Originally Posted by jwhite9185

The flaps aren't usually set until after de-icing.

Theres also an electronic checklist on the display of the A320 series which will note anything in red that hasn't been set - such as auto brakes, spoilers armed (in case of an RTO). If the engines are powered up past a certain point and any of these points have been missed, it will trigger the master warning alarm.

Also, if you happen to land at an airport and the outside air temperature is over 100 degrees, the flaps won't be retracted fully after landing.