Hydrocarbon-utilizing microorganisms have confronted the oil technologist with a variety of problems. In the past decade microbial growths in jet aircraft fuel systems have been of particular concern to the aviation industry.

Fuel system environments and aircraft operational conditions conducive to the proliferation of bacterial and fungal growths on the interior surfaces of the aircraft's integral wing tanks are discussed. The application of the MIL-1-27686 fuel additive as a means of inhibiting microbial growths is reviewed. Data from laboratory studies and flight testing are presented which attest to the efficacy of the additive in providing continual protection against growths accumulations detrimental to fuel tank coatings and sealants. Laboratory data include those pertaining to the additive's partitioning coefficient between the fuel and the minute water droplets which form in flight, and the establishment of minimum effective fuel treatment concentrations necessary to provide biocidal concentrations in the water phase. Data are also included which indicate the additive's ability to kill existent growths and the degree of growths inhibition realized under conditions of cycling the additive concentration in the fuel tank water bottoms above and below minimum biocidal levels. Flight test results are presented in support of laboratory findings.

Laboratory data, flight test results and general aviation experience as well as that of the military developed over several years support the conclusion that the MIL-I-27686 additive provides an effective means of inhibiting microbial growths in jet fuel systems.

Rsum Les microorganismes utilisant les hydrocarbures ont confront les techniciens du ptrole avec une diversit de problmes. Durant les dix dernires anes les croissances bactriennes dans les rservoirs des avions raction ont donn des problmes l'industrie arienne.

Le milien o voluent les combustibles et les conditions d'oprations qui contribuent la prolifration des bactries et des champignons sur la surface intrieure des rservoirs des ailes des avions sont discuts. L'application de l'additif pour combustible, MIL-I-27686 comme inhibiteur de la croissance microbienne est repasse. Les donnes des tudes de laboratoire et d'essais en vol sont prsentes et attestent de l'efficacit de l'additif qui protge continuellement contre les croissances et accumulations qui endommagent les revtements et les joints tanches des rservoirs de combustible. Les donnes de laboratoire prsentent le coefficient de sparation de l'additif entre le combustible et les minuscules gouttelettes d'eau qui se forment en cours de vol, et l'tablissement de concentrations minimum effectives, dans la phase aqueuse, ncessairs la dsinfection du combustible. Les donnes montrent aussi la capacit de l'additif d'liminer les croi

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