What was found
ON APPROACH FOR LANDING, LANDING GEAR WOULD NOT EXTEND ELECTRICALLY AND AN ODOR WAS NOTICED IN THE COCKPIT. THE GEAR WAS EXTENDED MANUALLY, BUT A LOUD POPPING NOISE WAS HEARD UPON EXTENSION. INSPECTION OF THE GEAR AFTER LANDING FOUND RT UPLOCK ROLLER SEIZED. THIS ROLLER WOULD NOT DISENGAGE FROM PN 35-845077-22 RT UPLOCK BLOCK; THUS, ALLOWING GEAR MOTOR TO BURN OUT AND BEND THE RT GEAR RETRACT ROD PN 60-810057-617. THE MM CALLS OUT AN INSPECTION AND LUBRICATION OF THIS ROLLER EACH 100 HOURS OF OPERATION.