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Flight crew of a B757 used vectors and VORTAC direct navigation after noticing faulty indications and actions of the aircraft's FMS during departure climb from a foreign airport. The cause was suspected to have been caused by passenger use of an electronic computer game.
| Attributes | |
| ACN | 403730 |
| Time | |
| Date | 199805 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bgi |
| State Reference | FO |
| Altitude | msl bound lower : 1000 msl bound upper : 1000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bgi |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 403730 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On takeoff out of bgi, we were alerted to a GPWS too low terrain alert and then a major FMS map shift was noted. On turning to the north and re-evaluating the shift, it was noted to be about 30 mi offset, too. We had the #1 flight attendant check the cabin and found a young passenger playing a game boy. We continued the flight under alternative navigation methods, ie, vectors and navaids to navaids since we could not trust the FMS. All other operations normal.
Original NASA ASRS Text
Title: FLC OF A B757 USED VECTORS AND VORTAC DIRECT NAV AFTER NOTICING FAULTY INDICATIONS AND ACTIONS OF THE ACFT'S FMS DURING DEP CLB FROM A FOREIGN ARPT. THE CAUSE WAS SUSPECTED TO HAVE BEEN CAUSED BY PAX USE OF AN ELECTRONIC COMPUTER GAME.
Narrative: ON TKOF OUT OF BGI, WE WERE ALERTED TO A GPWS TOO LOW TERRAIN ALERT AND THEN A MAJOR FMS MAP SHIFT WAS NOTED. ON TURNING TO THE N AND RE-EVALUATING THE SHIFT, IT WAS NOTED TO BE ABOUT 30 MI OFFSET, TOO. WE HAD THE #1 FLT ATTENDANT CHK THE CABIN AND FOUND A YOUNG PAX PLAYING A GAME BOY. WE CONTINUED THE FLT UNDER ALTERNATIVE NAV METHODS, IE, VECTORS AND NAVAIDS TO NAVAIDS SINCE WE COULD NOT TRUST THE FMS. ALL OTHER OPS NORMAL.
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.