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A CE680 at FL410 begins a shallow descent which then causes the auto pilot to disengage. The descent steepens and the crew is initially unable to arrest the descent. Control is regained at FL390 after completing memory items and QRH procedures. Secondary trim is selected and the diversion is flown without further difficulty.
| Attributes | |
| ACN | 1287724 |
| Time | |
| Date | 201508 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Cessna Citation Sovereign (C680) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Horizontal Stabilizer Trim |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
Cruising at FL410; the aircraft began a shallow decent followed by a cyan auto pilot a/B fail. This was followed by a sharper decent and at approx. 40;600 feet we advised ATC we unable to maintain altitude. After completing memory items qrc and QRH we were able to regain control of the aircraft and level at FL390. We diverted to ZZZ and the remainder of the flight was uneventful.
Original NASA ASRS Text
Title: A CE680 at FL410 begins a shallow descent which then causes the auto pilot to disengage. The descent steepens and the crew is initially unable to arrest the descent. Control is regained at FL390 after completing memory items and QRH procedures. Secondary trim is selected and the diversion is flown without further difficulty.
Narrative: Cruising at FL410; the aircraft began a shallow decent followed by a cyan auto pilot A/B fail. This was followed by a sharper decent and at approx. 40;600 feet we advised ATC we unable to maintain altitude. After completing memory items QRC and QRH we were able to regain control of the aircraft and level at FL390. We diverted to ZZZ and the remainder of the flight was uneventful.
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.