An MD80 flight crew taxied past the assigned turn point at ord.

Attributes
ACN	455050
Time
Date	199911
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	455050
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	455049
Events
Anomaly	incursion : taxiway non adherence : clearance
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Clearing runway 9R, heard taxi clearance of taxiway M5-D to taxiway H-17, which made sense because taxiway D intersects the inner near ramp entry point to taxiway H-17. What controller actually said was taxiway M5- D A-17. I stopped the airplane at taxiway A-16 on taxiway D just short of the inner. Ground control queried me as to why I had gone by taxiway A-17. It was then that I realized I had copied the clearance wrong. A short taxi and requirement for first officer to verify both on the ground call and arrival at ramp left little time to verify one letter difference in taxi clearance.

Original NASA ASRS Text

Title: AN MD80 FLC TAXIED PAST THE ASSIGNED TURN POINT AT ORD.

Narrative: CLRING RWY 9R, HEARD TAXI CLRNC OF TXWY M5-D TO TXWY H-17, WHICH MADE SENSE BECAUSE TXWY D INTERSECTS THE INNER NEAR RAMP ENTRY POINT TO TXWY H-17. WHAT CTLR ACTUALLY SAID WAS TXWY M5- D A-17. I STOPPED THE AIRPLANE AT TXWY A-16 ON TXWY D JUST SHORT OF THE INNER. GND CTL QUERIED ME AS TO WHY I HAD GONE BY TXWY A-17. IT WAS THEN THAT I REALIZED I HAD COPIED THE CLRNC WRONG. A SHORT TAXI AND REQUIREMENT FOR FO TO VERIFY BOTH ON THE GND CALL AND ARR AT RAMP LEFT LITTLE TIME TO VERIFY ONE LETTER DIFFERENCE IN TAXI CLRNC.

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.