A HS125-800A crew determined an airframe vibration was originating from the number two engine so the...

Attributes
ACN	1088017
Time
Date	201305
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 1875 Flight Crew Type 510
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Cruising at FL400; the crew felt an airframe vibration start suddenly and with no warning. The vibration origin was unknown at the time of onset but after further investigation with both crew members individually going into the cabin; we suspected the vibration was originating from rear of the aircraft. Thinking that it was an engine causing the vibration we pulled out the engine vibration emergency checklist. After following the checklist the crew determined that changing power on the number 2 engine affected the tone of the vibration but not the severity. Changing power on the number 1 engine did not affect either the tone or severity of the vibration. The checklist calls for precautionary shutdown of the engine where the vibration is suspected. At this point we declared an emergency; requested a lower altitude; determined the best diversion airport; and requested a new clearance. After completing the engine securing emergency checklist and single-engine approach and landing checklist; the remainder of the flight was non eventful. We landed and taxied in with no other problems.

Original NASA ASRS Text

Title: A HS125-800A crew determined an airframe vibration was originating from the Number two engine so they declared an emergency; shut the engine down using the Engine Vibration Emergency Checklist and diverted to a nearby airport.

Narrative: Cruising at FL400; the crew felt an airframe vibration start suddenly and with no warning. The vibration origin was unknown at the time of onset but after further investigation with both crew members individually going into the cabin; we suspected the vibration was originating from rear of the aircraft. Thinking that it was an engine causing the vibration we pulled out the Engine Vibration Emergency checklist. After following the checklist the crew determined that changing power on the Number 2 engine affected the tone of the vibration but not the severity. Changing power on the Number 1 engine did not affect either the tone or severity of the vibration. The checklist calls for precautionary shutdown of the engine where the vibration is suspected. At this point we declared an emergency; requested a lower altitude; determined the best diversion airport; and requested a new clearance. After completing the Engine Securing Emergency checklist and Single-Engine Approach and Landing checklist; the remainder of the flight was non eventful. We landed and taxied in with no other problems.

Data retrieved from NASA's ASRS site as of July 2013 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.

A HS125-800A crew determined an airframe vibration was originating from the number two engine so they declared an emergency; shut the engine down using the engine vibration emergency checklist and diverted to a nearby airport.