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Lear 35 pilot experienced an autopilot malfunction during the TEB6 departure causing the aircraft to pitch up and turn exceeding 1;500 ft restriction. Autopilot does not disengage normally when pilot attempts to regain control; which resulted in loss of separation with an ewr arrival.
| Attributes | |
| ACN | 870445 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | TEB.Airport |
| State Reference | NJ |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Takeoff |
| Route In Use | SID TEB6 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 70 Flight Crew Total 16700 Flight Crew Type 7000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
Flying the teb departure as published. On level off at 1;500 ft when the autopilot was engaged it pitched up 20 degrees and turned the airplane 30 degrees to the left. When I tried to disengage the autopilot from steering yoke; it would not disengage. I had to find the autopilot master switch on panel to get it to disengage. Maintenance confirmed it and replaced the autopilot computer. Yet to be returned to service.
Original NASA ASRS Text
Title: Lear 35 pilot experienced an autopilot malfunction during the TEB6 departure causing the aircraft to pitch up and turn exceeding 1;500 FT restriction. Autopilot does not disengage normally when pilot attempts to regain control; which resulted in loss of separation with an EWR arrival.
Narrative: Flying the TEB departure as published. On level off at 1;500 FT when the autopilot was engaged it pitched up 20 degrees and turned the airplane 30 degrees to the left. When I tried to disengage the autopilot from steering yoke; it would not disengage. I had to find the autopilot master switch on panel to get it to disengage. Maintenance confirmed it and replaced the autopilot computer. Yet to be returned to service.
Data retrieved from NASA's ASRS site as of April 2012 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.