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A DC10 landing at lax, ca, has its flight instruments indicate the aircraft is off course according to TRACON radar.
| Attributes | |
| ACN | 388239 |
| Time | |
| Date | 199712 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : 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 | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 388239 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 388240 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : became reoriented flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
We diverted to lax due to a GPS navigation problem with associated CADC input error. During the reedr arrival for a landing on runway 7R we realized both captain's and first officer's localizer were indicating left of course. We asked ATC about our position, he indicated that radar showed us 2 mi north of course. Both localizer on the aircraft showed us 1.5 mi south or left of course. We are not sure if our other navigation problems were causing the improper indication on our HSI. We asked for vectors for a landing on runway 7R at lax. The localizer indicated properly when flying the approach to runway 7R. Perhaps there was a back course problem since the runway 7R localizer was being used. We rechked our radio frequency and we had the proper heading and inbounds set for the reedr STAR. Supplemental information from acn 388240: on reedr arrival ATC advised we were 2 mi left of course. Our instruments showed the opposite. We requested and received vectors to final.
Original NASA ASRS Text
Title: A DC10 LNDG AT LAX, CA, HAS ITS FLT INSTS INDICATE THE ACFT IS OFF COURSE ACCORDING TO TRACON RADAR.
Narrative: WE DIVERTED TO LAX DUE TO A GPS NAV PROB WITH ASSOCIATED CADC INPUT ERROR. DURING THE REEDR ARR FOR A LNDG ON RWY 7R WE REALIZED BOTH CAPT'S AND FO'S LOC WERE INDICATING L OF COURSE. WE ASKED ATC ABOUT OUR POS, HE INDICATED THAT RADAR SHOWED US 2 MI N OF COURSE. BOTH LOC ON THE ACFT SHOWED US 1.5 MI S OR L OF COURSE. WE ARE NOT SURE IF OUR OTHER NAV PROBS WERE CAUSING THE IMPROPER INDICATION ON OUR HSI. WE ASKED FOR VECTORS FOR A LNDG ON RWY 7R AT LAX. THE LOC INDICATED PROPERLY WHEN FLYING THE APCH TO RWY 7R. PERHAPS THERE WAS A BACK COURSE PROB SINCE THE RWY 7R LOC WAS BEING USED. WE RECHKED OUR RADIO FREQ AND WE HAD THE PROPER HEADING AND INBOUNDS SET FOR THE REEDR STAR. SUPPLEMENTAL INFO FROM ACN 388240: ON REEDR ARR ATC ADVISED WE WERE 2 MI L OF COURSE. OUR INSTS SHOWED THE OPPOSITE. WE REQUESTED AND RECEIVED VECTORS TO FINAL.
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.