Flight crew of BE40 experience TCAS RA with small aircraft on approach to runway 12 at bzn.

Attributes
ACN	688496
Time
Date	200602
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bzn.airport
State Reference	MT
Altitude	msl single value : 7500
Environment
Flight Conditions	VMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bzn.tower
Operator	general aviation : corporate
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : bzn.tower
Make Model Name	Small Aircraft
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 3000
ASRS Report	688496
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	airspace violation : entry conflict : airborne critical
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : executed go around flight crew : took evasive action
Miss Distance	horizontal : 600 vertical : 600
Supplementary
Problem Areas	Flight Crew Human Performance Airport

Narrative:

While on a visual approach into runway 12 at bzn; we were on a left base leg joining a 5 mi final approach for runway 12. As we were descending for landing; I noticed traffic on our TCAS; and about that time; received a traffic alert from the TCAS unit. I mentioned the traffic to the tower clear who had already cleared us to land. The controller asked the aircraft in question to state her position from the field. She seemed as if she was not sure about her position. The controller at that point asks her to confirm that she was not on the approach corridor to runway 12 at bzn. She never answered the question which was asked of her; at least 3 times. She finally stated that she was going to proceed east of the field to get out of everybody's way. About that time we received an RA from our TCAS commanding us to climb. The first officer was flying at the time. I called for him to climb and to go around; which we did. The aircraft in question appeared to be a light high wing aircraft which was tracking right along the extended centerline of the approach corridor to runway 12.

Original NASA ASRS Text

Title: FLT CREW OF BE40 EXPERIENCE TCAS RA WITH SMA ON APCH TO RWY 12 AT BZN.

Narrative: WHILE ON A VISUAL APCH INTO RWY 12 AT BZN; WE WERE ON A L BASE LEG JOINING A 5 MI FINAL APCH FOR RWY 12. AS WE WERE DSNDING FOR LNDG; I NOTICED TFC ON OUR TCAS; AND ABOUT THAT TIME; RECEIVED A TFC ALERT FROM THE TCAS UNIT. I MENTIONED THE TFC TO THE TWR CLR WHO HAD ALREADY CLRED US TO LAND. THE CTLR ASKED THE ACFT IN QUESTION TO STATE HER POS FROM THE FIELD. SHE SEEMED AS IF SHE WAS NOT SURE ABOUT HER POS. THE CTLR AT THAT POINT ASKS HER TO CONFIRM THAT SHE WAS NOT ON THE APCH CORRIDOR TO RWY 12 AT BZN. SHE NEVER ANSWERED THE QUESTION WHICH WAS ASKED OF HER; AT LEAST 3 TIMES. SHE FINALLY STATED THAT SHE WAS GOING TO PROCEED E OF THE FIELD TO GET OUT OF EVERYBODY'S WAY. ABOUT THAT TIME WE RECEIVED AN RA FROM OUR TCAS COMMANDING US TO CLB. THE FO WAS FLYING AT THE TIME. I CALLED FOR HIM TO CLB AND TO GO AROUND; WHICH WE DID. THE ACFT IN QUESTION APPEARED TO BE A LIGHT HIGH WING ACFT WHICH WAS TRACKING RIGHT ALONG THE EXTENDED CTRLINE OF THE APCH CORRIDOR TO RWY 12.

Data retrieved from NASA's ASRS site as of January 2009 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.