Near midair collision between aircraft on approach to parallel runways.

Attributes
ACN	110937
Time
Date	198905
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : straight in arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 8250 flight time type : 600
ASRS Report	110937
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : returned to intended course or assigned course none taken : unable
Consequence	Other
Miss Distance	horizontal : 500 vertical : 0
Supplementary
Primary Problem	Ambiguous

Narrative:

We were being vectored for the visibility to 9L to follow an mdt which we had in sight. After a base heading of 180 degrees we were issued a turn to 120 degrees to intercept 9L and were advised of traffic a 12 O'clock on the parallel to 9R. We had this traffic on medium large transport in sight at our altitude. We had to use bank angles up to 45 degrees and even that put us through 9L and onto 9R centerline, as he was directly behind us. It was obvious we were very close. We were not cleared for the visibility until after we were issued the heading to intercept 9L. We also had been level at 7000' on the downwind leg and were issued a clearance to 3000'. We should not be given crossing or same altitudes when being vectored for visibility parallel approachs until securely established on appropriate runway centerline.

Original NASA ASRS Text

Title: NMAC BETWEEN ACFT ON APCH TO PARALLEL RWYS.

Narrative: WE WERE BEING VECTORED FOR THE VIS TO 9L TO FOLLOW AN MDT WHICH WE HAD IN SIGHT. AFTER A BASE HDG OF 180 DEGS WE WERE ISSUED A TURN TO 120 DEGS TO INTERCEPT 9L AND WERE ADVISED OF TFC A 12 O'CLOCK ON THE PARALLEL TO 9R. WE HAD THIS TFC ON MLG IN SIGHT AT OUR ALT. WE HAD TO USE BANK ANGLES UP TO 45 DEGS AND EVEN THAT PUT US THROUGH 9L AND ONTO 9R CENTERLINE, AS HE WAS DIRECTLY BEHIND US. IT WAS OBVIOUS WE WERE VERY CLOSE. WE WERE NOT CLRED FOR THE VIS UNTIL AFTER WE WERE ISSUED THE HDG TO INTERCEPT 9L. WE ALSO HAD BEEN LEVEL AT 7000' ON THE DOWNWIND LEG AND WERE ISSUED A CLRNC TO 3000'. WE SHOULD NOT BE GIVEN XING OR SAME ALTS WHEN BEING VECTORED FOR VIS PARALLEL APCHS UNTIL SECURELY ESTABLISHED ON APPROPRIATE RWY CENTERLINE.

Data retrieved from NASA's ASRS site as of August 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.