Pilot of a C172 failed to follow the tower ground controller's taxi instructions resulting in an air carrier bus colliding with the wing of his aircraft when it turned off the vehicle road on which the reporter had mistaken for the taxiway. Wingtip damage only.

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Attributes
ACN	380969
Time
Date	199709
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 40 flight time total : 530 flight time type : 400
ASRS Report	380969
Person 2
Affiliation	company : air carrier
Function	other personnel
Qualification	other other : other
Events
Anomaly	conflict : ground critical non adherence : clearance other anomaly other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After landing on runway 22 at ord I was taxiing under direction of ground. I taxied past an air carrier X bus. When I was almost past the end of the stopped bus it moved ahead and to the right causing the left rear of the bus to swing toward my plane and strike the end of the left wing. The ground controller had asked whether I had ever been at O'hare before. When he learned that I had not he told me 'don't worry, I'll be watching you.' he had directed me from taxiway P to taxiway a to taxiway A18 to taxiway D to FBO. At taxiway A18 he told me to stop for two air carrier X planes which I did. He said proceed to taxiway D and turn left which I did. Apparently I mistook a roadway in front of me which went to taxiway D for taxiway A18 which went to my right and then curved back to the left to taxiway D. I was on the roadway passing the bus when it swung its left rear around and hit my airplane. The markings and layout for taxiway A18 was very confusing. The controller took his eyes off me and the bus driver should not have moved until it was safe to do so.

Original NASA ASRS Text

Title: PLT OF A C172 FAILED TO FOLLOW THE TWR GND CTLR'S TAXI INSTRUCTIONS RESULTING IN AN ACR BUS COLLIDING WITH THE WING OF HIS ACFT WHEN IT TURNED OFF THE VEHICLE ROAD ON WHICH THE RPTR HAD MISTAKEN FOR THE TXWY. WINGTIP DAMAGE ONLY.

Narrative: AFTER LNDG ON RWY 22 AT ORD I WAS TAXIING UNDER DIRECTION OF GND. I TAXIED PAST AN ACR X BUS. WHEN I WAS ALMOST PAST THE END OF THE STOPPED BUS IT MOVED AHEAD AND TO THE R CAUSING THE L REAR OF THE BUS TO SWING TOWARD MY PLANE AND STRIKE THE END OF THE L WING. THE GND CTLR HAD ASKED WHETHER I HAD EVER BEEN AT O'HARE BEFORE. WHEN HE LEARNED THAT I HAD NOT HE TOLD ME 'DON'T WORRY, I'LL BE WATCHING YOU.' HE HAD DIRECTED ME FROM TXWY P TO TXWY A TO TXWY A18 TO TXWY D TO FBO. AT TXWY A18 HE TOLD ME TO STOP FOR TWO ACR X PLANES WHICH I DID. HE SAID PROCEED TO TXWY D AND TURN L WHICH I DID. APPARENTLY I MISTOOK A ROADWAY IN FRONT OF ME WHICH WENT TO TXWY D FOR TXWY A18 WHICH WENT TO MY R AND THEN CURVED BACK TO THE L TO TXWY D. I WAS ON THE ROADWAY PASSING THE BUS WHEN IT SWUNG ITS L REAR AROUND AND HIT MY AIRPLANE. THE MARKINGS AND LAYOUT FOR TXWY A18 WAS VERY CONFUSING. THE CTLR TOOK HIS EYES OFF ME AND THE BUS DRIVER SHOULD NOT HAVE MOVED UNTIL IT WAS SAFE TO DO SO.

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.