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CE680 first officer reported their aircraft made an uncommanded climb due to the autopilot malfunctioning.
| Attributes | |
| ACN | 1580051 |
| Time | |
| Date | 201809 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZKC.ARTCC |
| State Reference | KS |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Cessna Citation Sovereign (C680) |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| 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 |
Narrative:
At cruise at 40;000 feet; 3 hours into our flight between navigation points while scanning the instruments I noticed a flashing 'pitch' mode annunciation on the pfd (primary flight display). The aircraft then started an uncommanded climb. During this brief time I also saw the standby attitude indicator show red X's on attitude; altitude and airspeed. I told the pilot in command 'we are climbing in pitch mode; select vertical speed and recover!' during the altitude recovery the standby altitude showed as high as 47;000 feet then flashed a series of numbers. We never exceeded an actual altitude of more 40;200 feet. Once restabilized at 40;000 feet; the standby attitude; airspeed and altimeter also stabilized but the standby altitude was off as much as 260 feet high.the autopilot changed modes uncommanded from altitude to pitch and the aircraft started an uncommanded climb. We recovered; called the company and maintenance. We were then told to divert. We also notified ATC of an avionics issue and that we were diverting for maintenance.
Original NASA ASRS Text
Title: CE680 First Officer reported their aircraft made an uncommanded climb due to the autopilot malfunctioning.
Narrative: At cruise at 40;000 feet; 3 hours into our flight between navigation points while scanning the instruments I noticed a flashing 'PITCH' mode annunciation on the PFD (Primary Flight Display). The aircraft then started an uncommanded climb. During this brief time I also saw the standby attitude indicator show red X's on attitude; altitude and airspeed. I told the Pilot in Command 'we are climbing in pitch mode; select vertical speed and recover!' During the altitude recovery the standby altitude showed as high as 47;000 feet then flashed a series of numbers. We never exceeded an actual altitude of more 40;200 feet. Once restabilized at 40;000 feet; the standby attitude; airspeed and altimeter also stabilized but the standby altitude was off as much as 260 feet high.The autopilot changed modes uncommanded from ALT to PITCH and the aircraft started an uncommanded climb. We recovered; called the company and Maintenance. We were then told to divert. We also notified ATC of an avionics issue and that we were diverting for maintenance.
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.