Narrative:

Our day started with a wakeup for a [early flight]. I did not have anything to eat prior to departure due to the early hour. The first two legs went fine. After the first leg we were notified of an unscheduled aircraft swap. We executed the swap and departed approximately 21 minutes late. The captain offered me the opportunity to get something to eat; but due to the swap I elected to wait until we arrived at stl. On the arrival into stl we became aware that we were following a beechjet that was giving ATC some headaches. He was assigned .78 mach and later admitted to have been flying .72 mach. As a result we were slowed and given vectors off course during the descent. Once we were vectored to join the ILS we were told to slow to our final approach speed. I called for flaps 30 and we ran the before landing checklist. The autopilot and autothrottles were engaged and I was watching the beechjet fall within the 2.5 mile arc on the TCAS.ATC issued go-around instructions. They told us to turn right to a heading of 360 and maintain 3000 feet. I spun the heading knob to 360 and pressed heading select; but nothing happened. The aircraft remained in the approach mode. Rather than try and deselect approach; I disconnected the automation and manually turned the aircraft to 360. I then asked the captain to reset the flight directors and; when he could; to give me heading select and V/south of about 500 fpm climb back to 3000 feet. He complied and at that time prompted me; 'flaps 15?' 'positive rate?' that snapped me back into the green (or at least yellowish green). I realized that even though we were at 3000 feet; we were still fully configured and needed to execute a normal go-around. We finally began to clean up. The captain had to say 'getting a little slow' once as we transitioned from my botched missed approach to the standard missed approach profile. I don't believe we went below target; but we may have been between target and vref for a moment. Needless to say I was embarrassed and apologetic. I don't know why it didn't occur to me to just execute a normal missed approach. The captain asked if I knew the callouts/profile and I do. I can't explain why I didn't execute them as we are trained. Possible contributing factors: 1. Combination of being sleepy from the early wake up and the fact that I hadn't eaten anything. 2. The captain and I weren't really getting along very well. By the third day of the trip we were really just doing checklists and callouts and were not having any sort of cockpit conversation. I don't know if this could have impacted the way we were working together; but I suppose it's worth mentioning.

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Original NASA ASRS Text

Title: B737 First Officer reported incorrectly executing an ATC assigned missed approach due to being fatigued.

Narrative: Our day started with a wakeup for a [early flight]. I did not have anything to eat prior to departure due to the early hour. The first two legs went fine. After the first leg we were notified of an unscheduled aircraft swap. We executed the swap and departed approximately 21 minutes late. The Captain offered me the opportunity to get something to eat; but due to the swap I elected to wait until we arrived at STL. On the arrival into STL we became aware that we were following a Beechjet that was giving ATC some headaches. He was assigned .78 Mach and later admitted to have been flying .72 Mach. As a result we were slowed and given vectors off course during the descent. Once we were vectored to join the ILS we were told to slow to our final approach speed. I called for flaps 30 and we ran the Before Landing Checklist. The autopilot and autothrottles were engaged and I was watching the Beechjet fall within the 2.5 mile arc on the TCAS.ATC issued go-around instructions. They told us to turn right to a heading of 360 and maintain 3000 feet. I spun the heading knob to 360 and pressed HDG SELECT; but nothing happened. The aircraft remained in the approach mode. Rather than try and deselect approach; I disconnected the automation and manually turned the aircraft to 360. I then asked the Captain to reset the flight directors and; when he could; to give me HDG SELECT and V/S of about 500 fpm climb back to 3000 feet. He complied and at that time prompted me; 'Flaps 15?' 'Positive rate?' That snapped me back into the Green (or at least Yellowish Green). I realized that even though we were at 3000 feet; we were still fully configured and needed to execute a normal go-around. We finally began to clean up. The Captain had to say 'getting a little slow' once as we transitioned from my botched missed approach to the standard missed approach profile. I don't believe we went below target; but we may have been between target and VREF for a moment. Needless to say I was embarrassed and apologetic. I don't know why it didn't occur to me to just execute a normal missed approach. The Captain asked if I knew the callouts/profile and I do. I can't explain why I didn't execute them as we are trained. Possible contributing factors: 1. Combination of being sleepy from the early wake up and the fact that I hadn't eaten anything. 2. The Captain and I weren't really getting along very well. By the third day of the trip we were really just doing checklists and callouts and were not having any sort of cockpit conversation. I don't know if this could have impacted the way we were working together; but I suppose it's worth mentioning.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.