What was found
EN ROUTE FROM CLT TO PNS, FLIGHT CREW HEARD A CLUNKING SOUND WHEN ATTEMPTING TO USE STABILIZER TRIM. AFTER A FEW MORE ATTEMPTS TO USE THE NORMAL STABILIZER TRIM, IT FROZE UP AT FL280. MANUAL TRIM WAS UTILIZED, AND IT WAS DECIDED THAT A LONGER RUNWAY WOULD BE NEEDED FOR A 15 DEGREE FLAPS LANDING. CREW DECLARED AN EMERGENCY AND DIVERTED TO MCO AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE STABILIZER CONTROL CABLE DRUM CHAIN TENSION HIGH. ADJUSTED TENSION PER MM 27-41-41-824. CLEANED AND LUBRICATED CHAIN. OPERATED SMOOTHLY AT THIS TIME. (M)