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Small transport flight crew reported an autopilot malfunction as they were capturing the localizer causing them to leave their assigned altitude.
| Attributes | |
| ACN | 1583652 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | TEB.Airport |
| State Reference | NJ |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Small Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
While intercepting ILS 19 approach into teb the aircraft did not capture the localizer and approach mode was re-engaged. At that time the aircraft climbed uncommanded while autopilot was engaged and in altitude hold. We both recognized the 'uncommanded pitch up' and corrected our altitude. ATC (ny TRACON) then queried our altitude and we replied with our current corrected altitude of 2;000 feet. I also noticed a yellow FD1 on my copilot pfd.
Original NASA ASRS Text
Title: Small Transport flight crew reported an autopilot malfunction as they were capturing the localizer causing them to leave their assigned altitude.
Narrative: While intercepting ILS 19 Approach into TEB the aircraft did not capture the localizer and approach mode was re-engaged. At that time the aircraft climbed uncommanded while autopilot was engaged and in altitude hold. We both recognized the 'uncommanded pitch up' and corrected our altitude. ATC (NY TRACON) then queried our altitude and we replied with our current corrected altitude of 2;000 feet. I also noticed a yellow FD1 on my copilot PFD.
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.