<< >> NASA ASRS Report 1490635, October 2017

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.

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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.