Air carrier on descent has TCASII RA. Begins evasive action, sights traffic (2 aircraft were called)...

Attributes
ACN	216443
Time
Date	199207
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bld airport : las
State Reference	NV
Altitude	msl bound lower : 10700 msl bound upper : 11700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	arrival other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 9000 flight time type : 4000
ASRS Report	216443
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 750 vertical : 500
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Descending on cresso arrival into las at approximately 10700 ft approach control started to inform of traffic at our 12 O'clock position at the same time we received TCASII TA immediately followed by a RA informing us to climb. The traffic was at 10400 ft VFR. We did not know whether the traffic was climbing or not so I informed approach that we were climbing to 12000 ft. The controller said we had other traffic at 10 O'clock at 12000 ft. At this point I picked up the 10 O'clock traffic and my first officer picked up the 12 O'clock traffic. We at this point visually had no conflict with either aircraft and at approximately 11700 ft we descended back to 11000 ft with the TCASII still indicating a climb.

Original NASA ASRS Text

Title: ACR ON DSCNT HAS TCASII RA. BEGINS EVASIVE ACTION, SIGHTS TFC (2 ACFT WERE CALLED).

Narrative: DSNDING ON CRESSO ARR INTO LAS AT APPROX 10700 FT APCH CTL STARTED TO INFORM OF TFC AT OUR 12 O'CLOCK POS AT THE SAME TIME WE RECEIVED TCASII TA IMMEDIATELY FOLLOWED BY A RA INFORMING US TO CLB. THE TFC WAS AT 10400 FT VFR. WE DID NOT KNOW WHETHER THE TFC WAS CLBING OR NOT SO I INFORMED APCH THAT WE WERE CLBING TO 12000 FT. THE CTLR SAID WE HAD OTHER TFC AT 10 O'CLOCK AT 12000 FT. AT THIS POINT I PICKED UP THE 10 O'CLOCK TFC AND MY FO PICKED UP THE 12 O'CLOCK TFC. WE AT THIS POINT VISUALLY HAD NO CONFLICT WITH EITHER ACFT AND AT APPROX 11700 FT WE DSNDED BACK TO 11000 FT WITH THE TCASII STILL INDICATING A CLB.

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.