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Air carrier B727 flight crew initially determine tower clearance for takeoff allowed them to taxi onto intersecting runway for departure due to taxiway closure. Though flight crew dispute clearance, and hoped for a more definitive clearance, they conclude they were technically in error.
| Attributes | |
| ACN | 406272 |
| Time | |
| Date | 199806 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mso |
| State Reference | MT |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mso |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground other : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3000 flight time type : 200 |
| ASRS Report | 406272 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 12000 flight time type : 880 |
| ASRS Report | 406269 |
| Events | |
| Anomaly | incursion : runway non adherence : published procedure non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Incident occurred during taxi from gate to runway 11. Txwys a and F were closed. Available routing was ramp, taxiway east, runway 7/25, back taxi on runway 11/29, departure end of runway 11. Ground cleared us to taxi to runway 11. We proceeded along the above mentioned routing, including back taxi on runway 11/25. This was the only available taxiway to runway 11. Approximately 2500-3000 ft down runway 11/25, while back taxiing, tower/ground queried us about clearance to enter runway 11/25. We explained our understanding of the clearance and apologized. Tower/ground then issued us back taxi clearance. There was no conflict with any other ground or air traffic. In fact, there were no other aircraft on either frequency. In hindsight, I believe the controller was correct in his clearance and we should have held short of runway 11/25 for further clearance. However, in the interest of clarity and safety the controller could have included '...hold short of runway 11/25 for back taxi clearance,' to his taxi instructions. This statement would have removed all doubt in what he wanted. Air-time was not a factor. Our flight was the only aircraft on frequency at XA55 in missoula, mt.
Original NASA ASRS Text
Title: ACR B727 FLC INITIALLY DETERMINE TWR CLRNC FOR TKOF ALLOWED THEM TO TAXI ONTO INTERSECTING RWY FOR DEP DUE TO TXWY CLOSURE. THOUGH FLC DISPUTE CLRNC, AND HOPED FOR A MORE DEFINITIVE CLRNC, THEY CONCLUDE THEY WERE TECHNICALLY IN ERROR.
Narrative: INCIDENT OCCURRED DURING TAXI FROM GATE TO RWY 11. TXWYS A AND F WERE CLOSED. AVAILABLE ROUTING WAS RAMP, TXWY E, RWY 7/25, BACK TAXI ON RWY 11/29, DEP END OF RWY 11. GND CLRED US TO TAXI TO RWY 11. WE PROCEEDED ALONG THE ABOVE MENTIONED ROUTING, INCLUDING BACK TAXI ON RWY 11/25. THIS WAS THE ONLY AVAILABLE TXWY TO RWY 11. APPROX 2500-3000 FT DOWN RWY 11/25, WHILE BACK TAXIING, TWR/GND QUERIED US ABOUT CLRNC TO ENTER RWY 11/25. WE EXPLAINED OUR UNDERSTANDING OF THE CLRNC AND APOLOGIZED. TWR/GND THEN ISSUED US BACK TAXI CLRNC. THERE WAS NO CONFLICT WITH ANY OTHER GND OR AIR TFC. IN FACT, THERE WERE NO OTHER ACFT ON EITHER FREQ. IN HINDSIGHT, I BELIEVE THE CTLR WAS CORRECT IN HIS CLRNC AND WE SHOULD HAVE HELD SHORT OF RWY 11/25 FOR FURTHER CLRNC. HOWEVER, IN THE INTEREST OF CLARITY AND SAFETY THE CTLR COULD HAVE INCLUDED '...HOLD SHORT OF RWY 11/25 FOR BACK TAXI CLRNC,' TO HIS TAXI INSTRUCTIONS. THIS STATEMENT WOULD HAVE REMOVED ALL DOUBT IN WHAT HE WANTED. AIR-TIME WAS NOT A FACTOR. OUR FLT WAS THE ONLY ACFT ON FREQ AT XA55 IN MISSOULA, MT.
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.