Crj captain failed to follow taxi clearance after misinterpreting airport diagram.

Attributes
ACN	832435
Time
Date	200904
Local Time Of Day	1201-1800
Place
Locale Reference	MKE.Airport
State Reference	WI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Commercial
Experience	Flight Crew Last 90 Days 59 Flight Crew Total 7746 Flight Crew Type 2684
Events
Anomaly	Deviation - Procedural Clearance Ground Incursion Taxiway

Narrative:

We were issued taxi instructions to runway 7R via taxiways B and a. Taxiway B is the outer edge of the ramp area. When I looked at our taxi diagram; it appeared that taxiway B ended at a deice pad with no connection to taxiway a at the end. I taxied the aircraft from the ramp and entered taxiway a at intersection A1 believing that the few feet of taxiing on taxiway B was what the controller was referring to in our clearance. Once on taxiway a; the controller pointed out that taxiway B was to our right and to continue via taxiway a to the runway. Upon double-checking the airport diagram; I noted that taxiway B did indeed join taxiway a; but the junction was obscured from view by the deicing box on our charts. In the future; I will more carefully examine the taxi diagram if there is any writing that obscures my taxi path on the chart.

Original NASA ASRS Text

Title: CRJ Captain failed to follow taxi clearance after misinterpreting airport diagram.

Narrative: We were issued taxi instructions to Runway 7R via Taxiways B and A. Taxiway B is the outer edge of the ramp area. When I looked at our taxi diagram; it appeared that Taxiway B ended at a deice pad with no connection to Taxiway A at the end. I taxied the aircraft from the ramp and entered Taxiway A at Intersection A1 believing that the few feet of taxiing on Taxiway B was what the Controller was referring to in our clearance. Once on Taxiway A; the Controller pointed out that Taxiway B was to our right and to continue via Taxiway A to the runway. Upon double-checking the airport diagram; I noted that Taxiway B did indeed join Taxiway A; but the junction was obscured from view by the deicing box on our charts. In the future; I will more carefully examine the taxi diagram if there is any writing that obscures my taxi path on the chart.

Data retrieved from NASA's ASRS site as of April 2012 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.