Garmin 480 Newsletter per gli utenti - Pagina 3

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Some Approach Examples

To look at approaches with and without vertical guidance I'll use some examples at KBZN (Bozeman, MT), KCVO (Corvallis, OR)

and KSLE (Salem, OR).

This approach is the GPS 12 approach to KBZN and has a couple of interesting twists to it. The profile view of the GPS 12 approach

shows a vertical path with a solid black line, but no mention of an Lnav/Vnav minimum. In this case, the MAP is offset from the end

of the runway by a half mile. This waypoint MADSE, is the D1.0 fix shown above and is the MAP which is the point the vertical

path will be built from.

In this case the vertical descent from EHUTU, the D6.0 fix, to the MAP is a shallow descent of just over 1000' with a lengthy leg of 5

NM to accomplish it in. Although not depicted, the database has a standard vertical profile of 3 degrees associated with the MAP.

Obviously you will not intercept this path at the FAF at 5900'. If you remain at 5900' MSL and continue on past the FAF, you will

intercept the vertical path outside of the MAP which will carry you down to the MDA at MADSE. At this point you can either

continue and land with the runway in sight or go missed. At MADSE the vertical guidance will be discontinued and the VDI flagged.

The GNS 480 will then sequence to the first leg of the missed approach.

Shown above is an excerpt from the RNAV GPS-A circling approach to KBZN. This approach is an Lnav only approach and does

not support vertical guidance, since the RW30 waypoint does not have an altitude and vertical path associated with it. The VDI will

remain flagged throughout the approach. If this approach depicted a light grey dashed line vertical profile at ZIPGO, then the GNS

480 would support vertical guidance.