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B767 aircraft on STAR arrival, flight crew suspects FMC map shift because raw data showed 2 mi off track. Approach controller gave a heading clearance for intercept.
| Attributes | |
| ACN | 398137 |
| Time | |
| Date | 199803 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Light | Daylight |
| 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 | cruise other descent other |
| Route In Use | arrival other arrival star : star enroute airway : lax |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 398137 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On the mitts arrival to ILS runway 24R at lax, we discovered an approximately 2 mi map shift as compared to raw data. With this added distraction after a close-in change to the arrival and ILS runway, we were slightly south of the localizer when lax approach asked to turn right 20 degrees and intercept the localizer. We complied and there was no further remarks from lax approach. I believe the high workload of approach changes with the map shift contributed to our being south of the localizer.
Original NASA ASRS Text
Title: B767 ACFT ON STAR ARR, FLC SUSPECTS FMC MAP SHIFT BECAUSE RAW DATA SHOWED 2 MI OFF TRACK. APCH CTLR GAVE A HDG CLRNC FOR INTERCEPT.
Narrative: ON THE MITTS ARR TO ILS RWY 24R AT LAX, WE DISCOVERED AN APPROX 2 MI MAP SHIFT AS COMPARED TO RAW DATA. WITH THIS ADDED DISTR AFTER A CLOSE-IN CHANGE TO THE ARR AND ILS RWY, WE WERE SLIGHTLY S OF THE LOC WHEN LAX APCH ASKED TO TURN R 20 DEGS AND INTERCEPT THE LOC. WE COMPLIED AND THERE WAS NO FURTHER REMARKS FROM LAX APCH. I BELIEVE THE HIGH WORKLOAD OF APCH CHANGES WITH THE MAP SHIFT CONTRIBUTED TO OUR BEING S OF THE LOC.
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.