Re: Aircraft Weight calc. question

From: (FMCDave)
Organization: America Online, Inc. (1-800-827-6364)
Date:         27 Apr 95 03:00:27 
References:   1
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-It is not only the weight that has to be taken into account but also the
-balance. When loading an airplane you have to assure, that the center of
-gravity of the loaded plane is within certain prescribed limlits.
-While certification process it has to be shown that the airplane can be
-handled safely even with C/G being at either forward or aft limit.

Note that some aircraft (747-400) have an option for a Weight and Balance
System which provides direct weight inputs (from strut mounted sensorts)
to the Flight Management System and trim system.  This takes the guess
work out.