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A foreign air carrier's B747 observers accused medium large transport air carrier flight crew of overlapping wingtips during taxi. The qualified captain taxiing (who had been assigned sic) had maintained wingtip clearance from his perspective in the cockpit. Potential ground conflict.
| Attributes | |
| ACN | 326874 |
| Time | |
| Date | 199601 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | ground other : taxi |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Flight Phase | other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 15000 flight time type : 7000 |
| ASRS Report | 326874 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 17000 flight time type : 12000 |
| ASRS Report | 326880 |
| Events | |
| Anomaly | conflict : ground less severe other anomaly other |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Our flight was cleared to active runway. Subsequently we observed a foreign air carrier's B747 which had pushed back into alley. We proceeded around the aircraft on the right side, wingtip clearance from our perspective being maintained. Other air carrier's ground personnel later claimed that our wingtips had overlapped. From my perspective it appeared that there was no conflict whatsoever. Supplemental information from acn 326880: captain qualified first officer in the left seat claimed clearance was maintained throughout. The foreign air carrier's observers were near the nose of their aircraft and a possible parallax from their perspective may have made it look like wingtips overlapped. Additionally, we thought this maneuver had been approved by ground since they gave us clearance to taxi and were aware of the B747. This was not necessarily a valid assumption on my part.
Original NASA ASRS Text
Title: A FOREIGN ACR'S B747 OBSERVERS ACCUSED MLG ACR FLC OF OVERLAPPING WINGTIPS DURING TAXI. THE QUALIFIED CAPT TAXIING (WHO HAD BEEN ASSIGNED SIC) HAD MAINTAINED WINGTIP CLRNC FROM HIS PERSPECTIVE IN THE COCKPIT. POTENTIAL GND CONFLICT.
Narrative: OUR FLT WAS CLRED TO ACTIVE RWY. SUBSEQUENTLY WE OBSERVED A FOREIGN ACR'S B747 WHICH HAD PUSHED BACK INTO ALLEY. WE PROCEEDED AROUND THE ACFT ON THE R SIDE, WINGTIP CLRNC FROM OUR PERSPECTIVE BEING MAINTAINED. OTHER ACR'S GND PERSONNEL LATER CLAIMED THAT OUR WINGTIPS HAD OVERLAPPED. FROM MY PERSPECTIVE IT APPEARED THAT THERE WAS NO CONFLICT WHATSOEVER. SUPPLEMENTAL INFO FROM ACN 326880: CAPT QUALIFIED FO IN THE L SEAT CLAIMED CLRNC WAS MAINTAINED THROUGHOUT. THE FOREIGN ACR'S OBSERVERS WERE NEAR THE NOSE OF THEIR ACFT AND A POSSIBLE PARALLAX FROM THEIR PERSPECTIVE MAY HAVE MADE IT LOOK LIKE WINGTIPS OVERLAPPED. ADDITIONALLY, WE THOUGHT THIS MANEUVER HAD BEEN APPROVED BY GND SINCE THEY GAVE US CLRNC TO TAXI AND WERE AWARE OF THE B747. THIS WAS NOT NECESSARILY A VALID ASSUMPTION ON MY PART.
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.