Light transport on taxi barely held short of takeoff runway as medium large transport took off.

Attributes
ACN	101833
Time
Date	198901
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tower : pdx
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 7150 flight time type : 2600
ASRS Report	101833
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On taxiout from corp parking area at den I mistook an aircraft back-taxiing on a runway for the taxiway I was cleared to taxi on. As I continued my taxi toward the runway the ground controller told me to stop. I stopped using maximum braking effort short of the runway as an medium large transport was departing on takeoff roll. I was instructed to make a 180 degree turn and taxi via the correct taxiway to the active departure runway 8L. No further incidents occurred. If the controller had not told me to stop I would have conflicted with the medium large transport. At the time of the incident I had flown 5.6 hours that evening already. If I had consulted the ground chart I would not have assumed I was headed for the correct taxiway. Normally we depart on 35L--my taxi-out takes me onto that taxiway. Taking time to review the ground chart and listening more closely to the instructions given by the controller and paying more attention to what I was doing would have prevented this almost tragic mistake from happening.

Original NASA ASRS Text

Title: LTT ON TAXI BARELY HELD SHORT OF TKOF RWY AS MLG TOOK OFF.

Narrative: ON TAXIOUT FROM CORP PARKING AREA AT DEN I MISTOOK AN ACFT BACK-TAXIING ON A RWY FOR THE TXWY I WAS CLRED TO TAXI ON. AS I CONTINUED MY TAXI TOWARD THE RWY THE GND CTLR TOLD ME TO STOP. I STOPPED USING MAX BRAKING EFFORT SHORT OF THE RWY AS AN MLG WAS DEPARTING ON TKOF ROLL. I WAS INSTRUCTED TO MAKE A 180 DEG TURN AND TAXI VIA THE CORRECT TXWY TO THE ACTIVE DEP RWY 8L. NO FURTHER INCIDENTS OCCURRED. IF THE CTLR HAD NOT TOLD ME TO STOP I WOULD HAVE CONFLICTED WITH THE MLG. AT THE TIME OF THE INCIDENT I HAD FLOWN 5.6 HRS THAT EVENING ALREADY. IF I HAD CONSULTED THE GND CHART I WOULD NOT HAVE ASSUMED I WAS HEADED FOR THE CORRECT TXWY. NORMALLY WE DEPART ON 35L--MY TAXI-OUT TAKES ME ONTO THAT TXWY. TAKING TIME TO REVIEW THE GND CHART AND LISTENING MORE CLOSELY TO THE INSTRUCTIONS GIVEN BY THE CTLR AND PAYING MORE ATTN TO WHAT I WAS DOING WOULD HAVE PREVENTED THIS ALMOST TRAGIC MISTAKE FROM HAPPENING.

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.