|Quoting Starlionblue (Reply 1):|
They can be important, but would they really make THAT much of a diff over the whole length of the roll-out? I don't know.
Assuming the -146 has typical upper-wing-surface spoilers (in addition to the split cone airbrake), then they can make a significant difference, especially given slippery conditions. The spoilers dump the lift, putting more weight on the wheels, which gives the wheels increased traction (not to mention, they also add more drag). Hence, no spoilers = reduced traction = increased chance of hydroplaning/skidding.
1400 meters =~ 4600 feet. Assuming touchdown at 1000', you have 3600' in which to stop. I'd imagine it would not be farfetched to have an overrun in the case of some serious hydroplaning.
But I'll leave it to the pilots to confirm/critique (pretty sure we have an ex -146 pilot in here...)
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