Re: 747-400 Magnetic Detectors

From:         Jean-Francois Mezei <>
Organization: Vaxination Informatique
Date:         13 Sep 96 03:03:36 
References:   1 2 3
Followups:    1
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Many have mentioned that the pilots must give the INS system time to
align after they have entered the lat-long values at the gate and that
during this time, there must not be any movement so that the INS can
sense the earth's rotation and align itself.

With the shorter and shorter plane turn arounds, when do pilots get to
do this ? Can this be done while passengers are entering the plane ?
Can this be done while cargo is being loaded ?

On a narrowbody plane, wouldn't the entry of two rather heavy passengers
cause a bit of a movement (vertical) of the plane ? (Or more evidently,
the loading of a heavy cargo pallet) ?