Re: airplane structural terms

Date:         11 Mar 99 03:54:18 
Organization: IBM Global Services - Remote Access Mail & News Services
References:   1
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        STA numbers are measured in inches from an imaginary reference line
called the datum line. This line can be anywhere on the aircraft and is
often actually somewhere in front of the aircraft( reason being to make
weight an ballance calculations easier.
        The measurements left and right on the wings are measured from the
center line of the aircraft.
        Hope this helps you out