Narrative:

After going through a period of light chop with 2 or 3 isolated moderate bumps, all less than 4 mins, I noticed both control columns almost fully deflected to the left. Assessed all system, and concluded the right aileron jammed fully deployed position. I called for a checklist in the QRH and concluded it was not applicable, although we did the checklist. It was for a different situation. I declared an emergency into orf, and landed uneventfully. The cause of the jammed aileron is the cable to that aileron snapped and broke. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B737-200 and the problem with the right aileron was the failed cable allowed the aileron to displace full up. He also stated he had no left roll control but was able to control roll through the flight spoilers. He said maintenance removed the failed cable and all indications were it just snapped, no fraying or wear was evident. He advises the cable is in the FAA laboratory for investigation.

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Original NASA ASRS Text

Title: A B737-200 IN CRUISE DECLARED AN EMER AND DIVERTED DUE TO LOSS OF AILERON CTL CAUSED BY CTL CABLE FAILURE.

Narrative: AFTER GOING THROUGH A PERIOD OF LIGHT CHOP WITH 2 OR 3 ISOLATED MODERATE BUMPS, ALL LESS THAN 4 MINS, I NOTICED BOTH CTL COLUMNS ALMOST FULLY DEFLECTED TO THE L. ASSESSED ALL SYS, AND CONCLUDED THE R AILERON JAMMED FULLY DEPLOYED POS. I CALLED FOR A CHKLIST IN THE QRH AND CONCLUDED IT WAS NOT APPLICABLE, ALTHOUGH WE DID THE CHKLIST. IT WAS FOR A DIFFERENT SIT. I DECLARED AN EMER INTO ORF, AND LANDED UNEVENTFULLY. THE CAUSE OF THE JAMMED AILERON IS THE CABLE TO THAT AILERON SNAPPED AND BROKE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B737-200 AND THE PROB WITH THE R AILERON WAS THE FAILED CABLE ALLOWED THE AILERON TO DISPLACE FULL UP. HE ALSO STATED HE HAD NO L ROLL CTL BUT WAS ABLE TO CTL ROLL THROUGH THE FLT SPOILERS. HE SAID MAINT REMOVED THE FAILED CABLE AND ALL INDICATIONS WERE IT JUST SNAPPED, NO FRAYING OR WEAR WAS EVIDENT. HE ADVISES THE CABLE IS IN THE FAA LABORATORY FOR INVESTIGATION.

Data retrieved from NASA's ASRS site as of July 2007 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.