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B737-800 captain reported the autopilot reverted to cws during a turn to final; and the bank angle went to 45 degrees.
| Attributes | |
| ACN | 1249697 |
| Time | |
| Date | 201503 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Turning to final for runway 9L; a 90 degree turn at 3000 feet with autopilot on; the autopilot reverted to cws and the bank angle went to 45 degree before the autopilot was disconnected and roll was reduced. We stabilized the approach and continued to visual landing. We are not sure the reason for the roll mode reverting to cws but might have deselect heading select when turning the heading selector.
Original NASA ASRS Text
Title: B737-800 Captain reported the autopilot reverted to CWS during a turn to final; and the bank angle went to 45 degrees.
Narrative: Turning to final for runway 9L; a 90 degree turn at 3000 feet with autopilot on; the autopilot reverted to CWS and the bank angle went to 45 degree before the autopilot was disconnected and roll was reduced. We stabilized the approach and continued to visual landing. We are not sure the reason for the roll mode reverting to CWS but might have deselect heading select when turning the heading selector.
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.