Alert 07 – 29 Personnel Hoist Stuck in “Hoist” Position
WHAT HAPPENED:
During operations to slip and cut drilling line, crewman was being hoisted on a Personnel Hoist to remove a dead man centralizer on the drilling line. The directional control handle on the Personnel Hoist became detached causing a loss of control of the winch in the hoisting mode. To prevent further uncontrolled ascent, the air isolation valve was closed, shutting off the air supply to the winch. The control handle was reinstalled and operations resumed.