Close proximity between air carrier and another aircraft on final approach.

Attributes
ACN	188088
Time
Date	199108
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	msl bound lower : 3000 msl bound upper : 3600
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
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 : 3000
ASRS Report	188088
Person 2
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 8000 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error other

Narrative:

Clearance was to descend to 3000 ft and intercept localizer runway 9R on heading 060 degree. Momentarily between clouds sighted aircraft at 12 O'clock low, less than 1 mi, inbound to 9R. Immediately reduced speed and descent rate and heard zn unreadable, garbled transmission, then another garbled transmission, (2 blocked). Finally, approach control told us to go through localizer and maintain a 030 degree heading for traffic separation and to reduce airspeed. Later vectored to ILS for landing a definite potential for a midair without the visual sighting and with possibly 1 more blocked transmission.

Original NASA ASRS Text

Title: CLOSE PROX BTWN ACR AND ANOTHER ACFT ON FINAL APCH.

Narrative: CLRNC WAS TO DSND TO 3000 FT AND INTERCEPT LOC RWY 9R ON HDG 060 DEG. MOMENTARILY BTWN CLOUDS SIGHTED ACFT AT 12 O'CLOCK LOW, LESS THAN 1 MI, INBOUND TO 9R. IMMEDIATELY REDUCED SPD AND DSCNT RATE AND HEARD ZN UNREADABLE, GARBLED XMISSION, THEN ANOTHER GARBLED XMISSION, (2 BLOCKED). FINALLY, APCH CTL TOLD US TO GO THROUGH LOC AND MAINTAIN A 030 DEG HDG FOR TFC SEPARATION AND TO REDUCE AIRSPD. LATER VECTORED TO ILS FOR LNDG A DEFINITE POTENTIAL FOR A MIDAIR WITHOUT THE VISUAL SIGHTING AND WITH POSSIBLY 1 MORE BLOCKED XMISSION.

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.