How many stepdown waypoints are there on the ORD RNAV Z 28L if you are shooting the LNAV approach and starting the approach at VOGLR at 9,000ft?

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To analyze how many stepdown waypoints exist on the ORD RNAV Z 28L LNAV approach when starting at VOGLR at 9,000 ft, we need to count the discrete altitude-restricted fixes along the LNAV final approach path from VOGLR down to the runway.

Option 9: This would be correct only if there were nine distinct stepdown fixes between VOGLR and the runway. In practice, the chart shows eight clearly defined stepdown fixes along the LNAV final approach segment, so counting nine would imply including one extra point that isn’t a formal stepdown waypoint on the LNAV path.

Option 8: Each stepdown fix along the LNAV portion between VOGLR (9000 ft) and the missed approach/landing point constitutes a stepdown waypoint. The procedure diagram and profile view display a sequence of eight distinct fixes with altitude constraints that mark legitimate stepdowns, leading to the final approach altitude/decision point. Therefore, eight stepdowns is the accurate count as depicted.

Option 7: If someone miscounts by merging or omitting one of the fixes (for example, treating the final approach fix or the point just before the runway as non-stepdown), they might land on seven. However, the official stepdown sequence includes eight properly defined points, so seven undercounts the procedure.

Option 10: Adding a tenth stepdown would require an additional, formally published altitude-constrained fix that is not present on the depicted LNAV path. The chart’s LNAV final approach segment does not show an extra stepdown beyond the eight, so this overcounts the procedure.

In summary, the number of stepdown waypoints is determined by the published sequence of altitude-constrained fixes along the LNAV final approach. The ORD RNAV Z RWY 28L LNAV path, as depicted, includes eight such stepdown fixes, making eight the correct count. The other options result from counting errors, such as overcounting, undercounting, or including non-stepdown points, none of which align with the charted procedure.

FA_221 Lesson 23 Quiz

How many stepdown waypoints are there on the ORD RNAV Z 28L if you are shooting the LNAV approach and starting the approach at VOGLR at 9,000ft?

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