OSHA Accident Investigation · Summary #747808
MALCOLM DRILLING CO.
SO. SAN FRANCISCO, CA·
Event description
Employee killed when struck by mast
Investigation abstract
A mechanic, a welder, and the machine operator were removing the final drive ass embly from a mast on a drilling machine. The mast fell on Employee #1, killing h im. The employees had used only four bolts to hold the mast and drive assembly; there were supposed to be ten bolts holding the units together.
Victim
-
#1 Fatality Age 37 Male
- Nature of injury
- Fracture (12)
- Part of body
- SHOULDER (21)
- Accident type
- STRUCK BY (1)
- Source of injury
- MACHINE (26)
- Occupation
- Drillers, earth (598)
- Human factor
- MISJUDGMENT, HAZ. SITUATION (1)
- Environmental factor
- OVERHEAD MOVING/FALLING OBJ AC (6)
- Task assigned
- Task regularly assigned (1)
Labels are OSHA's own, from the code dictionary published with the accident-investigation file. The raw code is shown beside each one so this page can be reconciled against OSHA's bulk data. OSHA notes that nature of injury, part of body, source of injury and accident type in this file are not coded to the Occupational Injury and Illness Classification System, and that the occupation titles are not standardised — so these values are not directly comparable with the OIICS-coded severe injury reports.