Davit proof-load testing is required whenever the system must prove structural and brake capacity to class/flag, not just function. Typical triggers:
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New installation/relocation or commissioning after shipyard work.
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Major repair/alteration: arm/foundation welds, winch or brake replacement/overhaul, sheaves/bearings change, falls/wire renewal, gearbox or motor change, structural damage.
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After overload/incident or suspected deformation.
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Five-year cycle within the MSC.402(96) thorough examination, where maker/class requires a dynamic proof.
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On request by class/flag/PSC, or before hand-over/sale.
Method (evidence the capacity): apply proof load = 110% SWL using certified water bags or calibrated deadweights; read with load cells/dynamometers; hold to acceptance time, then return to SWL for a functional run (lower/hoist, emergency stop, brake holding). Record hook/arm deflection, winch behavior, brake temperature, current draw, interlock status. Restore maker settings, inspect post-test, and document. Deliver a class-ready evidence pack: signed load-test sheets, calibration certificates, photos, and witness note when class attends.
Planning & safety: for davit proof-load testing, pre-book certified load kits and, when required, class attendance; confirm quay/yard access, lifting points, and safe water area for bag filling. Agree abort criteria; set permit-to-work, toolbox talk and an exclusion zone. We can combine proof-load with release-gear checks and 110% SWL brake holding to finish in one visit and minimize idle time.
Action:
Book 2–3 slots that match ETA/ETD; share gate contact, passes and PPE; note if water-borne filling or launch is needed at anchorage.
Docs:
SOLAS III/20 (operational readiness, maintenance, records);
IMO MSC.402(96) (maintenance, thorough examination, testing, overhaul and repair of LSA).
See:/services/lsa/davit-load-test/ · /services/lsa/ · /documents/