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Air carrier X unauthorized takeoff on occupied runway had less than standard separation from air carrier Y and aborted takeoff.
| Attributes | |
| ACN | 271482 |
| Time | |
| Date | 199405 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sea |
| State Reference | WA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff ground : holding |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 8000 flight time type : 240 |
| ASRS Report | 271482 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 11000 flight time type : 40 |
| ASRS Report | 271002 |
| Events | |
| Anomaly | conflict : ground less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | Other |
| Miss Distance | horizontal : 4000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X received takeoff clearance from runway 16L at seattle (apparently clearance was for another aircraft), read back clearance along with appropriate call sign. As we were setting takeoff power and completing takeoff checklist. Noticed air carrier Y still on runway downfield (same runway) slowed down and taxied off runway because it was apparent that both aircraft were going to depart too close to each other. Advised tower and were told that we were not cleared for takeoff. We then taxied back to takeoff. I believe this was simply an error in communication and my only suggestion for prevention of a recurrence would be clarifying verbiage on radio and controller listening to make sure proper aircraft answers instructions. We also should have been listening for aircraft downfield to read back their takeoff clearance. We only presumed they had received it earlier. Supplemental information from acn 271002: the problem we had occurred after we started the roll. We see the aircraft and expected it to be rotating immediately and making a quick right turn. The smaller and slower dash 8 was not off the ground, nor did it turn when leaving the ground -- we decided to stop our takeoff rather than chance overrunning the slower aircraft.
Original NASA ASRS Text
Title: ACR X UNAUTH TKOF ON OCCUPIED RWY HAD LTSS FROM ACR Y AND ABORTED TKOF.
Narrative: ACR X RECEIVED TKOF CLRNC FROM RWY 16L AT SEATTLE (APPARENTLY CLRNC WAS FOR ANOTHER ACFT), READ BACK CLRNC ALONG WITH APPROPRIATE CALL SIGN. AS WE WERE SETTING TKOF PWR AND COMPLETING TKOF CHKLIST. NOTICED ACR Y STILL ON RWY DOWNFIELD (SAME RWY) SLOWED DOWN AND TAXIED OFF RWY BECAUSE IT WAS APPARENT THAT BOTH ACFT WERE GOING TO DEPART TOO CLOSE TO EACH OTHER. ADVISED TWR AND WERE TOLD THAT WE WERE NOT CLRED FOR TKOF. WE THEN TAXIED BACK TO TKOF. I BELIEVE THIS WAS SIMPLY AN ERROR IN COM AND MY ONLY SUGGESTION FOR PREVENTION OF A RECURRENCE WOULD BE CLARIFYING VERBIAGE ON RADIO AND CTLR LISTENING TO MAKE SURE PROPER ACFT ANSWERS INSTRUCTIONS. WE ALSO SHOULD HAVE BEEN LISTENING FOR ACFT DOWNFIELD TO READ BACK THEIR TKOF CLRNC. WE ONLY PRESUMED THEY HAD RECEIVED IT EARLIER. SUPPLEMENTAL INFO FROM ACN 271002: THE PROB WE HAD OCCURRED AFTER WE STARTED THE ROLL. WE SEE THE ACFT AND EXPECTED IT TO BE ROTATING IMMEDIATELY AND MAKING A QUICK R TURN. THE SMALLER AND SLOWER DASH 8 WAS NOT OFF THE GND, NOR DID IT TURN WHEN LEAVING THE GND -- WE DECIDED TO STOP OUR TKOF RATHER THAN CHANCE OVERRUNNING THE SLOWER ACFT.
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.