Part 135 MU2B miscalculates turn and hold position and crosses runway, causing another part 135 aircraft to abort takeoff roll.

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Attributes
ACN	449196
Time
Date	199909
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	MU-2B 40 Solitaire
Operating Under FAR Part	Part 135
Flight Phase	ground : taxi
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : mdw.tower
Operator	common carrier : air taxi
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 135
Flight Phase	ground : takeoff roll
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp pilot : multi engine pilot : cfi
Experience	flight time last 90 days : 145 flight time total : 5800 flight time type : 1900
ASRS Report	449196
Person 2
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : published procedure non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : rejected takeoff none taken : detected after the fact
Miss Distance	horizontal : 2000 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance Airport ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

As I was taxiing to runway 31C at mdw, I missed my turn and inadvertently crossed runway 31L. Another aircraft was in the process of taking off and had to abort his takeoff roll to avoid me. Contributing factors were my fatigue due to the time of day, the darkness, and tight schedule requirements.

Original NASA ASRS Text

Title: PART 135 MU2B MISCALCULATES TURN AND HOLD POS AND CROSSES RWY, CAUSING ANOTHER PART 135 ACFT TO ABORT TKOF ROLL.

Narrative: AS I WAS TAXIING TO RWY 31C AT MDW, I MISSED MY TURN AND INADVERTENTLY CROSSED RWY 31L. ANOTHER ACFT WAS IN THE PROCESS OF TAKING OFF AND HAD TO ABORT HIS TKOF ROLL TO AVOID ME. CONTRIBUTING FACTORS WERE MY FATIGUE DUE TO THE TIME OF DAY, THE DARKNESS, AND TIGHT SCHEDULE REQUIREMENTS.

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.