Taxiing aircraft had miscom, misheard tower instructions, and thinking they were cleared across runway started across, but stopped with aircraft nose on runway edge. Review with tower didn't resolve what was said and heard.

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Attributes
ACN	324600
Time
Date	199601
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 16500 flight time type : 2000
ASRS Report	324600
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	incursion : runway non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Thought we were cleared to taxi across runway 30L at stl but we misunderstood controller and were not cleared to cross runway. Passed hold line and stopped with aircraft nose on runway edge white line. We should have clarified ATC instructions before proceeding. We heard 'papa' as 'alpha.' telecon with tower said they weren't sure what was said by who either. Will ask for more clarification in future.

Original NASA ASRS Text

Title: TAXIING ACFT HAD MISCOM, MISHEARD TWR INSTRUCTIONS, AND THINKING THEY WERE CLRED ACROSS RWY STARTED ACROSS, BUT STOPPED WITH ACFT NOSE ON RWY EDGE. REVIEW WITH TWR DIDN'T RESOLVE WHAT WAS SAID AND HEARD.

Narrative: THOUGHT WE WERE CLRED TO TAXI ACROSS RWY 30L AT STL BUT WE MISUNDERSTOOD CTLR AND WERE NOT CLRED TO CROSS RWY. PASSED HOLD LINE AND STOPPED WITH ACFT NOSE ON RWY EDGE WHITE LINE. WE SHOULD HAVE CLARIFIED ATC INSTRUCTIONS BEFORE PROCEEDING. WE HEARD 'PAPA' AS 'ALPHA.' TELECON WITH TWR SAID THEY WEREN'T SURE WHAT WAS SAID BY WHO EITHER. WILL ASK FOR MORE CLARIFICATION IN FUTURE.

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.