B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 180; Flight Crew Type 1032
Aircraft Equipment Problem Less Severe
Flight Crew Diverted; Flight Crew Landed As Precaution; General Flight Cancelled / Delayed
Aircraft
While deviating north of course for thunderstorms along route at FL370 we noticed the right engine vibration indicator in the amber band and showing a value of 3.1. Flight conditions were IMC with SAT -47C so engine and wing anti-ice were off. We completed the Flight Manual 'Engine Vibration' checklist and ended up reducing thrust on right engine to remove amber indication. We requested a descent to FL310 and contacted Dispatch/ [Maintenance] via SATCOM to discuss options. Per [Maintenance] we turned on engine anti-ice but amber indication returned when thrust was increased. Decision was made to divert to [a nearby alternate] due to reduced thrust operation and proximity. Ran all required checklists and coordinated with ATC for clearance. Accomplished a normal ILS approach and landing. Cleared runway and accomplished normal taxi to gate.
[Report narrative contained no additional information.]
B757 flight crew reported diverting to an alternate airport after noticing a high vibration level in the right engine.