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A learjet 35 first officer reported that the autopilot disengaged and the airplane began to pitch up rapidly causing an altitude deviation.
| Attributes | |
| ACN | 1509679 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Altitude Hold/Capture |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine Flight Crew Commercial |
| Experience | Flight Crew Last 90 Days 120 Flight Crew Total 1445 Flight Crew Type 120 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
While level at FL390; the altitude hold function on the autopilot disengaged and the airplane began to pitch up rapidly causing an altitude deviation. The crew disengaged the autopilot and began to correct the altitude deviation. While correcting; the airplane descended below and above FL390 up to 500 feet. After determining there was a problem with the autopilot; the crew requested a lower altitude outside of rvsm airspace. The crew was able to stabilize the aircraft at a lower altitude and land the aircraft safely.
Original NASA ASRS Text
Title: A Learjet 35 First Officer reported that the autopilot disengaged and the airplane began to pitch up rapidly causing an altitude deviation.
Narrative: While level at FL390; the altitude hold function on the autopilot disengaged and the airplane began to pitch up rapidly causing an altitude deviation. The crew disengaged the autopilot and began to correct the altitude deviation. While correcting; the airplane descended below and above FL390 up to 500 feet. After determining there was a problem with the autopilot; the crew requested a lower altitude outside of RVSM airspace. The crew was able to stabilize the aircraft at a lower altitude and land the aircraft safely.
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.