727 cooper vanes

Date:         27 Aug 97 03:57:55 
From:         baejs3201@aol.com (BAEJS3201)
Organization: AOL http://www.aol.com
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I recently talked to a mechanic at work and the subject of the Cooper Vane
on the 727 aft airstairs came up. He said this has develop after the DP
Cooper Hijacking.

Well my question is was this a Sevice Bullatin or was this just something
that some 727 operators refitted their aircraft with. My company has two
former Korean Air 727-200's and one 727-100 and none of these have a
Cooper vane fitted on them or is this a old mechanics folk lore.