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A C-208B autopilot malfunctioned on a coupled ILS so the pilot disconnected it; executed a go around and returned to land. ATC inquired about the event and was told maintenance action would follow.
| Attributes | |
| ACN | 1015768 |
| Time | |
| Date | 201206 |
| 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 | Caravan 208B |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 1525 Flight Crew Type 1260 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
| Miss Distance | Horizontal 400 Vertical 400 |
Narrative:
While shooting the ILS to 26R; I had an autopilot malfunction. This malfunction caused us to dramatically turn left and right and then oscillate up and down. I immediately disengaged the auto pilot and declared missed at that point so we could regain situational awareness. At that point; ATC asked the problem and we stated we were on the missed and would like to attempt the approach again. The second time was a success and I was given a phone number to call tower when I shut down. I called the tower and told them what happened and that I was calling my maintenance department to get the autopilot fixed. I wrote the autopilot up and it is scheduled to be repaired tomorrow.
Original NASA ASRS Text
Title: A C-208B autopilot malfunctioned on a coupled ILS so the pilot disconnected it; executed a go around and returned to land. ATC inquired about the event and was told maintenance action would follow.
Narrative: While shooting the ILS to 26R; I had an autopilot malfunction. This malfunction caused us to dramatically turn left and right and then oscillate up and down. I immediately disengaged the auto pilot and declared missed at that point so we could regain situational awareness. At that point; ATC asked the problem and we stated we were on the missed and would like to attempt the approach again. The second time was a success and I was given a phone number to call Tower when I shut down. I called the Tower and told them what happened and that I was calling my Maintenance Department to get the autopilot fixed. I wrote the autopilot up and it is scheduled to be repaired tomorrow.
Data retrieved from NASA's ASRS site as of July 2013 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.