B757 captain experiences sever engine vibration climbing through FL370. The vibration disappears onl...

Attributes
ACN	950631
Time
Date	201105
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Engineer Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 84 Flight Crew Total 8440 Flight Crew Type 442
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Climbing through FL370 to our final cruising altitude of FL380 aircraft began a sudden shudder and vibration; along with a significant loss of vertical speed. Looking down at the engine instruments; the left engine vibration indicator was at 3.7 boxed amber and continued rapidly to 4.0 boxed amber before I could retard the thrust lever. Bringing the thrust lever to near idle resulted in stable engine indications; and we ran the engine vibration QRH checklist. Any attempt to move the throttle forward resulted in an immediate return of bad indications and aircraft vibrations. We left the engine in the near idle position in accordance with the QRH procedure; and declared an emergency; and diverted to an airport 60 NM away and VFR. On final approach we also received an 'antiskid' EICAS message; and subsequently ran that QRH checklist; and landed uneventfully.

Original NASA ASRS Text

Title: B757 Captain experiences sever engine vibration climbing through FL370. The vibration disappears only with the thrust lever at idle and the crew elects to divert after declaring an emergency.

Narrative: Climbing through FL370 to our final cruising altitude of FL380 aircraft began a sudden shudder and vibration; along with a significant loss of vertical speed. Looking down at the engine instruments; the left engine vibration indicator was at 3.7 boxed amber and continued rapidly to 4.0 boxed amber before I could retard the thrust lever. Bringing the thrust lever to near idle resulted in stable engine indications; and we ran the engine vibration QRH checklist. Any attempt to move the throttle forward resulted in an immediate return of bad indications and aircraft vibrations. We left the engine in the near idle position in accordance with the QRH procedure; and declared an emergency; and diverted to an airport 60 NM away and VFR. On final approach we also received an 'Antiskid' EICAS message; and subsequently ran that QRH checklist; and landed uneventfully.

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.

B757 captain experiences sever engine vibration climbing through FL370. The vibration disappears only with the thrust lever at idle and the crew elects to divert after declaring an emergency.