Wrong flaps setting on take-off
I believe this is something that happened to many people flying short multiple sectors per day, where complacency is such a bad habit.
We were on the fourth and final sector of a long duty, in a hot summer day. For those flying the A320 they should know that it is standard to have flaps 1 on ground when temperature is above 30 degrees. Doing many short sectors in the area, it sometimes becomes a new “flow” not to even touch the flap lever on the after-start flow.
So, for a change, this departure required a flaps 2 setting on take-off. But during our take-off calculation even though we had the correct results we didn’t give the proper attention to the different setting. Our SOPs dictate that we do last minute calculation after final load shit is received to have the most efficient take off results possible. Many factors, like the heat, the exhaustion, the complacency, short turn-around time and even the rush to get back home, are a few of the distractions and threats we were dealing with. On top of that we had another distraction, as we had a visitor on the flight deck who would travel on the jumpseat (company personnel).
We missed the new setting in the after start, we missed the incorrect setting in the confirmation briefing and the take-off was done with the wrong flap setting! Luckily for us it didn’t result to any abnormal situation and everything worked out in the end. I only realised the mistake when during the climb out, our target speed was inside the VLS band, but we had already started out acceleration at that point so it didn’t make any difference.