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Hmmm... Single engine service ceiling is 18 to 20K, can't remember exactly where. But I have never operated on one engine up there myself. Question: Did you have full power, full RPM on the engine that was operating? Was the other engine feathered? If yes, I am suprised, and suggest further investigation, beginning with me taking my airplane to 12,000 and reducing power on the front engine to simulated idle thrust, which would be about 1900 RPM.
I will also post an inquiry on our site, see what other folks experience is.
BTW, I am fairly certain that the aircraft will be unable to maintain pressurization on one engine at 18,000, but it should be able to maintain altitude, at least I thought it would...
Kevin
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