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Thread: FMC position calculation and logic for primary GPS update
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Old 15th Oct 2015, 09:04
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Intruder
 
Join Date: May 2000
Location: Seattle
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For the 747-400:

1. If GPS is working, it is used for primary position. An IRS(3) (weighted "triple mix" of 3 IRU positions) is also calculated, and used if GPS fails.

2. Left GPS updates feeds FMC. Right GPS feeds right FMC.
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