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Ground traffic conflict when pilot changed frequency becoming an uncontrolled aircraft at a major airport.
| Attributes | |
| ACN | 438977 |
| Time | |
| Date | 199905 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iad.airport |
| State Reference | VA |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : lga.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Stratoliner 720 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : taxi |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : iad.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 4500 |
| ASRS Report | 438977 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | conflict : ground critical ground encounters other non adherence : far |
| Resolutory Action | flight crew : took precautionary avoidance action none taken : unable |
| Miss Distance | horizontal : 50 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
First officer switched to ramp frequency while taxiing north on taxiway K to air carrier a ramp. Air carrier B B737 had intended to exit taxiway east ramp in front of our aircraft, but he had to follow us, as we were no longer on ground frequency. First officer believed ground controller had switched him to ramp frequency while still taxiing north on taxiway K. Sometimes they switch you early -- sometimes they don't. It could have happened either way.
Original NASA ASRS Text
Title: GND TFC CONFLICT WHEN PLT CHANGED FREQ BECOMING AN UNCTLED ACFT AT A MAJOR ARPT.
Narrative: FO SWITCHED TO RAMP FREQ WHILE TAXIING N ON TXWY K TO ACR A RAMP. ACR B B737 HAD INTENDED TO EXIT TXWY E RAMP IN FRONT OF OUR ACFT, BUT HE HAD TO FOLLOW US, AS WE WERE NO LONGER ON GND FREQ. FO BELIEVED GND CTLR HAD SWITCHED HIM TO RAMP FREQ WHILE STILL TAXIING N ON TXWY K. SOMETIMES THEY SWITCH YOU EARLY -- SOMETIMES THEY DON'T. IT COULD HAVE HAPPENED EITHER WAY.
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.