B757-200
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter Unstabilized Approach
Air Traffic Control Provided Assistance; Flight Crew Diverted; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft; Weather
Final approach to ZZZZ for a 22 knot crosswind landing. We got a Rudder Ratio Light and EICAS Message. Elected to go around knowing it would potentially restrict performance in particular to a cross wind landing. Ran the QRH; and it limited our winds to 15 knots crosswind landing so needed to divert. Selected ZZZZ1 due to its proximity and favorable winds and declared an emergency for our flight control malfunction. Landed at ZZZZ1 without further incident.
On final at 160-170 knots; got Rudder Ratio EICAS. Hydraulic pressure was normal.  Complied with QRH; and diverted due to wind limitations.  Flight diverted to ZZZZ1.  Priority handling was requested by crew.
B757-200 flight crew and a Dispatcher reported a Rudder Ratio EICAS Message on approach resulting in a go-around. Winds were out of limits for landing so the flight crew elected to divert a nearby suitable airport.