What was found
ORD - FLT 1442 - SHORTLY AFTER TAKEOFF, THE NR 1 ENGINE LOST OIL PRESSURE AND OIL QUANTITY AT 1000 FEET AGL, APPROX 2 MINUTES AFTER IDENTIFYING AND RUNNING CHECKLISTS NR 1 ENGINE WAS SHUTDOWN NR 1 HAD 0 OIL QTY AT SHUTDOWN AND HAD BEEN AT IDLE POWER FOR MORE THAN 1 MINUTE, OIL PRESSURE WAS AT APPROX ZERO ENGINE WAS AT WINDMILLING SPEED FOR ABOUT 4-5 MINUTES. REMOVED AND REPLACED ENGINE LEFT SIDE IAW SPIRIT AIRLINES TASK CARD 00191. LEAK AND OPS CHECK GOOD. (M)