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Old 25th January 2010 | 15:20
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MD83FO
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Joined: Apr 2006
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From: Asia
A320 FM Position

The wording on the FCOM keeps me confused.

What is the aircraft using for present position
at all times when gps primary:

actual position? (gps)
or
mix GPIRS? which is obviously drifting.

What I'm thinking is why would the a/c use a IRU drifting value
when it can use gps, then if gps pos is drifting from the 3 mix GPIRS's its can assume IRS pos.

cheers guys. gps
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