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Air carrier flight crew report on heading track deviation while apparently on localizer course, but infringing on parallel localizer course.
| Attributes | |
| ACN | 238899 |
| Time | |
| Date | 199304 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent : approach |
| Route In Use | approach : straight in enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent : approach |
| Route In Use | approach : straight in enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 5200 flight time type : 1000 |
| ASRS Report | 238899 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical conflict : airborne less severe non adherence : required legal separation non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 700 |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On ILS approach runway 9R, both navigation receivers showed us established inbound on the localizer. TCASII showed traffic at 11 O'clock and issued a TA. Traffic became closer, TCASII issued an RA to stop descending. At the same time, ATC told us to turn 25 degrees right to re-intercept 9R localizer. We had drifted towards the 9L localizer. We complied with ATC's instructions. This time, we intercepted 9R localizer and landed normally. Had maintenance check the navigation system, they found no defects. I suspect traffic on the ground strayed too close to the localizer signal, giving us an erroneous indication.
Original NASA ASRS Text
Title: ACR FLC RPT ON HDG TRACK DEV WHILE APPARENTLY ON LOC COURSE, BUT INFRINGING ON PARALLEL LOC COURSE.
Narrative: ON ILS APCH RWY 9R, BOTH NAV RECEIVERS SHOWED US ESTABLISHED INBOUND ON THE LOC. TCASII SHOWED TFC AT 11 O'CLOCK AND ISSUED A TA. TFC BECAME CLOSER, TCASII ISSUED AN RA TO STOP DSNDING. AT THE SAME TIME, ATC TOLD US TO TURN 25 DEGS R TO RE-INTERCEPT 9R LOC. WE HAD DRIFTED TOWARDS THE 9L LOC. WE COMPLIED WITH ATC'S INSTRUCTIONS. THIS TIME, WE INTERCEPTED 9R LOC AND LANDED NORMALLY. HAD MAINT CHK THE NAV SYS, THEY FOUND NO DEFECTS. I SUSPECT TFC ON THE GND STRAYED TOO CLOSE TO THE LOC SIGNAL, GIVING US AN ERRONEOUS INDICATION.
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.