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Be-200 pilot reported descending below the glide slope on approach when he followed the pro line 21 VNAV signal instead of the ILS glide slope.
| Attributes | |
| ACN | 1518878 |
| Time | |
| Date | 201802 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | SDF.Airport |
| State Reference | KY |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Super King Air 200 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Route In Use | Other ILS |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Single Pilot |
| Qualification | Flight Crew Instrument Flight Crew Private Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 6000 Flight Crew Type 170 |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Inflight Event / Encounter Unstabilized Approach Inflight Event / Encounter CFTT / CFIT |
Narrative:
The approach to 17L was a bit rushed as traffic was heavy. I intercepted what I thought was the glideslope but in the pro line 21 system it was the VNAV bug. Both are green; and one is a snowflake; the other is a diamond. I thought the snowflake was the ILS glideslope and manually took over and flew down the course. I should have correlated altitude with position but was hurried; and continued until I got the glideslope and low altitude alert from tower. I climbed out and subsequently made a normal ILS to landing. Lesson learned on getting rid of the VNAV bug on ILS approaches; and keeping situational awareness despite other factors; and initiating go around at first sign of something not making sense. I spend more time in another aircraft that is also a pro line 21 aircraft; but the VNAV bug is magenta and is less likely to be confused. Basic airmanship needs to stay in the picture versus following the FMS to the wrong place.
Original NASA ASRS Text
Title: BE-200 pilot reported descending below the glide slope on approach when he followed the Pro Line 21 VNAV signal instead of the ILS glide slope.
Narrative: The approach to 17L was a bit rushed as traffic was heavy. I intercepted what I thought was the glideslope but in the Pro Line 21 system it was the VNAV bug. Both are green; and one is a snowflake; the other is a diamond. I thought the snowflake was the ILS glideslope and manually took over and flew down the course. I should have correlated altitude with position but was hurried; and continued until I got the glideslope and low altitude alert from Tower. I climbed out and subsequently made a normal ILS to landing. Lesson learned on getting rid of the VNAV bug on ILS approaches; and keeping situational awareness despite other factors; and initiating go around at first sign of something not making sense. I spend more time in another aircraft that is also a Pro Line 21 aircraft; but the VNAV bug is magenta and is less likely to be confused. Basic airmanship needs to stay in the picture versus following the FMS to the wrong place.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.