This SAE Aerospace Information Report (AIR) is limited to the subject of compatibility of wiring as part of aircraft Electrical Wiring and Interconnect Systems (EWIS)installed in and around fuel tanks. Purpose This AIR examines the requirements of AS50881@ FAA requirements@ and related guidelines in regard to installation of aircraft EWIS in and around aircraft fuel tanks. EWIS wiring should not be routed through fuel tanks except where there is no alternative. In addition@ EWIS component fluid resistance requirements and results from EWIS fuel compatibility testing conducted by the U.S. DoD will be presented and discussed.