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Late at night a tired B737-400 flight crew descended 600 feet below the FAF altitude due to following a false GS indication.
| Attributes | |
| ACN | 858669 |
| Time | |
| Date | 200911 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
We were being vectored for a visual approach. The weather was VFR with ceilings 3200' broken; visibility greater than 10 miles and light winds from the north. Approach cleared us to turn final outside the FAF and to contact tower. The ILS frequency was tuned. I made a 90 degree left turn toward the runway. Approximately 2 miles outside the FAF; I descended to 600' below the FAF crossing altitude on what appeared to be a false glide slope indication. The captain noted the indication and the altitude. Corrective action was immediately taken to the normal glide path. The aircraft landed uneventfully. Contributing factors were associated with a long day and late night operations.
Original NASA ASRS Text
Title: Late at night a tired B737-400 flight crew descended 600 feet below the FAF altitude due to following a false GS indication.
Narrative: We were being vectored for a visual approach. The weather was VFR with ceilings 3200' broken; visibility greater than 10 miles and light winds from the north. Approach cleared us to turn final outside the FAF and to contact tower. The ILS frequency was tuned. I made a 90 degree left turn toward the runway. Approximately 2 miles outside the FAF; I descended to 600' below the FAF crossing altitude on what appeared to be a false glide slope indication. The Captain noted the indication and the altitude. Corrective action was immediately taken to the normal glide path. The aircraft landed uneventfully. Contributing factors were associated with a long day and late night operations.
Data retrieved from NASA's ASRS site as of April 2012 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.