B737 crew had runway incursion on taxi out.

Attributes
ACN	419299
Time
Date	199811
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : chs airport : chs
State Reference	SC
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	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 210 flight time total : 21000 flight time type : 6000
ASRS Report	419299
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 18000 flight time type : 10000
ASRS Report	419600
Events
Anomaly	incursion : runway non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation Pilot Deviation
Situations
ATC Facility	other physical facility procedure or policy : unspecified

Narrative:

On taxi out to runway 15, ground controller asked why we taxied past runway 21. We thought we were cleared to runway 15 for takeoff. Apparently ground had cleared us to runway 21 and we 'thought' it was to runway 15 because: we landed on runway 15. Runway 15 was in continual use during our turn around at the gate. Our weight and balance figures were for runway 15. Was cleared to taxi to runway 15 during our ground operation. Ground control's original instruction to us faded out and the part we missed (when it was read back) turned out to be 'hold short of runway 15,' so we were focused on that. Runway 15 or runway 33 was the expected departure runway since it is 9000 ft long vice 7000 ft long for runway 21 (which is normally not used) and the wind was variable at 4 KTS. We just didn't hear '21.' no conflict resulted, no evasive action was required. Supplemental information from acn 419600: ground controller issued taxi instructions to us twice because both myself and first officer did not receive clearly. Something was lost on each of the xmissions. The controller said we were cleared to runway 21, but we did not hear at all of clearly on readback.

Original NASA ASRS Text

Title: B737 CREW HAD RWY INCURSION ON TAXI OUT.

Narrative: ON TAXI OUT TO RWY 15, GND CTLR ASKED WHY WE TAXIED PAST RWY 21. WE THOUGHT WE WERE CLRED TO RWY 15 FOR TKOF. APPARENTLY GND HAD CLRED US TO RWY 21 AND WE 'THOUGHT' IT WAS TO RWY 15 BECAUSE: WE LANDED ON RWY 15. RWY 15 WAS IN CONTINUAL USE DURING OUR TURN AROUND AT THE GATE. OUR WT AND BAL FIGURES WERE FOR RWY 15. WAS CLRED TO TAXI TO RWY 15 DURING OUR GND OP. GND CTL'S ORIGINAL INSTRUCTION TO US FADED OUT AND THE PART WE MISSED (WHEN IT WAS READ BACK) TURNED OUT TO BE 'HOLD SHORT OF RWY 15,' SO WE WERE FOCUSED ON THAT. RWY 15 OR RWY 33 WAS THE EXPECTED DEP RWY SINCE IT IS 9000 FT LONG VICE 7000 FT LONG FOR RWY 21 (WHICH IS NORMALLY NOT USED) AND THE WIND WAS VARIABLE AT 4 KTS. WE JUST DIDN'T HEAR '21.' NO CONFLICT RESULTED, NO EVASIVE ACTION WAS REQUIRED. SUPPLEMENTAL INFO FROM ACN 419600: GND CTLR ISSUED TAXI INSTRUCTIONS TO US TWICE BECAUSE BOTH MYSELF AND FO DID NOT RECEIVE CLRLY. SOMETHING WAS LOST ON EACH OF THE XMISSIONS. THE CTLR SAID WE WERE CLRED TO RWY 21, BUT WE DID NOT HEAR AT ALL OF CLRLY ON READBACK.

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.