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A fatigued B747 captain reported crossing the runway threshold low during a night approach in moderated rain and winds.
| Attributes | |
| ACN | 1232801 |
| Time | |
| Date | 201501 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Landing |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 21000 Flight Crew Type 4000 |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Inflight Event / Encounter Weather / Turbulence Inflight Event / Encounter CFTT / CFIT |
Narrative:
Weather during our approach and landing was night; moderate rain; moderate crosswind; and visibility about 2 miles. Disconnected autopilot at about 500 feet; and was lined up well on the runway centerline. Possibly due to fatigue; allowed profile to be less than desired. Was making correction at about the same time as the activation of the GPWS warning; 'too low.' I landed the aircraft at after a normal flare. Threshold minimum crossing height is 42 feet for the 747. We debriefed the approach after we landed; and also after block in. It is estimated that we descended through 50 feet just prior to the threshold; and estimate that the actual threshold crossing was about 40 feet; or 2 feet less than minimum. This was a learning experience; and I feel that we should report these occurrences. I will know to guard against this type of 'low on the glidepath' approach and landing in the future.
Original NASA ASRS Text
Title: A fatigued B747 Captain reported crossing the runway threshold low during a night approach in moderated rain and winds.
Narrative: Weather during our approach and landing was night; moderate rain; moderate crosswind; and visibility about 2 miles. Disconnected autopilot at about 500 feet; and was lined up well on the runway centerline. Possibly due to fatigue; allowed profile to be less than desired. Was making correction at about the same time as the activation of the GPWS warning; 'Too Low.' I landed the aircraft at after a normal flare. Threshold minimum crossing height is 42 feet for the 747. We debriefed the approach after we landed; and also after block in. It is estimated that we descended through 50 feet just prior to the threshold; and estimate that the actual threshold crossing was about 40 feet; or 2 feet less than minimum. This was a learning experience; and I feel that we should report these occurrences. I will know to guard against this type of 'low on the glidepath' approach and landing in the future.
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.