Small transport on takeoff roll runway 29R sighted a C206 taxiing opposite direction on runway 11L. Small transport was at rotation speed and was able to continue takeoff, passing over the top of the cessna by 100 ft. Later conversation with the tower indicated that it was a system error.

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Attributes
ACN	321561
Time
Date	199511
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bjc
State Reference	CO
Altitude	agl bound lower : 100 agl bound upper : 100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bjc
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Flight Plan	None
Aircraft 2
Make Model Name	Cessna Stationair/Turbo Stationair 6
Operating Under FAR Part	Part 91
Flight Phase	ground other : taxi
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 40 flight time total : 1430 flight time type : 100
ASRS Report	321561
Person 2
Affiliation	Other
Function	instruction : trainee
Events
Anomaly	conflict : ground critical conflict : nmac non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While conducting a training flight at jefferson county airport, co (bjc), we were cleared to takeoff runway 29R by tower. Takeoff was continuing normally until we crested the hump in the middle of the runway. I then noticed a C206 taxiing opposite direction down the center of the runway, pretty much at the last 1/3 of the runway, at which time we achieved rotation speed VMC +5 92 mph. Climb out was normal and it appeared we cleared aircraft by about 100 ft. We informed tower and they were apparently unaware of the taxiing aircraft. The C206 did not appear to take evasive action. I called tower manager and gave statement. Apparently he reported it was a controller error and there is an investigation.

Original NASA ASRS Text

Title: SMT ON TKOF ROLL RWY 29R SIGHTED A C206 TAXIING OPPOSITE DIRECTION ON RWY 11L. SMT WAS AT ROTATION SPD AND WAS ABLE TO CONTINUE TKOF, PASSING OVER THE TOP OF THE CESSNA BY 100 FT. LATER CONVERSATION WITH THE TWR INDICATED THAT IT WAS A SYS ERROR.

Narrative: WHILE CONDUCTING A TRAINING FLT AT JEFFERSON COUNTY ARPT, CO (BJC), WE WERE CLRED TO TKOF RWY 29R BY TWR. TKOF WAS CONTINUING NORMALLY UNTIL WE CRESTED THE HUMP IN THE MIDDLE OF THE RWY. I THEN NOTICED A C206 TAXIING OPPOSITE DIRECTION DOWN THE CTR OF THE RWY, PRETTY MUCH AT THE LAST 1/3 OF THE RWY, AT WHICH TIME WE ACHIEVED ROTATION SPD VMC +5 92 MPH. CLBOUT WAS NORMAL AND IT APPEARED WE CLRED ACFT BY ABOUT 100 FT. WE INFORMED TWR AND THEY WERE APPARENTLY UNAWARE OF THE TAXIING ACFT. THE C206 DID NOT APPEAR TO TAKE EVASIVE ACTION. I CALLED TWR MGR AND GAVE STATEMENT. APPARENTLY HE RPTED IT WAS A CTLR ERROR AND THERE IS AN INVESTIGATION.

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.