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B737-700 first officer reports selecting a lower altitude on the MCP prior to the FAF and glideslope intercept resulting in descent below the glidepath. The captain takes note and the reporter takes corrective action. Fatigue was cited as the main factor involved.
| Attributes | |
| ACN | 1159490 |
| Time | |
| Date | 201403 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ATL.Airport |
| State Reference | GA |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | MCP |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
During the ILS to 26L; for whatever reason I reset the alt select prior to capturing the glideslope and began following a false slope below the FAF. The captain quickly caught my mistake and I disconnected the autopilot; leveled off and re-intercepted the proper glide path. I didn't realize how tired I was on this red eye until I made such a mistake. Although we had visual contact with airport at all times it was still a breach of procedure. We landed without incident. I followed the fatigue mitigation procedures including caffeine 30 minutes prior to landing but fatigue played a key role in my mistake.
Original NASA ASRS Text
Title: B737-700 First Officer reports selecting a lower altitude on the MCP prior to the FAF and glideslope intercept resulting in descent below the glidepath. The Captain takes note and the reporter takes corrective action. Fatigue was cited as the main factor involved.
Narrative: During the ILS to 26L; for whatever reason I reset the Alt Select prior to capturing the glideslope and began following a false slope below the FAF. The Captain quickly caught my mistake and I disconnected the autopilot; leveled off and re-intercepted the proper glide path. I didn't realize how tired I was on this red eye until I made such a mistake. Although we had visual contact with airport at all times it was still a breach of procedure. We landed without incident. I followed the fatigue mitigation procedures including caffeine 30 minutes prior to landing but fatigue played a key role in my mistake.
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.