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http://www.aaib.gov.uk/cms_resources.cf ... 007-12.pdf
Report: Korean B744 over Irish Sea on Jan 17th 2012, hot cows
By Simon Hradecky, created Thursday, Jul 12th 2012 13:38Z, last updated Friday, Jul 13th 2012 08:33Z
A Korean Air Boeing 747-400, registration HL7601 performing freight flight KE-9560 from Chicago O'Hare,IL (USA) to Brussels (Belgium) with 390 cows travelling on the main deck,
was enroute at FL340 over the Irish Sea when the crew received an aft main deck fire warning.
The AAIB stated in their bulletin the crew believed "the presence of the cattle led to higher than normal levels of humidity and that this was the cause of the warning."
The bulletin did not state on the fate of the cows.
The airline reported none of the cows suffered from hypoxia during the emergency descent, all of them reached London in good condition.