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A flight crew reported their FMS failed while conducting an approach; they became unstable and off course and initiated a missed approach.
| Attributes | |
| ACN | 1654078 |
| Time | |
| Date | 201906 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | TEB.Airport |
| State Reference | NY |
| Environment | |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | Challenger 350 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Component | |
| Aircraft Component | GPS & Other Satellite Navigation |
| Person 1 | |
| Function | Captain Pilot Flying |
| Person 2 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Unstabilized Approach |
Narrative:
While on the ILS approach; we did not get the FMS to sequence from magenta needle to green needle in a timely manner. We were unsure why it was taking so long. We thought for a moment that it had something to do with the known GPS issues that the avionics were having in our fleet. We were about 2.3 miles from the final approach fix (FAF) with it yet to sequence. In a hurry; we changed flight modes manually to green needles; but in our haste; the approach became out of parameters quickly and a missed approach was initiated. In our hurried state; we failed to sequence the FMS to the missed approach and soon got off course. This was brought to our attention by approach. We were given a heading and we returned for an uneventful approach and landing. In hindsight; I should of never allowed the aircraft to get so close to the FAF in this state. It set up some confusion and haste which in my opinion led to our deviation. I initiated the go around later than I should have and would do it much sooner in hindsight.
Original NASA ASRS Text
Title: A flight crew reported their FMS failed while conducting an approach; they became unstable and off course and initiated a missed approach.
Narrative: While on the ILS approach; we did not get the FMS to sequence from magenta needle to green needle in a timely manner. We were unsure why it was taking so long. We thought for a moment that it had something to do with the known GPS issues that the avionics were having in our fleet. We were about 2.3 miles from the Final Approach Fix (FAF) with it yet to sequence. In a hurry; we changed flight modes manually to green needles; but in our haste; the approach became out of parameters quickly and a missed approach was initiated. In our hurried state; we failed to sequence the FMS to the missed approach and soon got off course. This was brought to our attention by Approach. We were given a heading and we returned for an uneventful approach and landing. In hindsight; I should of never allowed the aircraft to get so close to the FAF in this state. It set up some confusion and haste which in my opinion led to our deviation. I initiated the go around later than I should have and would do it much sooner in hindsight.
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.