Of course it was the pilots fault for not setting the flaps for take off. They got set up by maintenance when they disabled the take off warning horn system. The R5 relay had several functions, one was take off warning, the other was the temp probe. They disabled both. It happened to me one night but as I said on an earlier post didn't realize it disabled my take off warning system also. Yes, I did set my flaps even though the warning system was inop.