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A B767 captain reported the autoflight system failed to adhere to crossing restrictions on the seavu arrival into lax; crossing two intersections below charted altitude.
| Attributes | |
| ACN | 899847 |
| Time | |
| Date | 201007 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | SCT.TRACON |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR SEAVU TWO |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 202 Flight Crew Total 11000 Flight Crew Type 3000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Descending on seavu two arrival into lax. While approaching konzl; I became slightly distracted verifying further crossing restrictions. Although the center autopilot was engaged and LNAV/VNAV captured; autopilot failed to maintain the path. First officer said we were low. I immediately flew the plane manually; but noticed we were 400 ft low over konzl. I re-engaged the autopilot. Again; with LNAV/VNAV captured; the aircraft descended below the path and passed engli 300 ft low before I could take over manually. I continued to hand fly and instructed the first officer to attempt to reset the MCP. The first officer successfully reset the MCP. I reengaged the autopilot and the aircraft was able to comply with all further crossing restrictions. There were no conflicts with any other aircraft.
Original NASA ASRS Text
Title: A B767 Captain reported the autoflight system failed to adhere to crossing restrictions on the SEAVU arrival into LAX; crossing two intersections below charted altitude.
Narrative: Descending on SEAVU TWO arrival into LAX. While approaching KONZL; I became slightly distracted verifying further crossing restrictions. Although the center autopilot was engaged and LNAV/VNAV captured; autopilot failed to maintain the path. First Officer said we were low. I immediately flew the plane manually; but noticed we were 400 FT low over KONZL. I re-engaged the autopilot. Again; with LNAV/VNAV captured; the aircraft descended below the path and passed ENGLI 300 FT low before I could take over manually. I continued to hand fly and instructed the First Officer to attempt to reset the MCP. The First Officer successfully reset the MCP. I reengaged the autopilot and the aircraft was able to comply with all further crossing restrictions. There were no conflicts with any other aircraft.
Data retrieved from NASA's ASRS site as of April 2012 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.