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Significant Factors


  1. Fracture of the high pressure duct allowed high-pressure, high-temperature air to impinge on the engine fire detector loop wires adjacent to the fracture, damaging their insulation and disrupting the wire loom.
  2. The continued fire warning led the crew to discharge the second fire bottle.
  3. The engine fire detection loop wires were not protected against damage by the high- pressure, high-temperature air that escaped from the fractured duct.

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