An mdt crew, taxiing for takeoff at mdw, feared a wrong turn was made causing a taxiway incursion.

Attributes
ACN	540812
Time
Date	200203
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : 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 : 90 flight time total : 3365 flight time type : 1850
ASRS Report	540812
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	incursion : taxiway non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Airport Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At mdw with taxi instructions from gate to runway 13L, with specific instructions to hold short of runway 13L. As we were taxiing west on taxiway north, we were told by mdw ground to cross runway 13L and hold short of runway 13C via taxiway west. We crossed runway 13L straight across on taxiway north, then a right turn up to taxiway west, and then held short of runway 13C. Mdw ground never said we did anything wrong and there was no other traffic on the ground near our aircraft. We believe ground maybe wanted us to turn right on runway 13L then a left on taxiway west. If a mistake was made, I believe it was because taxiway west was not depicted on this diagram between runway 13L and runway 13C.

Original NASA ASRS Text

Title: AN MDT CREW, TAXIING FOR TKOF AT MDW, FEARED A WRONG TURN WAS MADE CAUSING A TXWY INCURSION.

Narrative: AT MDW WITH TAXI INSTRUCTIONS FROM GATE TO RWY 13L, WITH SPECIFIC INSTRUCTIONS TO HOLD SHORT OF RWY 13L. AS WE WERE TAXIING W ON TXWY N, WE WERE TOLD BY MDW GND TO CROSS RWY 13L AND HOLD SHORT OF RWY 13C VIA TXWY W. WE CROSSED RWY 13L STRAIGHT ACROSS ON TXWY N, THEN A R TURN UP TO TXWY W, AND THEN HELD SHORT OF RWY 13C. MDW GND NEVER SAID WE DID ANYTHING WRONG AND THERE WAS NO OTHER TFC ON THE GND NEAR OUR ACFT. WE BELIEVE GND MAYBE WANTED US TO TURN R ON RWY 13L THEN A L ON TXWY W. IF A MISTAKE WAS MADE, I BELIEVE IT WAS BECAUSE TXWY W WAS NOT DEPICTED ON THIS DIAGRAM BTWN RWY 13L AND RWY 13C.

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.