FLC OF AN ATX LTT RETURNED TO LAND AFTER THE R MAIN LNDG GEAR DID NOT INDICATE LOCKED IN THE UP POS AFTER RETRACTION.

Narrative

NORMAL TKOF FROM MCO. ON CLBOUT; FO (PF) CALLED FOR 'GEAR UP' AND I SELECTED SAME. THE 3 'IN TRANSIT' LIGHTS ILLUMINATED AS THE GEAR CYCLED; AND THE NORMAL SOUND WAS HEARD AS THE GEAR SETTLED INTO THE WHEEL WELLS. THE L MAIN AND NOISE 'IN TRANSIT' LIGHTS EXTINGUISHED; BUT THE R MAIN LIGHT STAYED ON. I POINTED THE SIT OUT TO THE FO; AND WITH HIS CONCURRENCE; I RECYCLED THE GEAR SEVERAL TIMES WITH NO CHANGE TO THE ANOMALY. WE ADVISED ATC THAT WE WOULD NEED TO RETURN WITH THE SPECIFICS OF THE NON- EMER SIT. WE ALSO CALLED COMPANY OPS TO DISCUSS THE SIT WITH A MECH; AND THEY ONLY RECOMMENDED CHKING ITEMS THAT WE HAD ALREADY CHKED. WE FLEW A NORMAL BOX PATTERN AS VECTORED BY ATC. WHEN THE GEAR WAS SELECTED DOWN; ALL INDICATIONS WERE NORMAL (3 GREEN 'DOWN' LIGHTS) AND TWR VERIFIED 3 EXTENDED GEAR VISUALLY WITH BINOCULARS. LNDG WAS NORMAL AND TAXI-IN WAS UNEVENTFUL. MECHS INSPECTED THE ACFT AND FOUND A BROKEN METAL PLATE THAT WOULD NORMALLY DEPRESS A MICROSWITCH IN THE R WHEEL WELL -- CONFIRMING 'GEAR UP.' THIS EXERCISE PROVED THAT OUR TRAINING (BOTH PROCEDURALLY AND WITH COCKPIT RESOURCE MGMNT) WORKED WELL TO HELP MITIGATE THIS ABNORMALITY SMOOTHLY; WITH NO ADDITIONAL PROBS.