An IFR GA aircraft on an NDB approach to sgr is issued unknown traffic converging course. The pilot observed a C172 at the last min at same altitude at 9 O'clock position and took evasive action to miss the aircraft. Aircraft passed each other by approximately 150 ft. The C172 supposedly was operating in IMC conditions without clearance or beacon code.

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Attributes
ACN	355855
Time
Date	199612
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : hou airport : sgr
State Reference	TX
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iah
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
ASRS Report	355855
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action none taken : unable
Consequence	Other
Miss Distance	horizontal : 150 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I had been vectored to the inbound leg for an NDB approach to sugarland houston at 2000 ft when houston approach called a TA at 10 O'clock less than a mi. The ceiling was 1700 ft broken. A quick scan revealed nothing and when I reported negative contact the controller suggested the traffic may have passed behind me. I looked at 9 O'clock and there was a C172 coming directly at me. He pulled up and towards my tail and I nosed down and to the right. There was probably no more than 50 yards between us at the closest point. I continued the approach, advised the controller at which time he turned me over to the tower and I completed the approach. The other plane was below the class B airspace and didn't have VMC, nor was he squawking or talking on the approach end of a busy airport, nor did he properly yield to the aircraft on his right. Guess I'm just lucky.

Original NASA ASRS Text

Title: AN IFR GA ACFT ON AN NDB APCH TO SGR IS ISSUED UNKNOWN TFC CONVERGING COURSE. THE PLT OBSERVED A C172 AT THE LAST MIN AT SAME ALT AT 9 O'CLOCK POS AND TOOK EVASIVE ACTION TO MISS THE ACFT. ACFT PASSED EACH OTHER BY APPROX 150 FT. THE C172 SUPPOSEDLY WAS OPERATING IN IMC CONDITIONS WITHOUT CLRNC OR BEACON CODE.

Narrative: I HAD BEEN VECTORED TO THE INBOUND LEG FOR AN NDB APCH TO SUGARLAND HOUSTON AT 2000 FT WHEN HOUSTON APCH CALLED A TA AT 10 O'CLOCK LESS THAN A MI. THE CEILING WAS 1700 FT BROKEN. A QUICK SCAN REVEALED NOTHING AND WHEN I RPTED NEGATIVE CONTACT THE CTLR SUGGESTED THE TFC MAY HAVE PASSED BEHIND ME. I LOOKED AT 9 O'CLOCK AND THERE WAS A C172 COMING DIRECTLY AT ME. HE PULLED UP AND TOWARDS MY TAIL AND I NOSED DOWN AND TO THE R. THERE WAS PROBABLY NO MORE THAN 50 YARDS BTWN US AT THE CLOSEST POINT. I CONTINUED THE APCH, ADVISED THE CTLR AT WHICH TIME HE TURNED ME OVER TO THE TWR AND I COMPLETED THE APCH. THE OTHER PLANE WAS BELOW THE CLASS B AIRSPACE AND DIDN'T HAVE VMC, NOR WAS HE SQUAWKING OR TALKING ON THE APCH END OF A BUSY ARPT, NOR DID HE PROPERLY YIELD TO THE ACFT ON HIS R. GUESS I'M JUST LUCKY.

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.