BAe 125 Series 800
Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 150; Flight Crew Total 1875; Flight Crew Type 510
Troubleshooting; Situational Awareness; Distraction; Confusion
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
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.
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.