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B737 flight crew reported overshooting the cleared altitude during descent due to a failure to recognize a change in automation.
| Attributes | |
| ACN | 1585612 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | MDW.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Flight Phase | Initial Approach |
| Route In Use | SID GPS |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 402 |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 420 Flight Crew Type 9000 |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance Flight Deck / Cabin / Aircraft Event Other / Unknown Inflight Event / Encounter Weather / Turbulence |
Narrative:
It was the last flight of two-day to mdw. Cleared 3000 ft at sailz; cleared 22L; Y. First officer set lower altitude. I acknowledged. I looked down at ATIS for a second; looked up to find aircraft descending below 3000 ft before we hit sailz. LNAV was engaged but VNAV was not. I called out error. Pilot flying disconnected autopilot and corrected flight path back to 3000 ft. We landed uneventfully.
Original NASA ASRS Text
Title: B737 flight crew reported overshooting the cleared altitude during descent due to a failure to recognize a change in automation.
Narrative: It was the last flight of two-day to MDW. Cleared 3000 FT at SAILZ; cleared 22L; Y. First Officer set lower altitude. I acknowledged. I looked down at ATIS for a second; looked up to find aircraft descending below 3000 FT before we hit SAILZ. LNAV was engaged but VNAV was not. I called out error. Pilot Flying disconnected autopilot and corrected flight path back to 3000 FT. We landed uneventfully.
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.