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B767 track deviation on STAR arrival into lax. Aircraft operating on FMS but was one half mi south of inbound VOR course. Controller called flight.
| Attributes | |
| ACN | 396030 |
| Time | |
| Date | 199803 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 9000 msl bound upper : 12000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 396030 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 395890 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
40 DME from lax. We were descending via the civet three arrival when ATC advised us that we were 1/2 mi south of course. I was in raw data the entire arrival but had not noticed until the controller advised us that we were south of course. LNAV showed us right on course. We visually and with raw data confirmed that we were in fact off course slightly. To my knowledge no other aircraft had to deviate as a result. Supplemental information from acn 395890: we noticed the raw data localizer was right of our FMC course. We started correcting to the right when ATC told us we were 1/2 mi left of course. We corrected course and flew data for the rest of the arrival.
Original NASA ASRS Text
Title: B767 TRACK DEV ON STAR ARR INTO LAX. ACFT OPERATING ON FMS BUT WAS ONE HALF MI S OF INBOUND VOR COURSE. CTLR CALLED FLT.
Narrative: 40 DME FROM LAX. WE WERE DSNDING VIA THE CIVET THREE ARR WHEN ATC ADVISED US THAT WE WERE 1/2 MI S OF COURSE. I WAS IN RAW DATA THE ENTIRE ARR BUT HAD NOT NOTICED UNTIL THE CTLR ADVISED US THAT WE WERE S OF COURSE. LNAV SHOWED US RIGHT ON COURSE. WE VISUALLY AND WITH RAW DATA CONFIRMED THAT WE WERE IN FACT OFF COURSE SLIGHTLY. TO MY KNOWLEDGE NO OTHER ACFT HAD TO DEVIATE AS A RESULT. SUPPLEMENTAL INFO FROM ACN 395890: WE NOTICED THE RAW DATA LOC WAS R OF OUR FMC COURSE. WE STARTED CORRECTING TO THE R WHEN ATC TOLD US WE WERE 1/2 MI L OF COURSE. WE CORRECTED COURSE AND FLEW DATA FOR THE REST OF THE ARR.
Data retrieved from NASA's ASRS site as of July 2007 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.