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Old 2nd Nov 2010, 23:10
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Exaviator
 
Join Date: Mar 2009
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I can't comment on the 777 specifically but when multiple systems are fitted to aircraft airlines often adopt a policy of alternating usage. i.e Unit 1 on outbound flights, Unit 2 on return flights. Or Capt flying Unit 1 and F/O Unit 2.

Does this help? Cheers
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