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SR22 pilot reported autopilot failed to level off in time and resulted in overshoot and ATC low altitude alert.
| Attributes | |
| ACN | 1681938 |
| Time | |
| Date | 201909 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | SR22 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Final Approach |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Single Pilot |
| Qualification | Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 2700 Flight Crew Type 1320 |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
Was waiting for approach sequencing at 6000 feet. ATC asked my max speed on final and I gave them 160. ATC gave me a vector to intercept the localizer and asked that I maintain 170 knots and maintain 3000 feet until established. I was almost established when they gave me the vector in [to] intercept so I had to descend very fast to get below the glideslope; intercept; and maintain 170 knots. Typical approach speed in a SR22 is 100-120 knots but going into ZZZ this is very common to be asked to maintain 150-160. I was operating with the autopilot and upon reaching the 3000 feet altitude the autopilot did not arrest descent and the plane went well below 3000 feet before I could recognize it did not capture and disconnect the autopilot. I immediately pulled up to return to the assigned altitude. Lateral guidance was fine. ATC got a low altitude alarm and asked me to pull up within seconds of me manually arresting the descent. Climbed back to the altitude for that segment; returned to requested speed and hand flew the rest of the approach. Once over to tower they asked [that] I slow because I was starting to encroach on the leading traffic. ATC asked if I wanted to be vectored for another attempt but since lateral guidance was maintained and the plane was climbing fine I elected to continue the approach.
Original NASA ASRS Text
Title: SR22 pilot reported autopilot failed to level off in time and resulted in overshoot and ATC low altitude alert.
Narrative: Was waiting for approach sequencing at 6000 feet. ATC asked my max speed on final and I gave them 160. ATC gave me a vector to intercept the localizer and asked that I maintain 170 knots and maintain 3000 feet until established. I was almost established when they gave me the vector in [to] intercept so I had to descend very fast to get below the glideslope; intercept; and maintain 170 knots. Typical approach speed in a SR22 is 100-120 knots but going into ZZZ this is very common to be asked to maintain 150-160. I was operating with the autopilot and upon reaching the 3000 feet altitude the autopilot did not arrest descent and the plane went well below 3000 feet before I could recognize it did not capture and disconnect the autopilot. I immediately pulled up to return to the assigned altitude. Lateral guidance was fine. ATC got a low altitude alarm and asked me to pull up within seconds of me manually arresting the descent. Climbed back to the altitude for that segment; returned to requested speed and hand flew the rest of the approach. Once over to Tower they asked [that] I slow because I was starting to encroach on the leading traffic. ATC asked if I wanted to be vectored for another attempt but since lateral guidance was maintained and the plane was climbing fine I elected to continue the approach.
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.