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1. An air box fire on a turbocharged, two-stroke cycle main propulsion engine as fitted on your general purpose supply vessel can cause the destruction of a turbocharger due to overheat and overspeed. Upon inspection, besides blistering of paint on handhole covers, what is distinctive evidence that an air box fire had occurred?
White ash residue indicates complete combustion of oil and deposits, confirming a prior air box fire. This contrasts with the presence of oil, sludge, or soot, which suggest incomplete combustion or fouling, not a fire.
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