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Old 23rd Apr 2012, 13:38
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Andrew_Flora
 
Join Date: Oct 2009
Location: Kiyv
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VNAV & FMS updating modes
Hi

Are there any restrictions on FMS-VNAV-equipped aircrafts on using of VNAV mode when FMS works in inaccurate updating mode like
IRS VOR/DME or IRS?

The point is in influence of lateral errors on vertical path deviations, especially on approach phase of flight.

Thanks.
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