Medium large transport on approach and small aircraft in pattern had near midair collision.

Attributes
ACN	127744
Time
Date	198911
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hou
State Reference	TX
Altitude	msl bound lower : 1800 msl bound upper : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : hou tracon : n90
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	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	descent : approach
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 250
ASRS Report	127744
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

First officer flying ILS below cloud layer. Tower called possible traffic less than a mile then advised turn left to 360. First officer saw light twin aircraft ahead and level, pushed over to go below I observed light twin 3 seconds before he/she went over the top of our aircraft. We continued left turn for 360 and made an uneventful landing. Tower later said they were not talking to twin at the time but had counseled him on the ground.

Original NASA ASRS Text

Title: MLG ON APCH AND SMA IN PATTERN HAD NMAC.

Narrative: F/O FLYING ILS BELOW CLOUD LAYER. TWR CALLED POSSIBLE TFC LESS THAN A MILE THEN ADVISED TURN LEFT TO 360. F/O SAW LIGHT TWIN ACFT AHEAD AND LEVEL, PUSHED OVER TO GO BELOW I OBSERVED LIGHT TWIN 3 SECONDS BEFORE HE/SHE WENT OVER THE TOP OF OUR ACFT. WE CONTINUED LEFT TURN FOR 360 AND MADE AN UNEVENTFUL LNDG. TWR LATER SAID THEY WERE NOT TALKING TO TWIN AT THE TIME BUT HAD COUNSELED HIM ON THE GND.

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.