test dusts, and down to a 5 ppm free water contamination. Based on this work the Department of Defense Tri-Service Petroleum, Oil and Lubricants Technical Steering Committee has recommended these limits for inclusion into Table I of MIL-STD-3004.
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