Mdt has near midair collision with small aircraft on final approach within TCA.

Attributes
ACN	229072
Time
Date	199212
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	msl bound lower : 1200 msl bound upper : 1200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : mia
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 240 flight time total : 3400 flight time type : 450
ASRS Report	229072
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 0 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Finishing up a 5 leg day. VFR, night, on IFR plan. Handed over to tower after being cleared for ILS 9R miami. TCASII on board but not operational (MEL'ed). Descending on GS. All of a sudden tower advised us on traffic that may have overshot the 9L localizer. We looked to the left for traffic, but didn't see anyone. All of a sudden I caught sight of an aircraft's strobes flying less than 150 ft below us, through the final. No action could be taken to evade the aircraft. Tower told us that the other aircraft was not talking to anyone, and had just called approach when the tower noticed the converging traffic. Small aircraft flew through the TCA and the final approach corridor and didn't bother to call anyone. Also if our TCASII would have been operational we sure would have known about him. Can't blame the tower. He had no control. ATC tracked the small aircraft to its destination.

Original NASA ASRS Text

Title: MDT HAS NMAC WITH SMA ON FINAL APCH WITHIN TCA.

Narrative: FINISHING UP A 5 LEG DAY. VFR, NIGHT, ON IFR PLAN. HANDED OVER TO TWR AFTER BEING CLRED FOR ILS 9R MIAMI. TCASII ON BOARD BUT NOT OPERATIONAL (MEL'ED). DSNDING ON GS. ALL OF A SUDDEN TWR ADVISED US ON TFC THAT MAY HAVE OVERSHOT THE 9L LOC. WE LOOKED TO THE L FOR TFC, BUT DIDN'T SEE ANYONE. ALL OF A SUDDEN I CAUGHT SIGHT OF AN ACFT'S STROBES FLYING LESS THAN 150 FT BELOW US, THROUGH THE FINAL. NO ACTION COULD BE TAKEN TO EVADE THE ACFT. TWR TOLD US THAT THE OTHER ACFT WAS NOT TALKING TO ANYONE, AND HAD JUST CALLED APCH WHEN THE TWR NOTICED THE CONVERGING TFC. SMA FLEW THROUGH THE TCA AND THE FINAL APCH CORRIDOR AND DIDN'T BOTHER TO CALL ANYONE. ALSO IF OUR TCASII WOULD HAVE BEEN OPERATIONAL WE SURE WOULD HAVE KNOWN ABOUT HIM. CAN'T BLAME THE TWR. HE HAD NO CTL. ATC TRACKED THE SMA TO ITS DEST.

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.