IFD400 Series Pilot Guide
5-38 Navigation
The leg has an associated altitude constraint that is lower
than the aircraft altitude
Lateral deviation from the active leg is less than 2nm
Course deviation from the active leg is less than 45°
The IFD is receiving valid baro corrected altitude
Vertical Direct-to LSK
ENROUTE VNAV INDICATIONS
When enroute VNAV is active, the IFD will suffix the navigation
mode with “+V”, indicating that associated vertical deviations are
being provided.
Enroute VNAV Active “+V” Indication
Enroute VNAV deviations can be displayed on some external
indicators and will continue to be provided along the descent until
the target altitude has been reached. During descent, if the
aircraft deviates from the intended flight path by more than 2nm
or if the aircraft course deviates by more than 45 degrees from
the desired track, enroute VNAV deviations will be flagged until
the aircraft resumes flight along the flight plan.
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