Statutory Documents - MCA Publications - LY3 - The Large Commercial Yacht Code - 11 Stability - 11.5 Stability Documents
11.5 Stability Documents
11.5.1 A vessel should be provided with a stability information booklet, for the Master, that is to be approved by the Administration.
11.5.2 The content, form and presentation of information contained in the stability information booklet should be based on the model booklet for the vessel type (motor or sailing) published by/for the Administration.
11.5.3 A vessel with previously approved stability information which undergoes a major conversion or alterations should be subjected to a complete reassessment of stability and provided with newly approved stability information.
A major refit or major alteration is one which results in either a change in the lightship weight of 2% and above and/or the longitudinal centre of gravity of 1% and above (measured from the aft perpendicular) and/or the calculated vertical centre of gravity rises by 0.25% and above (measured from the keel).
Additionally, unless it can be clearly demonstrated that no major change has occurred, a lightweight check should be carried out at the renewal survey required by 28.4.1.
11.5.4 Sailing vessels should have, readily available, a copy of the Curves of Maximum Steady Heel Angle to Prevent Downflooding in Squalls, or in the case of a multihull, the values of maximum advised mean apparent windspeed, for the reference of the watchkeeper. This should be a direct copy taken from that contained in the approved stability booklet.
11.5.5 The overall sail area and spar weights and dimensions should be as documented in the vessel's stability information booklet. Any rigging modifications that increase the overall sail area, or the weight/dimensions of the rig aloft, must be accompanied by an approved updating of the stability information booklet.
11.5.6 For Short Range Yachts, where the damage stability has not been assessed, the following note should be added to the approved stability booklet;
"This vessel has not been assessed for damage stability, and therefore might not remain afloat in the event of damage or flooding."
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