Definition:Jettison
🌊 Jettison is the deliberate throwing overboard of cargo, equipment, or other property from a vessel in order to lighten it or stabilize it during an emergency at sea, and it constitutes one of the oldest recognized perils in marine insurance. The act must be intentional and carried out for the common safety of the voyage — distinguishing it from accidental loss overboard, which is covered as a separate peril. In insurance terms, jettison appears as a named peril in all three levels of the Institute Cargo Clauses and in the Institute Time Clauses — Hulls, reflecting its fundamental status in maritime risk.
⚖️ When goods are jettisoned, the resulting loss typically triggers a general average declaration, because the sacrifice is made voluntarily for the benefit of the entire maritime adventure. The GA adjuster values the jettisoned property and allocates a proportional contribution across all interests that were saved — the ship, the remaining cargo, and freight at risk. The owner of the jettisoned goods recovers from their own cargo insurer under the policy's jettison or GA provisions, while the owners of the saved cargo and the vessel fund their respective GA contributions, often through their own insurance policies. If no general average is declared — for example, because only the shipowner's own property was sacrificed — the loss may instead be treated as a particular average claim under the relevant hull or cargo policy.
🔑 Although modern shipping technology and vessel design have reduced the frequency of jettison compared to the age of sail, the peril retains practical importance. Container ships facing stability crises — whether from parametric rolling, cargo shift, or structural flooding — may still require the deliberate discharge of containers to prevent capsize or foundering. High-profile incidents involving the loss of thousands of containers at sea have underscored the continuing relevance of jettison provisions and their intersection with general average law. For underwriters and claims professionals, distinguishing between intentional jettison and accidental loss overboard (sometimes called "washing overboard") is a critical step in determining which policy provisions apply and how the loss is allocated across the marine insurance ecosystem.
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