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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 14549695 - Orchard Crane "Two-Blocked", Block Fell, Striking Employees

Accident: 14549695 -- Report ID: 0454714 -- Event Date: 09/14/1984
InspectionOpen DateSICEstablishment Name
1515575709/18/19843334Alcoa Inc
EMPLOYEES #1 AND #2 WERE PART OF A FIVE MAN CREW WHICH WAS CHANGING AN 18 INCH FEED ROLL IN AN ALUMINUM RECYCLING BUILDING. THE TWO EMPLOYEES WERE IN THE BASKET OF A HYDRAULIC WORK PLATFORM WHICH WAS SUSPENDED ABOUT 12 FEET ABOVE FLOOR LEVEL. EMPLOYEE #2 WAS OPERATING THE CRANE BY RADIO CONTROL. THERE WAS NO LOAD ON THE CRANE. WITH THE CRANE BLOCK DIRECTLY ABOVE THE BASKET, EMPLOYEE #2 RAISED THE BLOCK AT FULL SPEED. THE BLOCK, WHICH HAD A DAMAGED TRIPPAN (BENT APPROXIMATELY 10 DEGREES BELOW HORIZONTAL) CONTACTED THE COUNTERWEIGHT FOR THE LIMIT SWITCH. THE LIMIT SWITCH COUNTERWEIGHT SLID OFF THE BENT TRIPPAN, PARTIALLY DUE TO A BROKEN COUNTERWEIGHT "HAIRPIN", WHICH FAILED TO LIMIT THE HORIZONTAL MOVEMENT OF THE COUNTERWEIGHT. THE BLOCK CONTINUED UPWARD, CONTACTING THE DRUM. THE WIRE ROPE BROKE, ALLOWING THE 700 POUND BLOCK/HOOK TO FALL INTO THE BASKET CONTAINING EMPLOYEES #1 AND #2. EMPLOYEE #1 RECEIVED CRITICAL INJURIES. EMPLOYEE #2 RECEIVED MINOR INJURIES. SUBSEQUENT INVESTIGATION REVEALED POOR CRANE MAINTENANCE, INADEQUATE TRAINING OF PREVENTATIVE MAINTENANCE PERSONNEL, UNSAFE WORK PRACTICES AND INADEQUATE RECORD KEEPING PROCEDURES.
Keywords: maintenance, crane hook, wire rope, overhead crane, struck by, two-blocking, crane block, falling object, crane
Employee # Inspection Age Sex Degree Nature Occupation
1 15155757 Hospitalized injury Fracture Industrial machinery repairers
2 15155757 Non Hospitalized injury Cut/Laceration Industrial machinery repairers

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