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Printed page 200. PDF page 212.
electrical potential. Attempts were made to determine whether the SR 111 electrical wire arcing events were the result of a pre-existing fire or whether the arcing had provided the energy necessary to ignite nearby flammable material. 1.19.4.1 Auger Electron SpectroscoOpen final report at PDF page 212TSB A98H0003: In-flight fire leading to collision with water
Printed page 237. PDF page 249.
insulation being preferentially melted through at this location, causing multiple wire-to-wire arcing events. These events would likely trip the associated CBs and sever the wires at some arc locations, opening the electrical circuit and de-energizing these power cables. 2.1Open final report at PDF page 249TSB A98H0003: In-flight fire leading to collision with water
Printed page 248. PDF page 260.
heat-damage patterns. Within the localized area where the fire most likely started, a wire arcing event is the only plausible ignition source. There were several wire bundles containing hundreds of wires, including the four IFEN PSU cables and 16 AmericanOpen final report at PDF page 260TSB A98H0003: In-flight fire leading to collision with water
Printed page 253. PDF page 265.
those in general aircraft use, and were not capable of protecting against all types of wire arcing events. The fire most likely started from a wire arcing event. TRANSPORTATION SAFETY BOARD 253Open final report at PDF page 265TSB A98H0003: In-flight fire leading to collision with water
Printed page 82. PDF page 94.
FACTUAL INFORMATION All of the recovered wires were examined, primarily to identify any with signs of melted copper. As the fire did not reach temperatures high enough to melt copper,50 any areas of melted copper would indicatOpen final report at PDF page 94TSB A98H0003: In-flight fire leading to collision with water
Printed page 83. PDF page 95.
without physical contact is very difficult to obtain or sustain. However, in areas where wire insulation is destroyed in a fire environment there is an increased likelihood that such an arc can be initiated and sustained, and that the conductorOpen final report at PDF page 95TSB A98H0003: In-flight fire leading to collision with water