Re: Boeing 737 new gen nav systems

Date:         27 Aug 99 14:03:48 
From:         "Tarver Engineering" <jtarver@tminet.com>
Organization: Posted via Supernews, http://www.supernews.com
References:   1
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COMP1001 Student wrote in message ...
>I work in the pacific, while crossing the 180 meridian flying from such
>places as nadi to tonga, syd to tonga, on various occassions i have had
>the powers come back, unwarranted turn and loss of flight plans.
>operating procedures now dictate that we go "hdg select" 10 miles prior
>to the 180 and resume the fmc flight plan 10 miles after crossing the
>180.

It sounds like a twos compliment problem and has occured for traveling over
the north pole as well.

>i would appreciate it if anyone could enlighten me as to why this
>happens, i know that similar problems can occur on gps machines.

It is a math problem, not a technology one.

John