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Triple5 – Design Requirements:
The development of the Triple5 hook began with a set of fourteen design requirements and one key primary design feature.

Primary Design Requirements: | more detail | Off-Load Safety with On-Load Functionality Based on SSI’s Current Hook (25 Year Safe History) The Weight of the Boat Holds the Hook Closed The Weight of Boat is Not Used to Open the Hook in On-load Release Inherently Stable Hook: meets “Fail to Safe” Criteria Primary Design Feature – Load Over Center  | more detail | Secondary Design Requirements  | more detail | No Critical “Wear Areas” that Lead to Inadvertent Hook Release or Reduce Component Life No Coils or Springs to Fail or Loose Tension No Fine Tolerances Operator Interface Requirements:  | more detail | Regular Operation Release Handle Cannot Release Under Load Distinctly Different Release Method for On-Load Release Multiple Deliberate Actions to Release On-Load Hook is either Open Or Closed, Cannot be Partly Open or Closed Maintenance Interface Requirements:  | more detail | Incorrect Cable Adjustment Cannot Lead to Catastrophic Failure Cannot be Assembled Incorrectly after Maintenance