A B757-200 crew reports erratic track deviations on the ord bradford 3 (BDF3) arrival. ATC stated that several aircraft have experienced this deviation.

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Attributes
ACN	678189
Time
Date	200511
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : benky
State Reference	IL
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival star : bdf
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	678189
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued alert none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Chart Or Publication Navigational Facility
Primary Problem	Chart Or Publication

Narrative:

On bradford arrival over benke intersection; chicago approach asked if we showed that we were on course. As the first officer and PNF and the navigation display showed us on course; I replied; 'affirmative' and asked if he showed us on course. Approach replied that he showed us 7 mi south of course and that there seemed to be a problem with B757 and airbus aircraft with the bradford arrival. We landed normally and the IRS drift limit was not exceeded during the parking checklist.

Original NASA ASRS Text

Title: A B757-200 CREW RPTS ERRATIC TRACK DEVS ON THE ORD BRADFORD 3 (BDF3) ARR. ATC STATED THAT SEVERAL ACFT HAVE EXPERIENCED THIS DEV.

Narrative: ON BRADFORD ARR OVER BENKE INTXN; CHICAGO APCH ASKED IF WE SHOWED THAT WE WERE ON COURSE. AS THE FO AND PNF AND THE NAV DISPLAY SHOWED US ON COURSE; I REPLIED; 'AFFIRMATIVE' AND ASKED IF HE SHOWED US ON COURSE. APCH REPLIED THAT HE SHOWED US 7 MI S OF COURSE AND THAT THERE SEEMED TO BE A PROB WITH B757 AND AIRBUS ACFT WITH THE BRADFORD ARR. WE LANDED NORMALLY AND THE IRS DRIFT LIMIT WAS NOT EXCEEDED DURING THE PARKING CHKLIST.

Data retrieved from NASA's ASRS site as of January 2009 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.