<< >> NASA ASRS Report 1257385, April 2015

Lear 45 flight crew reported an uncontrolled climb to FL412 from FL400 as a result of moderate to severe turbulence.

Attributes
ACN	1257385
Time
Date	201504
Local Time Of Day	1201-1800
Place
Locale Reference	ZDC.ARTCC
State Reference	VA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Learjet 45
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 70 Flight Crew Total 4000 Flight Crew Type 1500
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 125 Flight Crew Total 3500 Flight Crew Type 1500
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence

Narrative:

In cruise at FL400 encountered moderate turbulence. We asked to descend to FL380 and washington center approved the request. As we initiated the descent; the turbulence increased and caused us to uncontrollably climb at a rate of up to 2500 feet per minute for 20 to 30 seconds. I immediately instructed my first officer to advise ATC we were in an uncontrolled climb. It was not until 41;200 feet we were able to arrest the climb and reinitiate the descent. As we passed back through FL400 again the turbulence started to decrease our descent rate but was not strong enough to cause us to climb again. We leveled at FL380 and had a smooth ride and continued the flight as normal.

Related reports:

• Pilot of an small aircraft sel declared an emergency and div...
• SF340 first officer reports a GPWS warning and escape maneuv...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: Lear 45 flight crew reported an uncontrolled climb to FL412 from FL400 as a result of moderate to severe turbulence.

Narrative: In cruise at FL400 encountered moderate turbulence. We asked to descend to FL380 and Washington Center approved the request. As we initiated the descent; the turbulence increased and caused us to uncontrollably climb at a rate of up to 2500 feet per minute for 20 to 30 seconds. I immediately instructed my first officer to advise ATC we were in an uncontrolled climb. It was not until 41;200 feet we were able to arrest the climb and reinitiate the descent. As we passed back through FL400 again the turbulence started to decrease our descent rate but was not strong enough to cause us to climb again. We leveled at FL380 and had a smooth ride and continued the flight as normal.

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.