B733 crew taxied past the hold short line to their takeoff runway without a clearance.

Attributes
ACN	494830
Time
Date	200012
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 5000
ASRS Report	494830
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 4800 flight time type : 1700
ASRS Report	494830
Events
Anomaly	incursion : runway non adherence : published procedure non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Clearance to taxi to runway 8 via taxiway M received and acknowledged. Ground changed us to tower frequency. Many times I have been cleared to taxi to runway 8 via taxiway left. This routing requires a right turn then a left turn to get to the runway. Clearance via taxiway M is a straight shot onto runway. First officer was looking down to do his duties and I was starting to make turn to the right thinking that I had to then turn left to get onto runway when I realized that I was crossing the hold short line. Nose of aircraft across line when we stopped. No aircraft on final. Tower then gave us clearance to depart. Supplemental information from acn 495994: I was reaching for PA microphone to warn flight attendants for takeoff as captain was initiating a right turn. We both realized at the same time that the nose of the aircraft had crossed the hold short line, at which time the captain abruptly stopped.

Original NASA ASRS Text

Title: B733 CREW TAXIED PAST THE HOLD SHORT LINE TO THEIR TKOF RWY WITHOUT A CLRNC.

Narrative: CLRNC TO TAXI TO RWY 8 VIA TXWY M RECEIVED AND ACKNOWLEDGED. GND CHANGED US TO TWR FREQ. MANY TIMES I HAVE BEEN CLRED TO TAXI TO RWY 8 VIA TXWY L. THIS ROUTING REQUIRES A R TURN THEN A L TURN TO GET TO THE RWY. CLRNC VIA TXWY M IS A STRAIGHT SHOT ONTO RWY. FO WAS LOOKING DOWN TO DO HIS DUTIES AND I WAS STARTING TO MAKE TURN TO THE R THINKING THAT I HAD TO THEN TURN L TO GET ONTO RWY WHEN I REALIZED THAT I WAS XING THE HOLD SHORT LINE. NOSE OF ACFT ACROSS LINE WHEN WE STOPPED. NO ACFT ON FINAL. TWR THEN GAVE US CLRNC TO DEPART. SUPPLEMENTAL INFO FROM ACN 495994: I WAS REACHING FOR PA MIKE TO WARN FLT ATTENDANTS FOR TKOF AS CAPT WAS INITIATING A R TURN. WE BOTH REALIZED AT THE SAME TIME THAT THE NOSE OF THE ACFT HAD CROSSED THE HOLD SHORT LINE, AT WHICH TIME THE CAPT ABRUPTLY STOPPED.

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.