Narrative:

Was PF on last leg of four-day. This final day was flown with different captain than previous three days. I had flown with the captain numerous times before and had an excellent working (personal and coordination) relationship. The four-day trip was a higher than average duty hour four-day trip with the last two days of the trip requiring early predawn wake ups. The last day was the longest at near 11-hour duty day. In addition; after landing on the final leg; I would be immediately non-revving to XXX; to fly a two-day trip starting the next day. The three previous legs were uneventful; with only a slight delay at the beginning of the third leg due to a very minor line maintenance repair (tightening a screw). Weather was only a minor factor on only the last leg requiring minor avoidance deviations enroute. The arrival and approach brief was accomplished in accordance with company policies and procedures. A visual approach was briefed for xxl. Abeam the approach end of xxl; we were cleared the visual to xxl and to maintain visual separation on aircraft ahead of us to xxl and one on xxr. Configuration went normal through landing gear down and flaps 15. Rolling onto final; PF focused on not overshooting and PF kept lookout for aircraft on [the parallel]. But due to extra tasking; visual lookout and ensuring not to overshoot and cumulative effect of early wake ups and long last day; crew communication broke down as call for final landing flaps by PF was not clearly stated nor was it verified; as PF got behind. PF got tunnel vision and began focusing on unusual power settings and associated airspeed. This caused both pilots to narrow their focus. Neither called for landing checklist. At 600' AGL the PF felt something was incorrect and started to state going around. At that moment the GPWS call too low flaps occurred. PF stated going around and a missed approach was executed followed by a normal visual approach and landing. Ensure don't get complacent following company prescribed policy and procedures. Also communicate to crew member to keep a keen watch if you have done consecutive early wake ups which may catch up with you especially on last long day of a four-day trip; i.e.; providing them a verbal mental picture of how you're doing!

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Original NASA ASRS Text

Title: A fatigued B737 crew failed to recognize landing flaps were not set at 600 feet AGL. Consequently; the EGPWS TOO LOW FLAPS alerted so the First Officer executed a go-around; configured correctly; and returned for uneventful landing.

Narrative: Was PF on last leg of four-day. This final day was flown with different Captain than previous three days. I had flown with the Captain numerous times before and had an excellent working (personal and coordination) relationship. The four-day trip was a higher than average duty hour four-day trip with the last two days of the trip requiring early predawn wake ups. The last day was the longest at near 11-hour duty day. In addition; after landing on the final leg; I would be immediately non-revving to XXX; to fly a two-day trip starting the next day. The three previous legs were uneventful; with only a slight delay at the beginning of the third leg due to a very minor line Maintenance repair (tightening a screw). Weather was only a minor factor on only the last leg requiring minor avoidance deviations enroute. The arrival and approach brief was accomplished in accordance with Company policies and procedures. A visual approach was briefed for XXL. Abeam the approach end of XXL; we were cleared the visual to XXL and to maintain visual separation on aircraft ahead of us to XXL and one on XXR. Configuration went normal through landing gear down and flaps 15. Rolling onto final; PF focused on not overshooting and PF kept lookout for aircraft on [the parallel]. But due to extra tasking; visual lookout and ensuring not to overshoot and cumulative effect of early wake ups and long last day; Crew communication broke down as call for final landing flaps by PF was not clearly stated nor was it verified; as PF got behind. PF got tunnel vision and began focusing on unusual power settings and associated airspeed. This caused both Pilots to narrow their focus. Neither called for Landing Checklist. At 600' AGL the PF felt something was incorrect and started to state going around. At that moment the GPWS call Too Low Flaps occurred. PF stated going around and a missed approach was executed followed by a normal visual approach and landing. Ensure don't get complacent following Company prescribed policy and procedures. Also communicate to Crew Member to keep a keen watch if you have done consecutive early wake ups which may catch up with you especially on last long day of a four-day trip; i.e.; providing them a verbal mental picture of how you're doing!

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.