<< >> NASA ASRS Report 816602, December 2008

LR40 captain reports engine vibration at FL410 and elects to divert. Engine vibration becomes worse during descent and engine is shut down. Uneventful landing ensues.

Attributes
ACN	816602
Time
Date	200812
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air taxi
Make Model Name	Learjet 40
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer
ASRS Report	816602
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : landed in emergency condition
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Cruising at FL410; began hearing and feeling a noise/vibration from the left side of aircraft. There were no abnormal indications at first. The noise became louder and then the emergency battery light began to flicker. I reduced the left power lever to idle and the noise/vibration went away. I decided to divert to ZZZ. Began a descent to ZZZ and the noise/vibration began again with the power lever still at idle. As noise got louder; I shut down the left engine. We landed in ZZZ with no further incident.

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Original NASA ASRS Text

Title: LR40 Captain reports engine vibration at FL410 and elects to divert. Engine vibration becomes worse during descent and engine is shut down. Uneventful landing ensues.

Narrative: Cruising at FL410; began hearing and feeling a noise/vibration from the left side of aircraft. There were no abnormal indications at first. The noise became louder and then the emergency battery light began to flicker. I reduced the left power lever to idle and the noise/vibration went away. I decided to divert to ZZZ. Began a descent to ZZZ and the noise/vibration began again with the power lever still at idle. As noise got louder; I shut down the left engine. We landed in ZZZ with no further incident.

Data retrieved from NASA's ASRS site as of May 2009 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.