Safe winch operation and mooring-line hazards
What is being checked
The inspector is checking whether officers and ratings understand the real hazards created by winches and tensioned lines, and whether the physical controls support safe work. Painted snap-back zones are not enough. The team must understand that the danger area changes with line lead, load and failure mode.
Ready onboard
0/8 completePractice questions
Answer aloud, then open the preparation point.
1Show that this control lever returns to neutral when released.
Use the vessel’s approved procedures, records and fitted-equipment instructions. Demonstrate the evidence rather than giving only a general answer.
2Where would you stand while this line is heaving, and why?
Use the vessel’s approved procedures, records and fitted-equipment instructions. Demonstrate the evidence rather than giving only a general answer.
3How does the danger area change if the lead or load changes?
Use the vessel’s approved procedures, records and fitted-equipment instructions. Demonstrate the evidence rather than giving only a general answer.
4What would you do if communication with the bridge or station supervisor is lost?
Use the vessel’s approved procedures, records and fitted-equipment instructions. Demonstrate the evidence rather than giving only a general answer.
5Which stopper is approved for this line, and how do you know it is strong enough?
Use the vessel’s approved procedures, records and fitted-equipment instructions. Demonstrate the evidence rather than giving only a general answer.
6Why must a winch control never be tied or left operating unattended?
Use the vessel’s approved procedures, records and fitted-equipment instructions. Demonstrate the evidence rather than giving only a general answer.
Where an observation may arise
No usable procedure for safe work around winches and tensioned lines.
Officer or rating cannot explain snap-back, safe position or the vessel's communication method.
Lever does not return to neutral, direction marking is unclear, or controls show evidence of being secured for unmanned operation.
Operator cannot see the working area, access is obstructed or moving parts expose the operator.
Wrong stopper type, inadequate strength or unsafe application.
Barriers or warnings are absent where personnel can enter a hazardous area.
Master's practical note
Ask the crew about the line that is actually rigged, not about a diagram in the training room. A painted snap-back zone can create false confidence because the danger is not fixed to the deck. It changes with the lead, the point of failure and the energy in the line. The useful test is whether the team can identify the danger and a safe escape path for the mooring plan in front of them.
Equipment boundary and references
Equipment boundary: The core safety outcome is common. Control layout, clutch arrangement, brake type and stopper selection must be checked against the fitted equipment and company procedure.
References
- OCIMF Effective Mooring, Fourth Edition, sections 2 to 4
- ISM Code section 7
- Company mooring procedure and risk assessment
Last reviewed: 2026-08-11