At least in the case of intec/fintec actually they would. If you visually ensure the pins are engaged, the binding is basically fail-safe. The only way out is to pull the cable, or physically depress the pins. That is to say short of your toe or heel block moving the centimetre to allow the toe bail to clear the toe ledge of your boot, your toe can't come out of the binding. And even in the unlikely event of that failure your heel is still held captive by the pins.
Originally Posted by KingCrimson
In the case of Fintecs specifically the shell of the heel, or the steel heel receiver would have to physically break to allow the pins to break free, or you'd have to rip all four screws of the heel retaining screws out of the t-nuts in your boot. If any of these occurred I think the violence of the wipe out would ensure that you had other more serious injuries to worry about.
In fact the fintec/intec heel mechanism is fail safe in that the pins in the heel are spring-loaded such that additional pressure has to be put on them to make them retract. Therefore a failure of the internal heel mechanism leaves you locked into the binding, requiring the use of ski poles to depress the pins and get out (happened to me once). I suspect an internal spring could break and this could cause a release, but I have yet to hear of this failure mode occuring. Anyways the springs aren't cycled excessively so metal fatigue isn't likely to occur on this sub-component.
I bolded if above because it is quite possible with TD3s and Fintecs (or other step-ins) to have snow build up under the heel of your boot, or on the toe block of the binding, which prevents the pins from fully engaging, this can result in "premature ejectulation" as you load the binding up in a turn. As this has happened to me twice now I visually make sure the pins are engaged every time I step-in. I really wish Fin would anodize the Fintec heel pins in red or some other colour so they easily stood out from the heel receiver once engaged.
Since I've started visually checking the pins after stepping in I have yet to have a binding release.
Last edited by Puddy Tat; January 24th, 2012 at 08:54 AM.
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