What was found
ON FLIGHT 2944 DURING TAKEOFF THE CREW REPORTED, RECEIVED A NR 1 HYDRAULIC PUMP FAIL EICAS MESSAGE AT GEAR RETRACTION. THE CAPTAIN ELECTED TO RETURN TO MAF. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED NR 1 HYDRAULIC PUMP IAW EMB 145 AMM 29-10-04 LEAK CHECK OK AT THIS TIME. PART NUMBER 971808. SERIAL NUMBER MX600080. REMOVED AND REPLACED NR 1 HYDRAULIC ELECTRIC MOTOR DRIVEN PUMP IAW EMB 145 AMM 29-10-03. PART NUMBER MPEV30086. SERIAL NUMBER MX642084. LEAK CHECK GOOD AT THIS TIME. REMOVED AND REPLACED HYDRAULIC LINES AT LMLG ACTUATOR IAW EMB 145 AMM 32-10-01. LEAK CHECK GOOD AT THIS TIME. SYS BLEED C/W IAW AMM 29-10-00. REMOVED AND REPLACED HYDRAULIC LINES AT LMLG ACTUATOR IAW EMB 145 AMM 32-10-01, LEAK CHECK GOOD AT THIS TIME. SYS BLEED C/W IAW AMM 29-10-00. REMOVED AND REPLACED NR 1 HYDRAULIC SYSTEM PRESSURE, CASE AND RETURN FILTERS IAW EMB 145 AMM 29-10-08. NO CONTAMINATION FOUND. THE LEAK CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.