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Corrosion! They had the knowledge and technology to zinc chromate all internal surfaces...but out of gross negligence and profit motive the airframes insides are bare metal...a crime against aviation in my opinion.
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It's not bare metal. Zinc chromate doesn't prevent corrosion; and in some cases, it makes inspection more difficult. Corrosion takes many forms. So does corrosion prevention. A manufacturer isn't negligent because the manufacturer doesn't spray chromate on surfaces.