What was found
FIVE MINUTES AFTER TAKEOFF, SMOKE CAME RUSHING INTO CABIN. NO ODOR WAS NOTICED. CREW TURNED OFF ALL BLEED AIR AND SMOKE STOPPED, BUT REMAINED IN CABIN. INSPECTED LT ENGINE AND FOUND OIL IN LP BLEED PORTS AND CARBON DEBRIS IN OIL FILTER. REMOVED LT ENGINE AND REPLACED WITH A SERVICEABLE RENTAL UNIT. ACCOMPLISHED GROUND RUNS OPS AND LEAK CHECKS WITH NO DEFECTS NOTED. ALL ENGINE PARAMETERS FOUND TO BE WITHIN LIMITS. WORK ACCOMPLISHED IAW MM 71-00-30, 71-00-20, 71-00-10 AND MM 71-00-00.