What was found
DURING EMMA CHECK, THE NR 1 FUEL SYSTEM STRAINER WAS FOUND TO BE HEAVILY CONTAMINATED WITH A FINE, GRITTY SUBSTANCE THAT STAYED SUSPENDED IN THE FUEL. FUEL TANKS AND DRAINS WERE FOUND TO BE CLEAR. FURTHER INVESTIGATION REVEALED THAT THE OUT PUT FROM THE NR 1 BOOST PUMP WAS SIGNIFICANTLY LOWER THAN NR 2 PUMP. WHEN A MAGNET WAS INTRODUCED TO THE CONTAMINATED FUEL, THE CONTAMINANT ATTACHED ITSELF TO THE MAGNET. THE BOOST PUMP WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE WITH NO RECURRENCE OF THE CONTAMINATION IN THE FUEL STRAINER.