What was found
MIA - FLT 321 - AFTER TAKEOFF OF FLIGHT, THE LANDING GEAR DID NOT GO UP WHEN RAISED. THE AIRCRAFT RETURNED TO DEPARTURE AIRPORT FOR MAINTENANCE, LANDING WAS NORMAL. T/S WAS PERFORMED AS PER AMM 32-09-200 PAGE 501, ADJUSTED GROUND SAFETY SWITCH, AIRCRAFT JACKED AND PERFORMED SEVERAL LANDING GEAR EXTENSIONS/RETRACTIONS AS PER AMM 32-32-0, OPERATION WAS NORMAL. THE PROPER SYSTEM OPERATION WAS VERIFIED DURING 'NONREVENUE' FLIGHT. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)