A B757-200 flight crew diverted to an enroute airport upon receipt of rudder ratio and ail lock EICA...

Narrative:

While climbing through 25;000 ft; the rudder ratio light and associated EICAS message illuminated; followed by the ail lock light and aileron lockout EICAS message. We were then unable to engage any of the autopilots. Completed all QRH checklists and viewed the flight control indications. After contacting dispatch and maintenance control we decided to declare an emergency and divert to another airport. On approach; the captain noted that the aileron controls were very stiff. Landing was uneventful. No further problems.

Original NASA ASRS Text

Title: A B757-200 flight crew diverted to an enroute airport upon receipt of RUDDER RATIO and AIL LOCK EICAS messages. The Captain reported the aileron controls were very stiff on the approach.

Narrative: While climbing through 25;000 FT; the RUDDER RATIO light and associated EICAS message illuminated; followed by the AIL LOCK light and Aileron Lockout EICAS message. We were then unable to engage any of the autopilots. Completed all QRH checklists and viewed the flight control indications. After contacting dispatch and Maintenance Control we decided to declare an emergency and divert to another airport. On approach; the Captain noted that the aileron controls were very stiff. Landing was uneventful. No further problems.

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.

Attributes
ACN	958749
Time
Date	201107
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Rudder Feel System
Person 1
Function	First Officer
Person 2
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Hazardous Material Violation

A B757-200 flight crew diverted to an enroute airport upon receipt of rudder ratio and ail lock EICAS messages. The captain reported the aileron controls were very stiff on the approach.