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A B737-700 captain reported getting a low altitude alert from mdw tower following an unstable approach. Reporter mentioned fatigue as a factor.
| Attributes | |
| ACN | 977514 |
| Time | |
| Date | 201110 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | MDW.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT Inflight Event / Encounter Unstabilized Approach |
Narrative:
Doing the ILS 31C circle to land 22L at midway; descending through light to moderate icing; maneuvering around weather (cells); as always; chicago kept us high for as long as possible. I [loaded] the approach in the FMS; autopilot on. We were high and fast; I dropped gear and put out flaps and speed brake; and the auto pilot blew right through the marker altitude (hobel at 1;700). I clicked off autopilot and leveled; lost 300 ft. Tower told us they had a low altitude alert. Came back to 1;700; then flew the pattern for 22L; made wide turn but was stable and able to make the runway. Don't over rely on automation; stay ahead of airplane and intervene when needed; cdos (continuous duty overnights) should have a minimum of nine hours between flights (this stand up has an average time in hotel room of four hours); monitor self and be sure of total sleep each day.
Original NASA ASRS Text
Title: A B737-700 Captain reported getting a low altitude alert from MDW Tower following an unstable approach. Reporter mentioned fatigue as a factor.
Narrative: Doing the ILS 31C circle to land 22L at Midway; descending through light to moderate icing; maneuvering around weather (cells); as always; Chicago kept us high for as long as possible. I [loaded] the approach in the FMS; autopilot on. We were high and fast; I dropped gear and put out flaps and speed brake; and the auto pilot blew right through the Marker Altitude (HOBEL at 1;700). I clicked off autopilot and leveled; lost 300 FT. Tower told us they had a low altitude alert. Came back to 1;700; then flew the pattern for 22L; made wide turn but was stable and able to make the runway. Don't over rely on automation; stay ahead of airplane and intervene when needed; CDOs (Continuous Duty Overnights) should have a minimum of nine hours between flights (this stand up has an average time in hotel room of four hours); monitor self and be sure of total sleep each day.
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.