Air carrier X failed to comply with ATC clearance. Pilot deviation.

Attributes
ACN	145698
Time
Date	199004
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	agl bound lower : 1200 agl bound upper : 1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : initial climbout : takeoff
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 5000 flight time type : 360
ASRS Report	145698
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X was cleared 'into position and hold 22L.' shortly thereafter, 'air carrier X, turn left heading 140, cleared for takeoff 22L, will call your turn.' I questioned the captain about ATC calling our turn and he agreed that was the clearance. I read back the clearance as I heard it. As we climbed out of 1200' AGL, we were told 'turn further left heading 110 degrees. Tighten your turn.' there was air carrier Y off of 14 that we were converging with. The clearance to tighten up our turn made me think that the original clearance may have been, 'cleared for takeoff 22L left turn 140 degree heading, will call further in the air.' this was our fifth leg of a very long day and we may have made the mistake. The frequency at ord was very congested, as well.

Original NASA ASRS Text

Title: ACR X FAILED TO COMPLY WITH ATC CLRNC. PLT DEVIATION.

Narrative: ACR X WAS CLRED 'INTO POS AND HOLD 22L.' SHORTLY THEREAFTER, 'ACR X, TURN LEFT HDG 140, CLRED FOR TKOF 22L, WILL CALL YOUR TURN.' I QUESTIONED THE CAPT ABOUT ATC CALLING OUR TURN AND HE AGREED THAT WAS THE CLRNC. I READ BACK THE CLRNC AS I HEARD IT. AS WE CLBED OUT OF 1200' AGL, WE WERE TOLD 'TURN FURTHER LEFT HDG 110 DEGS. TIGHTEN YOUR TURN.' THERE WAS ACR Y OFF OF 14 THAT WE WERE CONVERGING WITH. THE CLRNC TO TIGHTEN UP OUR TURN MADE ME THINK THAT THE ORIGINAL CLRNC MAY HAVE BEEN, 'CLRED FOR TKOF 22L LEFT TURN 140 DEG HDG, WILL CALL FURTHER IN THE AIR.' THIS WAS OUR FIFTH LEG OF A VERY LONG DAY AND WE MAY HAVE MADE THE MISTAKE. THE FREQ AT ORD WAS VERY CONGESTED, AS WELL.

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.