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Curtis Krouse,
     I am not sure what the exact definition of "service ceiling" is.  I
think it is something like "the altitude at which your rate of climb at full
power is reduced to xxx feet per second"  but I don't know what the numbers
are.  Anyway, I have flown my L320 with a O320-D1F engine to 17,999 feet
(VFR) and she was still climbing at a very slow rate.  I hope this helps.
Bob Jude
N65BJ