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B737 flight crew reported overshooting an altitude on descent after a discontinuity in the approach disconnected the autopilot.
| Attributes | |
| ACN | 1522168 |
| Time | |
| Date | 201802 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 2948 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Type 9000 |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
While in LNAV/VNAV on descent pilot monitoring reentered ILS approaching zzzzz in order to extend the ILS to ZZZZZ1. Got message unable due to altitude constraint. He deleted a couple points and executed as we passed zzzzz. I announced cws (control wheel steering) in both lateral and vertical and realized we needed to descend to 6000 ft at ZZZZZ2. I began the descent thinking I had disconnected the autopilot but was still in cws. As we approached 6000 ft; I realized I had not disconnected the autopilot and the stick forces were substantial as I missed the level off altitude. I clicked off the autopilot and corrected back to 6000 ft from what I thought was 5800 ft. I reengaged the autopilot and we continued with the approach.
Original NASA ASRS Text
Title: B737 flight crew reported overshooting an altitude on descent after a discontinuity in the approach disconnected the autopilot.
Narrative: While in LNAV/VNAV on descent pilot monitoring reentered ILS approaching ZZZZZ in order to extend the ILS to ZZZZZ1. Got message unable due to altitude constraint. He deleted a couple points and executed as we passed ZZZZZ. I announced CWS (Control Wheel Steering) in both lateral and vertical and realized we needed to descend to 6000 ft at ZZZZZ2. I began the descent thinking I had disconnected the autopilot but was still in CWS. As we approached 6000 ft; I realized I had not disconnected the autopilot and the stick forces were substantial as I missed the level off altitude. I clicked off the autopilot and corrected back to 6000 ft from what I thought was 5800 ft. I reengaged the autopilot and we continued with the approach.
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.