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Analysis

Summary

The source of the fumes was probably the result of heating of chemical compounds contained in the secondary heat exchanger that was fitted to the aircraft on 18 September 2000. The compounds contained in the secondary heat exchanger apparently decomposed under high temperatures in the heat exchangers, resulting in the contamination of the cabin and flight deck air supply. The investigation was unable to positively determine the origin of those compounds but it appears that they were introduced at some stage during the overhaul of the secondary heat exchanger.

 
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