767 Service Ceiling

From:         Eric Bartsch <bartsch@uxa.cso.uiuc.edu>
Date:         01 Aug 94 23:49:36 
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  I was wondering if anyone has information on the service ceiling of
any of the 767 variants. I have managed to find information on the 
engine-out ceiling of all the various engine/airframe combinations but
was unable to find the twin engine ceiling. The best economy cruise
appears to be around 39,000 feet for most variants but I seem to recall
that the actual ceiling was significantly higher. Any information would
be appreciated.

  -Eric Bartsch