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Air carrier finds themselves off course and not intercepting an ILS with navigation instruments in disagreement as to position. Visual adjustments were made to successful landing with passenger use of cell phone suspected as the culprit.
| Attributes | |
| ACN | 460415 |
| Time | |
| Date | 200001 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : i90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 09 other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer pilot : private pilot : cfi pilot : commercial pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 8500 flight time type : 600 |
| ASRS Report | 460415 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : clearance non adherence : far other anomaly other other spatial deviation |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : became reoriented flight crew : overcame equipment problem flight crew : returned to original clearance |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Passenger Human Performance FAA Aircraft |
| Primary Problem | Passenger Human Performance |
Narrative:
While being vectored for approach to runway 9 iah at 4000 ft and 20 mi west of iah, ATC said 'fly 050 degrees to intercept localizer, maintain 4000 ft until established, cleared for ILS runway 9 iah.' our FMC map display showed 1 position and our HSI/ADI raw data showed no intercept. However, we realized we were too far north. We corrected and continued visually. We spoke with ATC on the ground and they said no action would be taken. We believe a passenger with a cell phone disrupted our signal and caused our deviation.
Original NASA ASRS Text
Title: ACR FINDS THEMSELVES OFF COURSE AND NOT INTERCEPTING AN ILS WITH NAV INSTS IN DISAGREEMENT AS TO POS. VISUAL ADJUSTMENTS WERE MADE TO SUCCESSFUL LNDG WITH PAX USE OF CELL PHONE SUSPECTED AS THE CULPRIT.
Narrative: WHILE BEING VECTORED FOR APCH TO RWY 9 IAH AT 4000 FT AND 20 MI W OF IAH, ATC SAID 'FLY 050 DEGS TO INTERCEPT LOC, MAINTAIN 4000 FT UNTIL ESTABLISHED, CLRED FOR ILS RWY 9 IAH.' OUR FMC MAP DISPLAY SHOWED 1 POS AND OUR HSI/ADI RAW DATA SHOWED NO INTERCEPT. HOWEVER, WE REALIZED WE WERE TOO FAR N. WE CORRECTED AND CONTINUED VISUALLY. WE SPOKE WITH ATC ON THE GND AND THEY SAID NO ACTION WOULD BE TAKEN. WE BELIEVE A PAX WITH A CELL PHONE DISRUPTED OUR SIGNAL AND CAUSED OUR DEV.
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.