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B737 flight crew reported an autopilot anomaly while attempting to intercept the localizer and glideslope with the approach mode armed. Upon localizer intercept the autopilot turned right as if to join but continues in the right turn away from the localizer before the first officer intervenes. ATC takes note of the deviation.
| Attributes | |
| ACN | 1291600 |
| Time | |
| Date | 201508 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | OAK.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | STAR EMZOH1 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Approach Coupler |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 257 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 226 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
We were flying the RNAV arrival into oakland and were cleared for the approach to 30L. It was about a 45 degree intercept to the 296 course from the arrival. The first officer selected approach mode prior to the localizer. Upon reaching the localizer course; the aircraft did not join the course (autopilot on) and instead; continued in a right turn. By the time we corrected; the aircraft was about 30 degrees off course. Approach queried our deviation and gave us a heading to rejoin the localizer.
Original NASA ASRS Text
Title: B737 flight crew reported an autopilot anomaly while attempting to intercept the LOC and glideslope with the approach mode armed. Upon LOC intercept the autopilot turned right as if to join but continues in the right turn away from the LOC before the First Officer intervenes. ATC takes note of the deviation.
Narrative: We were flying the RNAV Arrival into Oakland and were cleared for the approach to 30L. It was about a 45 degree intercept to the 296 course from the arrival. The FO selected approach mode prior to the Localizer. Upon reaching the Localizer course; the aircraft did not join the course (autopilot on) and instead; continued in a right turn. By the time we corrected; the aircraft was about 30 degrees off course. Approach queried our deviation and gave us a heading to rejoin the Localizer.
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.