Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 177; Flight Crew Total 2290; Flight Crew Type 388
Situational Awareness; Fatigue; Human-Machine Interface
Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Unstabilized Approach
Flight Crew Executed Go Around / Missed Approach
Weather; Human Factors
We were on a RNAV Approach at ZZZZ. We were given vectors and an altitude for the approach. Just before the FAF I checked and the VAPP was armed; but I forgot to deselect the 'ALT SEL' mode. We made the airplane level off at the selected altitude (probably 5000 ft). With this our vertical guidance turned off; so when I noticed it I called for the go around. During the go around I forgot to push the TO/GA button. I've made the required calls for the go around; but the airplane didn't initiate a climb (because the TO/GA haven't been pushed). Because of that the airplane accelerated fast; so the Captain called me to check on the airspeed that was going fast toward the max structural airspeed; that was the time we noticed that the flaps were still at the 10 position. By that time we had oversped the flaps by 47 knots. After that we got vectors to another approach that happened without problems. It was a 3 day pairing that started with PM flights on the first two days and on the last day we had a [early morning] shuttle time. I went to bed; but couldn't fall asleep until passed midnight. I woke up after a bad night of sleep. I had woke up 4 times that night. So I believe fatigue was definitely a factor.
Air carrier First Officer reported an incorrect go-around profile due to failure to arm the approach.