Widebody transport makes unauthorized takeoff on a clearance for another company aircraft.

Attributes
ACN	115048
Time
Date	198906
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff ground : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 16000 flight time type : 400
ASRS Report	115048
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
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 faa : investigated
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approaching 35R at den, tower advised aircraft at 35 left/right of rerouting. East departures rerouted north. South and southeast departures on 35L rerouted south with 25 NM separation. Previous aircraft were cleared into position and hold runway 35R and told that takeoff clearance would be granted upon receipt of clearance. Widebody transport X was position and hold 35R. New clearance issued, readback acknowledged by tower. I.e., clearance correct, widebody transport cleared for takeoff. Acknowledged cleared to go. After takeoff heading of 010 degree issued. Two days later captain notified of alleged takeoff without clearance. Apparently takeoff clearance was for another company aircraft on runway 35L. Captain and first officer were unaware of any deviation.

Original NASA ASRS Text

Title: WDB MAKES UNAUTHORIZED TKOF ON A CLRNC FOR ANOTHER COMPANY ACFT.

Narrative: APCHING 35R AT DEN, TWR ADVISED ACFT AT 35 L/R OF REROUTING. EAST DEPS REROUTED NORTH. SOUTH AND SE DEPS ON 35L REROUTED SOUTH WITH 25 NM SEPARATION. PREVIOUS ACFT WERE CLRED INTO POSITION AND HOLD RWY 35R AND TOLD THAT TKOF CLRNC WOULD BE GRANTED UPON RECEIPT OF CLRNC. WDB X WAS POSITION AND HOLD 35R. NEW CLRNC ISSUED, READBACK ACKNOWLEDGED BY TWR. I.E., CLRNC CORRECT, WDB CLRED FOR TKOF. ACKNOWLEDGED CLRED TO GO. AFTER TKOF HDG OF 010 DEG ISSUED. TWO DAYS LATER CAPT NOTIFIED OF ALLEGED TKOF WITHOUT CLRNC. APPARENTLY TKOF CLRNC WAS FOR ANOTHER COMPANY ACFT ON RWY 35L. CAPT AND F/O WERE UNAWARE OF ANY DEVIATION.

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.