Air carrier takeoff runway 22 without clearance while another aircraft had been clrd for takeoff run...

Attributes
ACN	99601
Time
Date	198812
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : roc
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : takeoff
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 6300 flight time type : 80
ASRS Report	99601
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : ground less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 5000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

We had a short taxi out to runway 22 at roc, but all check lists were complete by the time we held short of the runway. We held short for about a min though we had advised the tower we were ready for takeoff. The tower then evidently told us to 'taxi into position and hold,' but we misunderstood the tower and we took off. Nothing was said to us after we took off by either the tower or departure control. We didn't find out about the situation until we landed, and our company told us to call roc tower. When I talked to the tower supervisor he then explained to me what had happened. I told him we thought we were cleared for takeoff, but he said he played the tape and they told us to taxi into position and hold. Also, he said we replied with position and hold, but for some reason we took off. Both my first officer and myself have talked this over, and we can't believe we both heard the same thing, replied, but took off anyway. As far as I can see it must have been a bad case of complacency. What can I say but even when the WX is nice you can never let your guard down. You can be sure the rest of the trip we really listened close to everything that was said. Supplemental information from acn 99437: air carrier X was given instructions to taxi into position and hold, but took off without clearance. Reason for hold was not given to pilot, but traffic was departing runway 28.

Original NASA ASRS Text

Title: ACR TKOF RWY 22 WITHOUT CLRNC WHILE ANOTHER ACFT HAD BEEN CLRD FOR TKOF RWY 28. PILOT DEVIATION RESULTED IN LESS THAN STANDARD SEPARATION.

Narrative: WE HAD A SHORT TAXI OUT TO RWY 22 AT ROC, BUT ALL CHECK LISTS WERE COMPLETE BY THE TIME WE HELD SHORT OF THE RWY. WE HELD SHORT FOR ABOUT A MIN THOUGH WE HAD ADVISED THE TWR WE WERE READY FOR TKOF. THE TWR THEN EVIDENTLY TOLD US TO 'TAXI INTO POSITION AND HOLD,' BUT WE MISUNDERSTOOD THE TWR AND WE TOOK OFF. NOTHING WAS SAID TO US AFTER WE TOOK OFF BY EITHER THE TWR OR DEP CTL. WE DIDN'T FIND OUT ABOUT THE SITUATION UNTIL WE LANDED, AND OUR COMPANY TOLD US TO CALL ROC TWR. WHEN I TALKED TO THE TWR SUPVR HE THEN EXPLAINED TO ME WHAT HAD HAPPENED. I TOLD HIM WE THOUGHT WE WERE CLRED FOR TKOF, BUT HE SAID HE PLAYED THE TAPE AND THEY TOLD US TO TAXI INTO POSITION AND HOLD. ALSO, HE SAID WE REPLIED WITH POSITION AND HOLD, BUT FOR SOME REASON WE TOOK OFF. BOTH MY F/O AND MYSELF HAVE TALKED THIS OVER, AND WE CAN'T BELIEVE WE BOTH HEARD THE SAME THING, REPLIED, BUT TOOK OFF ANYWAY. AS FAR AS I CAN SEE IT MUST HAVE BEEN A BAD CASE OF COMPLACENCY. WHAT CAN I SAY BUT EVEN WHEN THE WX IS NICE YOU CAN NEVER LET YOUR GUARD DOWN. YOU CAN BE SURE THE REST OF THE TRIP WE REALLY LISTENED CLOSE TO EVERYTHING THAT WAS SAID. SUPPLEMENTAL INFORMATION FROM ACN 99437: ACR X WAS GIVEN INSTRUCTIONS TO TAXI INTO POSITION AND HOLD, BUT TOOK OFF WITHOUT CLRNC. REASON FOR HOLD WAS NOT GIVEN TO PLT, BUT TFC WAS DEPARTING RWY 28.

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.

Air carrier takeoff runway 22 without clearance while another aircraft had been clrd for takeoff runway 28. Pilot deviation resulted in less than standard separation.