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Printed page 82. PDF page 100.
Research Laboratory (AFRL) at Wright Patterson Air Force Base, this residue was similar to silver-sulfide deposits158 that they observed during previous examinations of fuel probes from military airplanes. The Safety Board's examination of wiring from the accident airplane reOpen final report at PDF page 100NTSB AAR-00/03: In-flight breakup, TWA flight 800
Printed page 173. PDF page 191.
in fuel tanks), and sulfur (a contaminant in jet fuel), a combination also known as silver-sulfides.349 The Safety Board became aware that the AFRL fuel specialists had conducted research on similar deposits in the late 1980s/early 1990s. According to theOpen final report at PDF page 191NTSB AAR-00/03: In-flight breakup, TWA flight 800
Printed page 174. PDF page 192.
when exposed to a 170-volt pulse. Further, the AFRL fuel specialists noted that the silver-sulfide deposits were semiconductive and, thus, gradually reduced insulation resistance between electrical connections. The AFRL report concluded that the accumulation of silver-Open final report at PDF page 192NTSB AAR-00/03: In-flight breakup, TWA flight 800
Printed page 175. PDF page 193.
in reports from Evans-East Laboratories353 and the AFRL/UDRI,354 revealed that these silver-sulfide deposits accumulate over time355 as a result of exposure to jet fuel (and jet fuel vapor), which contains sulfur.356 These deposits were typically found on FQIS wire atOpen final report at PDF page 193NTSB AAR-00/03: In-flight breakup, TWA flight 800
Printed page 176. PDF page 194.
researchers at the University of Arizona also used the method developed by UDRI to create silver-sulfide deposits in a laboratory. During subsequent tests, these deposits served as an ignition mechanism for Jet A fuel vapor. The results of these testsOpen final report at PDF page 194NTSB AAR-00/03: In-flight breakup, TWA flight 800
Printed page 213. PDF page 231.
of the accumulation of deposits composed of copper, sulfur, and silver (also known as silver-sulfide deposits) around the outer braid of some jumper wires. Tests conducted by the manufacturer showed that these deposits did not affect the bonding function ofOpen final report at PDF page 231NTSB AAR-00/03: In-flight breakup, TWA flight 800