Date: 28 Dec 96 14:20:09 From: Mark Anderson <firstname.lastname@example.org> Organization: none References: 1 2 Followups: 1 2
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That KAL 747 was equiped with triplemix INS. INS systems determine their own true heading and therefore do not depend on an external heading input. There is no function to input grid navigational inputs into INS. Heading indications to the Horizontal Situation Indicators are also taken off the INS systems. Grid nav functionality is required with electronic nav systems that depend on mag course as a primary means of navigation. North of lat. 70N, navigational unreliability is compounded with magnetic unreliability and accelerated changes in true or mag course. The final report regarding this accident was the entry of the route from the flight plan. With triplemix INS's installed, one of the pilots keyed in the incorrect route into one system and then crossed filled the bogus route into the other two systems. The pilots didn't use procedures that we use today which includes cross checking the flight plan to the installed routes and to cross reference raw data with the flight plan to determind electronic navigation performance. Purhaps we all learned a lesson with 007. Unlike the Air Force of today, the commercial airlines gave up on navigators in the late 60's with the installation of electronic navigation.