An hs-125-700 developed an intermittent vibration of unknown origin at cruise. During descent; the r...

Attributes
ACN	827744
Time
Date	200903
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	HS 125 Series 700
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 16800 Flight Crew Type 2000
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 4000 Flight Crew Type 450
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

While at cruise; we experienced occasional and intermittent vibrations of an unknown origin. On descent passing FL200; the vibration became constant and we brought engine #2 to idle. The vibration initially lessened with #2 at idle. We continued toward our destination. Passing 15;000 ft; the vibration grew worse and we elected to shut down the #2 engine; declared an emergency. The vibrations stopped with engine shutdown. Upon completing the engine shutdown checklist; the destination was in sight. We made a constant rate descent from the time of shutting down the engine and a visual approach to runway 12 and landed uneventfully. Supplemental information from acn 827742: at that point it was decided to continue on to ZZZ as it was determined to be the nearest suitable airport in point of time for a safe landing to be made. The aircraft was then cleared for a visual approach and landing at ZZZ where a normal landing was carried out; with no emergency services required.

Original NASA ASRS Text

Title: An HS-125-700 developed an intermittent vibration of unknown origin at cruise. During descent; the right engine developed a vibration and was shutdown. An emergency was declared and the aircraft continued to its destination.

Narrative: While at cruise; we experienced occasional and intermittent vibrations of an unknown origin. On descent passing FL200; the vibration became constant and we brought engine #2 to idle. The vibration initially lessened with #2 at idle. We continued toward our destination. Passing 15;000 FT; the vibration grew worse and we elected to shut down the #2 engine; declared an emergency. The vibrations stopped with engine shutdown. Upon completing the Engine Shutdown checklist; the destination was in sight. We made a constant rate descent from the time of shutting down the engine and a visual approach to Runway 12 and landed uneventfully. Supplemental information from ACN 827742: At that point it was decided to continue on to ZZZ as it was determined to be the nearest suitable airport in point of time for a safe landing to be made. The aircraft was then cleared for a visual approach and landing at ZZZ where a normal landing was carried out; with no emergency services required.

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.

An hs-125-700 developed an intermittent vibration of unknown origin at cruise. During descent; the right engine developed a vibration and was shutdown. An emergency was declared and the aircraft continued to its destination.