Halfnut
For you Dash-8-Q400 guys;
Is there a way to monitor the output of the deicing system? If you had tear in one of the boots would you get any notification in the cockpit telling you a boot didn't inflate properly?
Yes there is, each boot has a relevant light on the Deice panel which illuminates each time the boot is inflated, it's always tested on the ground before departure. If, for instance, a boot isn't inflating because it's got an 'ole in it (Not uncommon) you will get a caution on the MWP (Can't remember what it says) and you'd probably see the relevant boot light flickering or not lighting up in the sequence.
Edit to add the Flap Assymetry protection will stop the flaps moving if there is more than 1 degree (?) difference between each flap.