Microbial contamination poses a great threat to aviation system security through mechanisms such as microbiologically influenced corrosion (MIC), fuel filter clogging, and fuel deterioration. In this study, a survey of microbial contamination in aviation fuel obtained from aircraft fuel tanks was performed to test the relationship between microbial contamination and aircraft service life. The contaminating microorganisms were counted, isolated, identified, and subjected to preliminary characterization. A low risk of microbial contamination in the selected samples was confirmed, and there was no significant difference in the counts between culturable bacteria and fungi (p > 0.05). Phylogenetic analysis tree indicated that the diversity of culturable microorganisms was rather low, with 17 bacterial isolates belonging to 13 genera and 12 fungal isolates belonging to 5 genera. No yeast was isolated. The growth characteristics of these isolates indicated that the aircraft fuel tanks harbored various microorganisms that were able to utilize the aviation fuel as a source of carbon and energy. Meanwhile, some isolates caused emulsification and produced acid. The conclusions of this study were that various hazardous microorganisms can root in aircraft aviation fuel tanks. There was no relationship between microbial contamination and aircraft service life (p > 0.05), and continuous good maintenance suppressed microbial proliferation.

中文翻译：

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飞机燃油箱中航空燃油中微生物污染的调查。

微生物污染通过诸如微生物影响的腐蚀（MIC），燃油滤清器堵塞和燃油劣化等机制对航空系统的安全构成了巨大威胁。在这项研究中，对从飞机油箱获得的航空燃料中的微生物污染进行了调查，以测试微生物污染与飞机使用寿命之间的关系。对污染的微生物进行计数，分离，鉴定，并进行初步表征。确认所选样品中微生物污染的风险较低，并且可培养细菌和真菌之间的计数没有显着差异（p> 0.05）。系统发育分析树表明，可培养微生物的多样性较低，其中有13个属的17种细菌分离物和5个属的12种真菌分离物。没有分离出酵母。这些分离物的生长特征表明，飞机油箱中含有各种微生物，这些微生物能够利用航空燃料作为碳和能源。同时，一些分离物引起乳化并产生酸。这项研究的结论是，各种有害微生物可以在飞机航空燃油箱中生根。微生物污染与飞机使用寿命之间没有关系（p> 0.05），持续的良好维护可以抑制微生物的扩散。这些分离物的生长特征表明，飞机油箱中含有各种微生物，这些微生物能够利用航空燃料作为碳和能源。同时，一些分离物引起乳化并产生酸。这项研究的结论是，各种有害微生物可以在飞机航空燃油箱中生根。微生物污染与飞机使用寿命之间没有关系（p> 0.05），持续的良好维护可以抑制微生物的扩散。这些分离物的生长特征表明，飞机油箱中含有各种微生物，这些微生物能够利用航空燃料作为碳和能源。同时，一些分离物引起乳化并产生酸。这项研究的结论是，各种有害微生物可以在飞机航空燃油箱中生根。微生物污染与飞机使用寿命之间没有关系（p> 0.05），持续的良好维护可以抑制微生物的扩散。