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Large transport taxiing at night on new taxiway not shown on the commercial chart. Aircraft was in a hard turn when right main gear went off hard surface of taxiway and sunk in soft turf. Passengers off loaded. No damage to aircraft. Departed next day. Callback revealed chart has been corrected.
| Attributes | |
| ACN | 112489 |
| Time | |
| Date | 198905 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bis |
| State Reference | ND |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | ground other : taxi |
| 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 : 7900 flight time type : 2350 |
| ASRS Report | 112489 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 125 flight time total : 10000 flight time type : 490 |
| ASRS Report | 112617 |
| Events | |
| Anomaly | other anomaly other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| Airport | other physical facility |
Narrative:
During taxi out to runway 13 for takeoff, aircraft taxied onto a new, unknown taxiway en route to 'a' taxiway. During a turn of over 120 degree, aircraft right main landing gear departed paved surface onto soft ground. Taxiway was lighted and appeared en route to parallel taxiway. New taxiway was not depicted on any airport plate or chart. No injuries occurred to passenger or crew. No damage to aircraft. Better taxiway signs would have prevented this incident. Supplemental information from acn 112617: perhaps contributing to this incident was crew fatigue. Duty time up to the occurrence had been about 11 hours. Flight time about 7 hours with an additional 30 minutes to go. The duty day had included flight deviations and ground delays because of thunderstorms on the previous legs of our trip pairing.
Original NASA ASRS Text
Title: LGT TAXIING AT NIGHT ON NEW TXWY NOT SHOWN ON THE COMMERCIAL CHART. ACFT WAS IN A HARD TURN WHEN RIGHT MAIN GEAR WENT OFF HARD SURFACE OF TXWY AND SUNK IN SOFT TURF. PASSENGERS OFF LOADED. NO DAMAGE TO ACFT. DEPARTED NEXT DAY. CALLBACK REVEALED CHART HAS BEEN CORRECTED.
Narrative: DURING TAXI OUT TO RWY 13 FOR TKOF, ACFT TAXIED ONTO A NEW, UNKNOWN TXWY ENRTE TO 'A' TXWY. DURING A TURN OF OVER 120 DEG, ACFT RIGHT MAIN LNDG GEAR DEPARTED PAVED SURFACE ONTO SOFT GND. TXWY WAS LIGHTED AND APPEARED ENRTE TO PARALLEL TXWY. NEW TXWY WAS NOT DEPICTED ON ANY ARPT PLATE OR CHART. NO INJURIES OCCURRED TO PAX OR CREW. NO DAMAGE TO ACFT. BETTER TXWY SIGNS WOULD HAVE PREVENTED THIS INCIDENT. SUPPLEMENTAL INFORMATION FROM ACN 112617: PERHAPS CONTRIBUTING TO THIS INCIDENT WAS CREW FATIGUE. DUTY TIME UP TO THE OCCURRENCE HAD BEEN ABOUT 11 HRS. FLT TIME ABOUT 7 HRS WITH AN ADDITIONAL 30 MINUTES TO GO. THE DUTY DAY HAD INCLUDED FLT DEVIATIONS AND GND DELAYS BECAUSE OF TSTMS ON THE PREVIOUS LEGS OF OUR TRIP PAIRING.
Data retrieved from NASA's ASRS site as of August 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.