Near midair collision.

Attributes
ACN	254854
Time
Date	199310
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : stl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Route In Use	approach : straight in
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : visual enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 17000 flight time type : 800
ASRS Report	254854
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 250 flight time total : 8000 flight time type : 3200
ASRS Report	254742
Events
Anomaly	altitude deviation : undershoot conflict : nmac non adherence : clearance non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight was proceeding under stl radar approach control. WX was VMC. We were established on runway 30R localizer at 5000 ft. We then received a clearance to descend to 3500 ft. As the aircraft descended through approximately 4000 ft we received a TCASII RA to 'climb.' while executing the escape maneuver we noticed a red symbol directly under the aircraft symbol on the ivsi with a separation notation of '00' ft. Shortly after initiating our climb captain observed an light transport slowly diverging from the left side of our aircraft and directly abeam, but now below us. At the same time we received a 'clear of conflict' advisory. We immediately advised the controller we had received an RA and had complied with TCASII commands to climb. The controller then advised us we had light transport traffic off our left on approach to runway 30L and then cleared us for visual approach to runway 30R. The remainder of the approach and landing was uneventful. After landing, captain contacted supervisor at stl TRACON and was advised that at the time of the incident in question the light transport had been proceeding on a visual approach clearance to runway 30L. He further stated this aircraft had reported us in sight and had been instructed to maintain visual separation.

Original NASA ASRS Text

Title: NMAC.

Narrative: FLT WAS PROCEEDING UNDER STL RADAR APCH CTL. WX WAS VMC. WE WERE ESTABLISHED ON RWY 30R LOC AT 5000 FT. WE THEN RECEIVED A CLRNC TO DSND TO 3500 FT. AS THE ACFT DSNDED THROUGH APPROX 4000 FT WE RECEIVED A TCASII RA TO 'CLB.' WHILE EXECUTING THE ESCAPE MANEUVER WE NOTICED A RED SYMBOL DIRECTLY UNDER THE ACFT SYMBOL ON THE IVSI WITH A SEPARATION NOTATION OF '00' FT. SHORTLY AFTER INITIATING OUR CLB CAPT OBSERVED AN LTT SLOWLY DIVERGING FROM THE L SIDE OF OUR ACFT AND DIRECTLY ABEAM, BUT NOW BELOW US. AT THE SAME TIME WE RECEIVED A 'CLR OF CONFLICT' ADVISORY. WE IMMEDIATELY ADVISED THE CTLR WE HAD RECEIVED AN RA AND HAD COMPLIED WITH TCASII COMMANDS TO CLB. THE CTLR THEN ADVISED US WE HAD LTT TFC OFF OUR L ON APCH TO RWY 30L AND THEN CLRED US FOR VISUAL APCH TO RWY 30R. THE REMAINDER OF THE APCH AND LNDG WAS UNEVENTFUL. AFTER LNDG, CAPT CONTACTED SUPVR AT STL TRACON AND WAS ADVISED THAT AT THE TIME OF THE INCIDENT IN QUESTION THE LTT HAD BEEN PROCEEDING ON A VISUAL APCH CLRNC TO RWY 30L. HE FURTHER STATED THIS ACFT HAD RPTED US IN SIGHT AND HAD BEEN INSTRUCTED TO MAINTAIN VISUAL SEPARATION.

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.