Re: 767 Service Ceiling

From:         jfc@ATHENA.MIT.EDU (John F Carr)
Organization: Massachusetts Institute of Technology
Date:         21 Aug 94 15:35:10 
References:   1 2 3
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In article <airliners.1994.1514@ohare.Chicago.COM>,
Eric Hoffman <> wrote:

>Related point: are you legally allowed to fly (or plan to fly) a 
>commercial airliner above its service ceiling? I tend to believe that 
>you are suppose to keep some maneuvrability margin in the vertical plane
>(same stuff as more the 1.2 g margin). But that's a guess.

I think there is an altitude limit but it isn't necessarily determined
by rate of climb; the limit might be set where the manufacturer stopped
testing during type certification. 

I heard this in a conversation about the Lear Jet; there was one model
that had a high service ceiling (49000'?) and that wasn't even the real
ceiling, that was just what they chose to demonstrate to the FAA and get
approval for.

    John Carr (