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LJ31 flight crew reported encountering clear air turbulence and loss of aircraft control at FL450 with an altitude loss of 800 feet.
| Attributes | |
| ACN | 1490635 |
| Time | |
| Date | 201710 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Learjet 31 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Speed All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence |
Narrative:
Cruise phase of flight. 45;000 feet experienced clear air turbulence. Aircraft began to pitch and roll uncontrollably. Airspeed fluctuations +/- 10-20 knots. Loss of altitude was approximately 800 feet. Regained positive control of aircraft after reaching 44;200 feet. No passengers were on board; no damage to aircraft was done. ATC was immediately notified of occurrence and was issued a descent to 41;000 feet. Incident lasted approximately 15 seconds.
Original NASA ASRS Text
Title: LJ31 flight crew reported encountering clear air turbulence and loss of aircraft control at FL450 with an altitude loss of 800 feet.
Narrative: Cruise phase of flight. 45;000 feet experienced Clear Air Turbulence. Aircraft began to pitch and roll uncontrollably. Airspeed fluctuations +/- 10-20 knots. Loss of altitude was approximately 800 feet. Regained positive control of aircraft after reaching 44;200 feet. No Passengers were on board; no damage to aircraft was done. ATC was immediately notified of occurrence and was issued a descent to 41;000 feet. Incident lasted approximately 15 seconds.
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.