An medium large transport air carrier crew taxied without proper clearance.

Attributes
ACN	210682
Time
Date	199205
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bwi
State Reference	MD
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	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 105 flight time total : 8700 flight time type : 1500
ASRS Report	210682
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance non adherence other other anomaly other
Independent Detector	other other : unspecified atc
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

We had just started up after pushback from gate at bwi. No other traffic was moving on this side of the terminal except one light transport that was moving onto taxiway 'B' well ahead (200 yds) of us. There wasn't much radio traffic on ground control (120.2), but the controller (and one other pilot) were stepping on a lot of xmissions (I think the ground controller was working another ground control frequency -- this contributed to the problem). We made several calls to ground that were either stepped on or just ignored, finally we got what we thought was a clearance to taxi onto 'B'. In retrospect this must have been for the light transport in front of us, we moved out onto 'B' (absolutely no conflict with any other traffic) when we acknowledged the controller said 'I don't want you on a taxiway without a clearance again' in a rather snide tone. Conclusions: we may have been out on 'B' without a clearance, but it certainly wasn't apparent. Next time we'll just stay put until sure. Controller should have done a better job working 2 frequencys. His mismgmnt greatly contributed to this misunderstanding. Controller really overreacted to our being on what is essentially an extension of our own ramp. This necessitates what is mostly a 'cya' report.

Original NASA ASRS Text

Title: AN MLG ACR CREW TAXIED WITHOUT PROPER CLRNC.

Narrative: WE HAD JUST STARTED UP AFTER PUSHBACK FROM GATE AT BWI. NO OTHER TFC WAS MOVING ON THIS SIDE OF THE TERMINAL EXCEPT ONE LTT THAT WAS MOVING ONTO TAXIWAY 'B' WELL AHEAD (200 YDS) OF US. THERE WASN'T MUCH RADIO TFC ON GND CTL (120.2), BUT THE CTLR (AND ONE OTHER PLT) WERE STEPPING ON A LOT OF XMISSIONS (I THINK THE GND CTLR WAS WORKING ANOTHER GND CTL FREQ -- THIS CONTRIBUTED TO THE PROBLEM). WE MADE SEVERAL CALLS TO GND THAT WERE EITHER STEPPED ON OR JUST IGNORED, FINALLY WE GOT WHAT WE THOUGHT WAS A CLRNC TO TAXI ONTO 'B'. IN RETROSPECT THIS MUST HAVE BEEN FOR THE LTT IN FRONT OF US, WE MOVED OUT ONTO 'B' (ABSOLUTELY NO CONFLICT WITH ANY OTHER TFC) WHEN WE ACKNOWLEDGED THE CTLR SAID 'I DON'T WANT YOU ON A TAXIWAY WITHOUT A CLRNC AGAIN' IN A RATHER SNIDE TONE. CONCLUSIONS: WE MAY HAVE BEEN OUT ON 'B' WITHOUT A CLRNC, BUT IT CERTAINLY WASN'T APPARENT. NEXT TIME WE'LL JUST STAY PUT UNTIL SURE. CTLR SHOULD HAVE DONE A BETTER JOB WORKING 2 FREQS. HIS MISMGMNT GREATLY CONTRIBUTED TO THIS MISUNDERSTANDING. CTLR REALLY OVERREACTED TO OUR BEING ON WHAT IS ESSENTIALLY AN EXTENSION OF OUR OWN RAMP. THIS NECESSITATES WHAT IS MOSTLY A 'CYA' RPT.

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.