Garmin GTN 625Xi, Pilot'S Manual

Page: 282 / 534

3-140 Pilot’s Guide 190-02327-03 Rev. C
Navigation
If pilot exceeds the horizontal alarm limits:
•
Approach downgrades to non-precision
•
“LNAV” annunciates on Map to inform of the change
•
Advisory message: “GPS approach downgraded. Use LNAV minima.”
•
Pilot continues approach using LNAV non-precision minimums, if applicable
If GPS integrity does not meet the non-precision horizontal alarm limits:
•
Advisory message: “Abort Approach. GPS approach is no longer available.”
•
Pilot acknowledges message
•
Unit reverts to terminal limits of 1 nm to support navigation to the missed
approach
When crossing the final approach fix:
•
Waypoint sequences to the missed approach point
(e.g., RW31, the runway threshold)
•
Pilot flies toward missed approach point, keeping the needle on the external
CDI (or HSI) at center, observing published altitude minimums
•
Final course segment becomes the active flight plan leg on Map
Approaching missed approach point:
•
Advisory message: “Arriving at Waypoint.”
If the approach indicates “LP+V,” then advisory vertical guidance may be
removed without annunciation. This is due to the vertical guidance not being
within tolerances.
This does not constitute a downgrade. You may still fly the approach to LP
minimums.
Flying an LP approach with advisory vertical guidance (LP+V) does not change
how the approach should be flown. The pilot is still responsible for descending to
the correct altitude at each step down.
The result is still an MDA and missed approach point.