What was found
WHILE PERFORMING AN ENGINE RUN-UP/MAG CHECK, NR 5 CYLINDER ON THE RT ENGINE CRACKED/DISLOCATED AT THE INTERFACE AREA OF THE STEEL BARREL TOP AND ALUMINUM HEAD. THE ENGINE WAS SHUT DOWN AND RESULTANT LOCALIZED FIRE WAS CONTAINED TO THE IMMEDIATE AREA BY THE USE OF THE FIRE EXTINGUISHER. THE CYLINDER PRESENTED NO OBVIOUS FLAWS AT THE MOST RECENT INSPECTION. A POST INCIDENT INSPECTION OF THE AREA FOUND ENGINE BAFFLING INTACT AND CORRECTLY POSITIONED. IT IS SUSPECTED THAT A DEFECT IN THE CYLINDER REPAIR PROCESS (IE: WELDING) ALLOWED AN ABNORMAL STRESS CONCENTRATION TO CAUSE A FAILURE. THE CYLINDER WAS SENT BACK TO THE ENGINE REBUILDER FOR ANALYSIS. (K)