MGN 578 (M) Use of Equipment to Undertake Work Over the Side on Commercial Yachts, Small Commercial Vessels and Loadline Vessels (link)
This Marine Guidance Note provides guidance on the use of systems such as “rail and trolley” for undertaking overside work on vessels. These systems allow crew members to work outside conventional guardrails for cleaning and maintenance purposes on yachts and other vessels. There have been a number of accidents using substandard equipment of this type. In particular, it covers the requirement to ensure compliance with BS/EN standards and to ensure maintenance is carried out to the manufacturer’s advice.
Source: MCA