NTSB Identification: NYC92LA011.
The docket is stored on NTSB microfiche number 45603.
Accident occurred Sunday, October 20, 1991 in ALBANY, NY
Probable Cause Approval Date: 04/27/1993
Aircraft: AEROSPATIALE ND-26, registration: N29816
Injuries: 3 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
A PROPELLER BLADE FAILED DURING TAKEOFF AND ENTERED THE FUSELAGE. THE CREW ABORTED THE TAKEOFF SUCCESSFULLY. METALLURGICAL EXAMINATION REVEALED THAT THE BLADE FAILED AS A RESULT OF 'MULTIPLE FATIGUE CRACK ORIGINS (WHICH) HAD EMANATED FROM CORROSION PITS ON THE BLADE BORE SURFACE.' THE BLADE BORE WAS SUPPOSED TO BE COATED WITH A CHROMATE CONVERSION TO INHIBIT CORROSION. ENERGY DISPERSIVE X-RAY SPECTROGRAPH (EDS) REVEALED NO EVIDENCE THAT THE CHROMATE CONVERSION COATING HAD BEEN ACCOMPLISHED.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: INADEQUATE QUALITY CONTROL DURING MAINTENANCE OR MANUFACTURING BY FAILING TO USE CORROSION INHIBITER, WHICH RESULTED IN CORROSION, FATIGUE, AND SUBSEQUENT FAILURE.
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