<< >> NASA ASRS Report 950309, May 2011

LR45 captain experiences a right spoiler jam cas message at FL430. The autopilot disengages and the aircraft begins rocking [rolling] side to side about 15 degrees; without pilot input. An emergency is declared and flight diverts to the nearest suitable airport. Any control input for left roll produces a substantial roll to the left and the crew elects to make right turns only during descent and approach for landing.

Attributes
ACN	950309
Time
Date	201105
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 45
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Speedbrake/Spoiler
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 115 Flight Crew Total 5700 Flight Crew Type 1100
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

At FL430 we experienced a right spoiler jam cas message. The aircraft began rocking side to side approx 15 degrees; autopilot disengaged (without pilot input). As PIC; pilot not flying; I ran the checklist while PF maintained control of aircraft. We declared an emergency with center. We were rerouted to ZZZ and given descent and direct to the airport. Any movement of the flight control to the left induced a substantial roll force to the left; so we opted to make right 360 for descent. The right spoiler was jammed up between 1/2 and 1 inch above the surface of the wing (as described by passengers). The left spoiler was modulating up and down slightly and verified by indications in cockpit and roll forces to the left.

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Original NASA ASRS Text

Title: LR45 Captain experiences a R Spoiler Jam CAS message at FL430. The autopilot disengages and the aircraft begins rocking [rolling] side to side about 15 degrees; without pilot input. An emergency is declared and flight diverts to the nearest suitable airport. Any control input for left roll produces a substantial roll to the left and the crew elects to make right turns only during descent and approach for landing.

Narrative: At FL430 we experienced a R SPOILER JAM CAS Message. The aircraft began rocking side to side approx 15 degrees; autopilot disengaged (without pilot input). As PIC; pilot not flying; I ran the checklist while PF maintained control of aircraft. We declared an emergency with Center. We were rerouted to ZZZ and given descent and direct to the airport. Any movement of the flight control to the left induced a substantial roll force to the left; so we opted to make right 360 for descent. The right spoiler was jammed up between 1/2 and 1 inch above the surface of the wing (as described by passengers). The left spoiler was modulating up and down slightly and verified by indications in cockpit and roll forces to the left.

Data retrieved from NASA's ASRS site as of April 2012 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.