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B777 first officer reported the autopilot veered off course with a hard bank to the right while on final approach to vabb.
| Attributes | |
| ACN | 1544536 |
| Time | |
| Date | 201805 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | VABB.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Other VABB VOR Runway 27 |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 250 Flight Crew Total 13562 Flight Crew Type 10316 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types |
Narrative:
On arrival and approach to (mumbai) vabb VOR runway 27 at approximately 3.5 DME and 1;320 feet; which coincides with point [40vo2] and on autopilot flying a VOR/VNAV the autopilot abruptly banked hard right and started to pull us off the VOR final approach course (VFR conditions). The captain disconnected autopilot and rejoined the final approach course with no issues. This has happened to another crew albeit at 6 miles out. This is a concern as it seems repetitive in nature and there is terrain to the east. Luckily; it was VFR for our arrival with no other concerns. Would be interested to know the possible cause of this break off while on autopilot on apparently multiple occasions on different flights so pre-emptive measure can be taken to alleviate or possibly prevent this issue on ensuing approaches in the future. We were aware of its possibility occurring and as such took corrective actions and were prepared when it did materialize and occur.
Original NASA ASRS Text
Title: B777 First Officer reported the autopilot veered off course with a hard bank to the right while on final approach to VABB.
Narrative: On arrival and approach to (Mumbai) VABB VOR Runway 27 at approximately 3.5 DME and 1;320 feet; which coincides with point [40VO2] and on autopilot flying a VOR/VNAV the autopilot abruptly banked hard right and started to pull us off the VOR final approach course (VFR conditions). The Captain disconnected autopilot and rejoined the final approach course with no issues. This has happened to another crew albeit at 6 miles out. This is a concern as it seems repetitive in nature and there is terrain to the east. Luckily; it was VFR for our arrival with no other concerns. Would be interested to know the possible cause of this break off while on autopilot on apparently multiple occasions on different flights so pre-emptive measure can be taken to alleviate or possibly prevent this issue on ensuing approaches in the future. We were aware of its possibility occurring and as such took corrective actions and were prepared when it did materialize and occur.
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.