Pilot of atx cleared to 22R at mdw crossed 22R and held short of 22L.

Attributes
ACN	129830
Time
Date	198912
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : takeoff ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 260 flight time total : 2505 flight time type : 575
ASRS Report	129830
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other other : unspecified cockpit
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was told by ground control to taxi from the west side FBO to runway 22R. This was to be via txwys whiskey and november. (These are the west and north perimeter txwys.) I was not familiar with the northeast corner of the airport. As a result, I taxied across the displaced threshold of 22R and stopped short of 22L. I thought I was at 22R. Mdw tower asked me if I was at runway 22R. I answered that I thought so. However, I then realized I was actually at 22L, and I informed the tower of this. The tower then cleared me for takeoff on 22L and said nothing else about the matter. Other pilots have also mentioned that mdw txwys are confusing, and they have also made or nearly made similar mistakes. I did not cross an active runway, so I do not think my mistake caused any problems. However, this might not be the case for others in the future. In order to prevent this problem, I would recommend that pilots unfamiliar with mdw txwys get progressive taxi instructions from ground control.

Original NASA ASRS Text

Title: PLT OF ATX CLEARED TO 22R AT MDW CROSSED 22R AND HELD SHORT OF 22L.

Narrative: I WAS TOLD BY GND CTL TO TAXI FROM THE W SIDE FBO TO RWY 22R. THIS WAS TO BE VIA TXWYS WHISKEY AND NOVEMBER. (THESE ARE THE W AND N PERIMETER TXWYS.) I WAS NOT FAMILIAR WITH THE NE CORNER OF THE ARPT. AS A RESULT, I TAXIED ACROSS THE DISPLACED THRESHOLD OF 22R AND STOPPED SHORT OF 22L. I THOUGHT I WAS AT 22R. MDW TWR ASKED ME IF I WAS AT RWY 22R. I ANSWERED THAT I THOUGHT SO. HOWEVER, I THEN REALIZED I WAS ACTUALLY AT 22L, AND I INFORMED THE TWR OF THIS. THE TWR THEN CLRED ME FOR TKOF ON 22L AND SAID NOTHING ELSE ABOUT THE MATTER. OTHER PLTS HAVE ALSO MENTIONED THAT MDW TXWYS ARE CONFUSING, AND THEY HAVE ALSO MADE OR NEARLY MADE SIMILAR MISTAKES. I DID NOT CROSS AN ACTIVE RWY, SO I DO NOT THINK MY MISTAKE CAUSED ANY PROBLEMS. HOWEVER, THIS MIGHT NOT BE THE CASE FOR OTHERS IN THE FUTURE. IN ORDER TO PREVENT THIS PROBLEM, I WOULD RECOMMEND THAT PLTS UNFAMILIAR WITH MDW TXWYS GET PROGRESSIVE TAXI INSTRUCTIONS FROM GND CTL.

Data retrieved from NASA's ASRS site as of August 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.