Good evening -
I have a question from a flight I recently took: I was on the first flight out of DFW to ORD at 05:45 Monday morning. It had rained a lot through the weekend and overnight Sunday. While we were taxiing towards the active, I'll say roughly 3000 ft short of lining up, the pilot throttled up each engine separately for 15-30 seconds. When I say throttled up, it was way beyond taxi power and you could feel him applying the brakes to keep it from accelerating too much...like borderline takeoff power. He did this for each engine by itself and we picked up a fair amount of speed going down the taxiway.
Question I have is this a standard operating procedure after the plane's sat on the ground to make sure all the water's flushed out of the engine on the first flight of the day or is there another reason why the pilot would have done this?