DC9-50 flight crew questions controller when cleared to intercept localizer when other aircraft received the same clearance.

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Attributes
ACN	442030
Time
Date	199907
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : ord.vor
State Reference	IL
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 50
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 27l
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors arrival star : pullman 4
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 27l
Flight Phase	descent : approach
Route In Use	approach : instrument non precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 160 flight time total : 5600 flight time type : 600
ASRS Report	442030
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : returned to intended or assigned course
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Executing the pullman 4 arrival at ord. Approach controller told us after pivot, fly heading 180 degrees vectors for final runway 27L. Read back clearance, confirmed by PF. Level at 5000 ft, told to descend, maintain 3000 ft, right heading 240 degrees to intercept runway 27L localizer. Saw that we had traffic at 12 O'clock, a DC10, also lining up for runway 27L final, 1000 ft above us about 1-2 mi ahead. Called approach to doublechk our clearance. Told us we were supposed to be for runway 27R. We were in VMC, called the traffic in sight and the airport, sidestepped to runway 27R about 7 mi out and landed. Nothing else was heard from ATC. Factors that may have produced misunderstanding: busy airspace, arrival push from west. Discovered problem when DC10 appeared too close, luckily we were in VMC.

Original NASA ASRS Text

Title: DC9-50 FLC QUESTIONS CTLR WHEN CLRED TO INTERCEPT LOC WHEN OTHER ACFT RECEIVED THE SAME CLRNC.

Narrative: EXECUTING THE PULLMAN 4 ARR AT ORD. APCH CTLR TOLD US AFTER PIVOT, FLY HDG 180 DEGS VECTORS FOR FINAL RWY 27L. READ BACK CLRNC, CONFIRMED BY PF. LEVEL AT 5000 FT, TOLD TO DSND, MAINTAIN 3000 FT, R HDG 240 DEGS TO INTERCEPT RWY 27L LOC. SAW THAT WE HAD TFC AT 12 O'CLOCK, A DC10, ALSO LINING UP FOR RWY 27L FINAL, 1000 FT ABOVE US ABOUT 1-2 MI AHEAD. CALLED APCH TO DOUBLECHK OUR CLRNC. TOLD US WE WERE SUPPOSED TO BE FOR RWY 27R. WE WERE IN VMC, CALLED THE TFC IN SIGHT AND THE ARPT, SIDESTEPPED TO RWY 27R ABOUT 7 MI OUT AND LANDED. NOTHING ELSE WAS HEARD FROM ATC. FACTORS THAT MAY HAVE PRODUCED MISUNDERSTANDING: BUSY AIRSPACE, ARR PUSH FROM W. DISCOVERED PROB WHEN DC10 APPEARED TOO CLOSE, LUCKILY WE WERE IN VMC.

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.