Aircraft on final approach came in close proximity to each other.

Attributes
ACN	113120
Time
Date	198906
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 5500 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : stl tower : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	arrival other
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 descent other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 16000 flight time type : 2000
ASRS Report	113120
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 5500 flight time type : 620
ASRS Report	113307
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 500 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

ATC controller assigned flight to fly inbound on the runway 12L ILS localizer and aircraft were also using the 12R ILS localizer without fore/aft separation. ATIS remarks indicated that 12L traffic should use the 12L lda localizer which would give 3000' lateral separation to the left. Other factor was limited ability of crew to transmit on approach control frequency due to continuous use by approach and runway 12R traffic being on another approach frequency. Finally broke into xmissions to announce 'a dangerous situation' existed and that we could not descend to land. Given 90 degree turn to left by controller for resequence. Supplemental information from acn 113307: we were at 6000' and had an air carrier on our right for 12R. I was cleared to 5500' and had I descended we would have been in serious conflict.

Original NASA ASRS Text

Title: ACFT ON FINAL APCH CAME IN CLOSE PROX TO EACH OTHER.

Narrative: ATC CTLR ASSIGNED FLT TO FLY INBND ON THE RWY 12L ILS LOC AND ACFT WERE ALSO USING THE 12R ILS LOC WITHOUT FORE/AFT SEPARATION. ATIS REMARKS INDICATED THAT 12L TFC SHOULD USE THE 12L LDA LOC WHICH WOULD GIVE 3000' LATERAL SEPARATION TO THE LEFT. OTHER FACTOR WAS LIMITED ABILITY OF CREW TO XMIT ON APCH CTL FREQ DUE TO CONTINUOUS USE BY APCH AND RWY 12R TFC BEING ON ANOTHER APCH FREQ. FINALLY BROKE INTO XMISSIONS TO ANNOUNCE 'A DANGEROUS SITUATION' EXISTED AND THAT WE COULD NOT DSND TO LAND. GIVEN 90 DEG TURN TO LEFT BY CTLR FOR RESEQUENCE. SUPPLEMENTAL INFORMATION FROM ACN 113307: WE WERE AT 6000' AND HAD AN ACR ON OUR RIGHT FOR 12R. I WAS CLRED TO 5500' AND HAD I DESCENDED WE WOULD HAVE BEEN IN SERIOUS CONFLICT.

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.