The big difference: how they are constructed. This is one reason an LPV is not a precision approach by definition.Īn ILS Glideslope and an LPV Glidepath are similar in that they both provide an obstacle-free path to the runway. For example, LNAV/VNAV and LPV are APV approaches.”įor pilots that may not be familiar with ICAO Annex 10, it’s a long list of requirements to which an ILS must conform. For example, PAR, ILS and GLS…Īpproach with vertical guidance (APV) is an instrument approach based on a navigation system that is not required to meet the precision approach standards of ICAO Annex 10 but provides course and glidepath deviation information. “ a precision approach is an instrument approach based on a navigation system that provides course guidance and glidepath deviation meeting the precision standards of ICAO Annex 10. An ILS is a precision approach by definition, whereas an approach with LPV minimums is an approach with vertical guidance. This article will explain why an LPV glidepath may differ from an ILS glideslope, especially when descending below the DA.ĭespite the operational consistency, these approach types are very different, beginning with their definitions. ![]() Behind the scenes, there is vastly different technology at work to make it all appear the same on the surface. From an operational perspective, we load the approach, press the approach button, and watch the magic happen. ILS and LPV have become almost synonymous with how operators perceive them.
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