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Flight crew of a DC9 took off with clearance due to a misunderstanding of tower controller's instructions to taxi into position and hold.
| Attributes | |
| ACN | 404230 |
| Time | |
| Date | 199806 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| 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 : cfi pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 13800 flight time type : 1100 |
| ASRS Report | 404230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9500 flight time type : 4000 |
| ASRS Report | 404232 |
| Events | |
| Anomaly | incursion : runway non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Took off and later was told we did so without a clearance, after talking to tower supervisor. He says we were cleared into position and to hold. This was done a few hundred yards from runway. As I was about to turn onto the runway, another plane looked lined up with our runway. When it was apparent he was going to runway 28L, I went on to runway 28C and pulled up to the end of the runway. Made comment about traffic crossing down the runway. When traffic was clear, we took off, after asking first officer 'all set to go?' he also thought we were clear to go. Was given heading after takeoff. We did not know until hours later about the discrepancy in the clearance. Could have been distracted by other aircraft landing, or long pause in clearance, I don't know.
Original NASA ASRS Text
Title: FLC OF A DC9 TOOK OFF WITH CLRNC DUE TO A MISUNDERSTANDING OF TWR CTLR'S INSTRUCTIONS TO TAXI INTO POS AND HOLD.
Narrative: TOOK OFF AND LATER WAS TOLD WE DID SO WITHOUT A CLRNC, AFTER TALKING TO TWR SUPVR. HE SAYS WE WERE CLRED INTO POS AND TO HOLD. THIS WAS DONE A FEW HUNDRED YARDS FROM RWY. AS I WAS ABOUT TO TURN ONTO THE RWY, ANOTHER PLANE LOOKED LINED UP WITH OUR RWY. WHEN IT WAS APPARENT HE WAS GOING TO RWY 28L, I WENT ON TO RWY 28C AND PULLED UP TO THE END OF THE RWY. MADE COMMENT ABOUT TFC XING DOWN THE RWY. WHEN TFC WAS CLR, WE TOOK OFF, AFTER ASKING FO 'ALL SET TO GO?' HE ALSO THOUGHT WE WERE CLR TO GO. WAS GIVEN HEADING AFTER TKOF. WE DID NOT KNOW UNTIL HRS LATER ABOUT THE DISCREPANCY IN THE CLRNC. COULD HAVE BEEN DISTRACTED BY OTHER ACFT LNDG, OR LONG PAUSE IN CLRNC, I DON'T KNOW.
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.