COMPTON, CA, USA
N6972C
NORTH AMERICAN AT-6
AT THE BEGINNING OF A LOCAL PLEASURE FLIGHT, JUST AFTER TAKEOFF, THE ENGINE EXPERIENCED A LOSS OF POWER. WIRES WERE STRUCK DURING A FORCED LANDING ON A RESIDENTIAL STREET. INSPECTION OF THE ENGINE REVEALED THAT THE NUMBER FIVE CYLINDER WAS CRACKED IN TWO PARTS. A METALLURGICAL EXAMINATION REVEALED THAT THREE SEPARATE FATIGUE CRACKS EXISTED PRIOR TO THE FINAL BREAK. COMBUSTION BY-PRODUCTS WERE NOTED IN THE CRACKS AND ON THE OUTSIDE OF THE CYLINDER IN THE AREA OF THE CRACKS.
FATIGUE CRACKS THAT EXISTED IN AN ENGINE CYLINDER.
Source: NTSB Aviation Accident Database
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