I've heard that it can also be set on the 737 ,and it won't be possible to set it off again.
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I've heard one cpt did it,and it had to declare an emergency before landing,thinking that the tyres will blow at contact. To his luck,it seems that Boeing thought about such smart,playfull pilots,and the parking brake disabled itself at touchdown,normal braking after that.
Expatula,why would you set parking brake inflight? Well,what if you have to wait at a crossings,for the train to pass? .We even shutdown the engines,it's standard SOP,just to save fuel..
