Narrative:

This was an all-nighter with a hotel pick-up time several hours before midnight. I had planned an afternoon nap; but being a night owl and having slept fairly well the night before; was not able to get any sleep. Flight went fine; ate lightly; but started to feel quite tired about 1 hour from landing. Consumed a coffee drink at that point in an attempt to be alert.briefed the planned approach and go-around procedure as per SOP. The ATIS weather was light snow with possible strong crosswinds (030@14 gusts to 24) so planned flaps 25 and auto brakes level 4. ATC communications were busy and we were vectored to approximately a 12 mile final. We were told to keep our speed up (170 kts) to the final fix. At that point we had the gear down and flaps 20. The tower was very busy and the captain was trying to get a landing clearance. I asked for flaps 25 but apparently was too tired to note that he didn't hear me and did not move the flap handle. At 500 feet; I finally noticed the flaps were still at 20; and again asked for 25.what I should have done was go-around!!! In our fatigue; the captain and I were both so focused on landing that neither of us thought or vocalized that we were outside of the definition of a stabilized approach. Yes; the plane was in final configuration and at the proper speed for landing; but not until below 500 feet. I can't believe after years of reading the quality assurance reports and thinking how could a pilot do something so stupid; now I understand. I have met the moron and he is me!

Related reports:

Google
 

Original NASA ASRS Text

Title: A fatigued B777 crew failed to execute a missed approach when they discovered flaps 25 were not set at 600 feet AGL. Flaps 25 were set for landing.

Narrative: This was an all-nighter with a hotel pick-up time several hours before midnight. I had planned an afternoon nap; but being a night owl and having slept fairly well the night before; was not able to get any sleep. Flight went fine; ate lightly; but started to feel quite tired about 1 hour from landing. Consumed a coffee drink at that point in an attempt to be alert.Briefed the planned approach and go-around procedure as per SOP. The ATIS weather was light snow with possible strong crosswinds (030@14 Gusts to 24) so planned Flaps 25 and auto brakes level 4. ATC communications were busy and we were vectored to approximately a 12 mile final. We were told to keep our speed up (170 kts) to the final fix. At that point we had the gear down and Flaps 20. The Tower was very busy and the Captain was trying to get a landing clearance. I asked for Flaps 25 but apparently was too tired to note that he didn't hear me and did not move the Flap handle. At 500 feet; I finally noticed the flaps were still at 20; and again asked for 25.What I should have done was GO-AROUND!!! In our fatigue; the Captain and I were both so focused on landing that neither of us thought or vocalized that we were outside of the definition of a stabilized approach. Yes; the plane was in final configuration and at the proper speed for landing; but not until below 500 feet. I can't believe after years of reading the Quality Assurance reports and thinking how could a pilot do something so stupid; now I understand. I have met the moron and he is ME!

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.