What was found
IAH - FLT 1752 - AFTER TAKEOFF IAH WHILE CLIMBING THROUGH 5,500 FEET, CREW NOTICED A SEVERE VIBRATION THEN HEARD A NOISE. NR 2 ENGINE N1 DROPPED TO 48 PERCENT AND OIL TEMPERATURE WAS AT 130 DEGREES CELSIUS. RETARDED NR 2 THROTTLE AND FOLLOWED EMERGENCY ENGINE FAILURE/SHUTDOWN CHECKLIST. NR 1 CFR ADVISED NR 1 ENGINE WAS SMOKING AFTER LEAVING RUNWAY, BUT THEY FELT IT TO BE NORMAL. CREW SHUTDOWN NR 1 ENGINE ALSO. RETURNED AND LANDED IAH WITHOUT FURTHER INCIDENT. REPLACED NR 2 ENGINE. SYSTEM GROUND CHECKED, NORMAL OPERATION. A 1ST STAGE HPT BLADE FAILED AT THE AIRFOIL APPROXIMATELY 2 INCHES FROM THE ROOT. THE FRACTURE IS THE RESULT OF STRESS RUPTURE. (X)