ALBANY, NY, USA
N170RA
de Havilland DH-7-58C
THE ACFT EXPERIENCED AN UNCONTAINED DISINTEGRATION OF THE NO.2 ENGINE. SCORCHED ENGINE FRAGMENTS RIPPED THROUGH THE FUSELAGE INJURING TWO PASSENGERS, ONE SERIOUSLY. THE UNCONTAINED FAILURE WAS THE RESULT OF WEAR OR SPALLING OF THE 1ST STAGE REDUCTION GEAR AND THE SUN GEARS. PROGRESSIVE CONTAMINATION ALLOWED THE FAILURE TO PROGRESS TO THE ULTIMATE UNCONTAINED FAILURE. CONTRIBUTING TO THE ULTIMATE FAILURE WAS AN INOPERATIVE MAGNETIC CHIP DETECTOR PLUG, WHICH ALLOWED THE WEAR TO PROGRESS UNDETECTED.
Source: NTSB Aviation Accident Database
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