Large transport has close proximity with aircraft on approach. Makes go around. TCASII RA.

Attributes
ACN	247542
Time
Date	199307
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cos
State Reference	CO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cos
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 7500
ASRS Report	247542
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 5000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We received a TCASII RA as we approached runway 35L cos. We complied with the TCASII directions and stopped our descent and began to climb. Prior to this, tower had informed us of an aircraft on downwind but we never got a visual on him. After taking evasive action we were out of position for a safe landing and elected to go around. We were vectored around for abut 15 mins and came back around and landed without further incident.

Original NASA ASRS Text

Title: LGT HAS CLOSE PROX WITH ACFT ON APCH. MAKES GAR. TCASII RA.

Narrative: WE RECEIVED A TCASII RA AS WE APCHED RWY 35L COS. WE COMPLIED WITH THE TCASII DIRECTIONS AND STOPPED OUR DSCNT AND BEGAN TO CLB. PRIOR TO THIS, TWR HAD INFORMED US OF AN ACFT ON DOWNWIND BUT WE NEVER GOT A VISUAL ON HIM. AFTER TAKING EVASIVE ACTION WE WERE OUT OF POS FOR A SAFE LNDG AND ELECTED TO GAR. WE WERE VECTORED AROUND FOR ABUT 15 MINS AND CAME BACK AROUND AND LANDED WITHOUT FURTHER INCIDENT.

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.