Cause & Consequence
- Moving, flying or falling object
Incident Info Source
Specific Incident Equipment
Speaker assembly at the monkey board level.
When speaker was installed in the new derrick it was not secured with secondary retention.
The unsecured speaker had not been identified by third party derrick inspection as well as rig specific
The speaker wire housing / mounting post thread was cracked ¾ of the circumference but could not be
seen due to its location which was flush with the junction box.
The vibrations and shaking of the derrick from the dropped stand retrieval caused the speaker to shear
Immediately perform a full derrick inspection to ensure placement of secondary retention.
Develop derrick inspection / secondary retention training to cover proper use of secondary retention,
hands on / visual inspections, corrosion, hazard identification and temporary and permanent installations
in the derrick.
Conduct a full derrick inspection once derrick inspection / secondary retention training has been
Amend the “Derrick Access Log” to advise that all temporary or permanent equipment aloft is required to