What was found
ON FLIGHT 9808 THE CREW REPORTED THAT DURING LANDING GEAR EXTENSION THEY HEARD A BANG NOSE AND THE GEAR FAILED TO EXTEND FOLLOWED BY AN EICAS LG/LEVER DISAGREE MESSAGE. THE CREW COMPLIED WITH AOM PROCEDURES AND DECLARED AN EMERGENCY. THE GEAR EXTENSION ON THE SECOND ATTEMPT WAS GOOD. THE AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED THE SYSTEM 1 LOWER RETRACTION FLEXIBLE AND SOLID LINE IAW EMB 145 AMM 20-10-03. PERFORMED EXTENSION AND RETRACTION ADJUSTMENT TEST AND LANDING GEAR ADJUSTMENT TEST IAW EMB 145 AMM 32-30-00 AND 32-34-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.